EN-304-617.md

**Reference**: ENC-REQ-15 - Browser shall display clear, prominent warnings for certificate errors with appropriate risk communication

**Given**: A conformant browser with encryption capability (ENC-1 or higher)

**Task**: Verify that certificate error UI effectively warns users about man-in-the-middle attacks or compromised servers before they transmit sensitive data to untrusted connections. Clear, prominent warnings with appropriate risk communication prevent users from inadvertently trusting malicious certificates, while making bypass actions deliberately difficult discourages risky behavior that could expose credentials or personal information.

**Verification**:

1. Create test scenarios for various certificate errors:
   - Expired certificate
   - Untrusted CA
   - Hostname mismatch
   - Self-signed certificate
   - Revoked certificate
   - Weak signature algorithm (SHA-1)
   - Invalid certificate chain
2. Navigate to each error scenario and document browser UI response
3. Verify that warning messages clearly communicate security risk
4. Test that warnings are difficult to bypass (require explicit user action)
5. Evaluate warning message clarity for non-technical users
6. Test that technical details are available (certificate viewer)
7. Verify that bypass actions are clearly labeled with risk warnings
8. Test mobile and desktop warning UI differences
9. Verify that errors are logged in browser console
10. Certificate errors trigger full-page interstitial warnings
11. Warning messages clearly explain the security risk
12. Users should take explicit action to bypass (not easy clickthrough)
13. Technical details are accessible via "Advanced" or similar link
14. Certificate details can be viewed and inspected
15. Warning UI uses appropriate visual indicators (red, warning icons)
16. Bypass options are clearly labeled with risk warnings
17. Error types are distinguishable in UI messages
18. Console logs provide technical error details

**Pass Criteria**: All certificate errors display prominent warnings AND bypass requires explicit user acknowledgment of risk

**Fail Criteria**: Certificate errors can be bypassed silently OR warnings are unclear or easily dismissed

**Evidence**: Screenshots of warning UI for each error type, user testing feedback on clarity, console error logs, comparison with browser security UI guidelines

**References**:

- Google Transparency Report - HTTPS Security: https://transparencyreport.google.com/https/overview

### Assessment: ENC-REQ-16 (HTTPS-first mode)

**Reference**: ENC-REQ-16 - Browser shall implement HTTPS-first mode to automatically upgrade HTTP connections to HTTPS when available

**Given**: A conformant browser with encryption capability (ENC-2 or higher)

**Task**: Verify that HTTPS-first mode protects users from accidental insecure connections where attackers perform SSL-stripping attacks to downgrade HTTPS to HTTP, enabling interception of credentials and session tokens. Automatic HTTPS upgrade eliminates the window of vulnerability before secure connections are established, while user warnings for HTTP-only sites ensure informed consent before transmitting data over insecure channels.

**Verification**:

1. Enable HTTPS-first mode in browser settings
2. Navigate to HTTP URLs of sites that support HTTPS (http://example.com)
3. Verify that browser automatically upgrades to HTTPS
4. Test fallback behavior when HTTPS is unavailable:
   - Site doesn't support HTTPS
   - HTTPS connection fails/times out
   - Certificate error on HTTPS version
5. Verify user is prompted before loading HTTP-only sites
6. Test HTTPS upgrade for embedded resources (images, scripts, iframes)
7. Test interaction with HSTS and upgrade-insecure-requests
8. Measure performance impact of HTTPS upgrade attempts
9. Test HTTPS-first with different types of navigation (typed URL, bookmarks, links)
10. Verify browser remembers HTTP-only sites to avoid repeated upgrade attempts
11. HTTP URLs are automatically upgraded to HTTPS
12. Address bar shows HTTPS protocol after upgrade
13. Fallback to HTTP works with user consent when HTTPS unavailable
14. User is warned before loading HTTP-only sites
15. Browser remembers HTTP-only sites (cache/allowlist)
16. Embedded resources are also upgraded
17. HTTPS-first works alongside HSTS
18. Network panel shows upgrade attempts
19. Performance impact is minimal (parallel attempts)

**Pass Criteria**: HTTP connections are automatically upgraded to HTTPS when available AND users are warned before HTTP-only sites load

**Fail Criteria**: HTTP URLs are not upgraded OR no warnings for HTTP-only sites OR fallback doesn't work

**Evidence**: Network logs showing HTTP to HTTPS upgrades, address bar screenshots, warning dialog screenshots, performance measurements, browser settings showing HTTPS-first configuration

**References**:

- Chrome HTTPS-First Mode: https://blog.chromium.org/2021/07/increasing-https-adoption.html
- Firefox HTTPS-Only Mode: https://support.mozilla.org/en-US/kb/https-only-prefs
- HTTPS Upgrade Mechanisms: https://www.w3.org/TR/upgrade-insecure-requests/
- EFF HTTPS Everywhere: https://www.eff.org/https-everywhere
- OWASP Transport Layer Protection: https://cheatsheetseries.owasp.org/cheatsheets/Transport_Layer_Protection_Cheat_Sheet.html

### Assessment: ENC-REQ-17 (Certificate pinning bypass detection)

**Reference**: ENC-REQ-17 - Browser shall detect and prevent attempts to bypass certificate pinning protections

**Given**: A conformant browser with encryption capability (ENC-2 or higher)

**Task**: Verify that certificate pinning bypass detection prevents attackers or malware from installing rogue root certificates to perform man-in-the-middle attacks against pinned domains. Detecting bypass attempts protects browser vendor properties and high-security sites from SSL interception, while logging and user warnings ensure transparency when certificate validation is weakened by enterprise policies or security tools.

**Verification**:

1. Configure test environment with certificate pinning enabled
2. Attempt various bypass techniques:
   - Installing custom root CA certificates
   - Using SSL/TLS interception proxies (corporate MITM)
   - Modifying browser certificate store
   - Using browser extensions to disable pinning
   - Command-line flags to disable certificate validation
3. Test browser's built-in static pins (Google, Mozilla properties)
4. Verify that pin bypass attempts are detected and logged
5. Test enterprise policy controls for pinning exceptions
6. Verify user notifications for certificate store modifications
7. Test that developer tools can't silently bypass pinning
8. Examine browser internal state for pin enforcement
9. Test interaction between pin bypass and security indicators
10. Static pins for built-in domains cannot be bypassed
11. Custom root CA installation triggers user warnings
12. SSL interception is detected and indicated in UI
13. Browser logs pin bypass attempts
14. Certificate store modifications are visible to users
15. Enterprise policies can override pins with explicit configuration
16. Developer tools respect pinning (or show clear bypass warnings)
17. Security indicators reflect weakened security when pins bypassed
18. Console logs show certificate validation details

**Pass Criteria**: Static certificate pins cannot be bypassed without explicit user/admin action AND pin bypass attempts are logged and indicated

**Fail Criteria**: Pins can be silently bypassed OR no indication when certificate validation is weakened

**Evidence**: Console logs showing pin enforcement, certificate store modification warnings, test results from bypass attempts, enterprise policy documentation, security indicator screenshots

**References**:

- Chrome Certificate Pinning: https://www.chromium.org/Home/chromium-security/education/tls/
- OWASP Certificate Pinning: https://owasp.org/www-community/controls/Certificate_and_Public_Key_Pinning
- SSL Interception Detection: https://blog.mozilla.org/security/2015/04/30/deprecating-non-secure-http/
- Mozilla Pin Override: https://wiki.mozilla.org/SecurityEngineering/Public_Key_Pinning

### Assessment: ENC-REQ-18 (TLS downgrade protection)

**Reference**: ENC-REQ-18 - Browser shall implement protections against TLS version and cipher suite downgrade attacks

**Given**: A conformant browser with encryption capability (ENC-1 or higher)

**Task**: Verify that TLS downgrade protection prevents man-in-the-middle attackers from forcing browsers to use older TLS versions or weaker cipher suites with known vulnerabilities like POODLE or BEAST. Downgrade protection ensures that even when attackers intercept and modify handshake messages, the browser detects the manipulation and aborts the connection rather than proceeding with weakened cryptographic parameters.

**Verification**:

1. Set up test environment capable of simulating man-in-the-middle attacks
2. Configure server supporting TLS 1.3 and TLS 1.2
3. Attempt to force downgrade from TLS 1.3 to TLS 1.2 by manipulating ClientHello
4. Test TLS_FALLBACK_SCSV signaling value (RFC 7507)
5. Attempt downgrade attacks during connection:
   - Version rollback to older TLS versions
   - Cipher suite downgrade to weaker algorithms
   - Extension stripping attacks
6. Verify browser detects and rejects downgrade attempts
7. Test that Finished message MAC includes all handshake messages
8. Verify TLS 1.3 downgrade protection sentinel values in ServerHello.random
9. Test protection against truncation attacks
10. Browser signals maximum supported TLS version correctly
11. TLS_FALLBACK_SCSV is included in fallback connections
12. Version rollback attacks are detected and connection aborted
13. Cipher suite downgrade attempts trigger handshake failure
14. Browser validates ServerHello.random for downgrade sentinels
15. Extension stripping is detected through transcript hash validation
16. Finished message properly authenticates handshake
17. Console shows error messages for detected downgrade attempts
18. Connection fails securely rather than completing with weakened security

**Pass Criteria**: All TLS downgrade attempts are detected AND connections fail rather than proceed with weakened security

**Fail Criteria**: Any downgrade attack succeeds OR browser accepts weakened connection parameters

**Evidence**: Packet captures showing downgrade attempts and rejection, Wireshark showing TLS_FALLBACK_SCSV, console error logs, test scripts demonstrating attack attempts

**References**:

- RFC 7507 - TLS Fallback SCSV: https://datatracker.ietf.org/doc/html/rfc7507
- RFC 8446 - TLS 1.3 Downgrade Protection: https://datatracker.ietf.org/doc/html/rfc8446#section-4.1.3
- POODLE Attack and Downgrade Prevention: https://www.openssl.org/~bodo/ssl-poodle.pdf
- Chrome TLS Implementation: https://www.chromium.org/Home/chromium-security/education/tls/

### Assessment: ENC-REQ-19 (Legacy crypto deprecation)

**Reference**: ENC-REQ-19 - Browser shall deprecate and remove support for legacy cryptographic algorithms and protocols

**Given**: A conformant browser with encryption capability (ENC-1 or higher)

**Task**: Verify that legacy crypto deprecation prevents attackers from exploiting known cryptographic weaknesses in outdated algorithms like SHA-1 collision attacks, RC4 biases, or short RSA key factorization. Progressive deprecation with clear timelines gives organizations migration paths while ensuring browsers eventually reject severely compromised cryptography that no longer provides meaningful security guarantees.

**Verification**:

1. Test browser behavior with legacy cryptographic elements:
   - TLS 1.0 and TLS 1.1 protocols
   - SHA-1 certificates
   - 1024-bit RSA keys
   - MD5-based signatures
   - RC4 cipher suite
   - CBC-mode cipher suites
   - DSA certificates
2. Verify that legacy protocols/algorithms are rejected or trigger warnings
3. Test deprecation timeline (when were features removed)
4. Verify that browser update notes document deprecated features
5. Test enterprise policy overrides for legacy support (temporary exceptions)
6. Check browser developer documentation for deprecation roadmap
7. Test fallback behavior when modern crypto unavailable
8. Verify that critical errors can't be bypassed for severely deprecated crypto
9. TLS 1.0 and 1.1 connections are rejected or show warnings
10. SHA-1 certificates trigger security errors
11. 1024-bit RSA keys are rejected
12. MD5 and RC4 are completely disabled
13. Legacy crypto rejections show clear error messages
14. Browser documentation lists deprecated features with timelines
15. Enterprise policies can temporarily enable legacy support (if necessary)
16. No silent fallback to insecure legacy protocols
17. Console logs indicate when legacy crypto is encountered

**Pass Criteria**: All severely deprecated cryptographic elements are rejected AND users are warned about moderately deprecated features

**Fail Criteria**: Legacy crypto is accepted without warnings OR deprecated features work without indication

**Evidence**: Connection error screenshots for legacy servers, browser release notes documenting deprecations, console error logs, test results across browser versions showing deprecation timeline

**References**:

- Chrome Deprecation Timeline: https://www.chromium.org/Home/chromium-security/education/tls/
- Mozilla Security Roadmap: https://wiki.mozilla.org/Security/Server_Side_TLS
- RFC 8996 - Deprecating TLS 1.0 and TLS 1.1: https://datatracker.ietf.org/doc/html/rfc8996
- CA/B Forum - SHA-1 Deprecation: https://cabforum.org/2014/10/16/ballot-118-sha-1-sunset/
- NIST Cryptographic Algorithm Deprecation: https://csrc.nist.gov/projects/hash-functions

### Assessment: ENC-REQ-20 (Cryptographic key isolation)

**Reference**: ENC-REQ-20 - Browser shall isolate cryptographic keys and prevent cross-origin key access

**Given**: A conformant browser with encryption capability (ENC-2 or higher)

**Task**: Verify that cryptographic key isolation enforces same-origin policy for Web Crypto API keys, preventing malicious cross-origin scripts from accessing or exfiltrating cryptographic keys generated by other origins. Key isolation ensures that even if an attacker compromises one origin, they cannot steal cryptographic keys belonging to other origins to impersonate users or decrypt sensitive data protected by those keys.

**Verification**:

1. Create test scenarios with Web Crypto API key generation on different origins
2. Generate cryptographic keys on https://origin-a.com using Web Crypto API
3. Attempt to access keys from https://origin-b.com
4. Test IndexedDB key storage isolation across origins
5. Verify that keys marked as non-extractable cannot be extracted
6. Test key export restrictions based on key usage
7. Test that key handles cannot be passed between origins via postMessage
8. Verify key isolation in browser's internal key storage
9. Test hardware-backed key storage (if available, e.g., WebAuthn)
10. Test key isolation for different user profiles/contexts
11. Keys generated on one origin cannot be accessed from another origin
12. IndexedDB key storage respects same-origin policy
13. Non-extractable keys cannot be exported or extracted
14. Key usage restrictions are enforced (keys can't be used for unauthorized operations)
15. Key handles are opaque and cannot be transferred cross-origin
16. Browser internal key storage is isolated per origin
17. Hardware-backed keys are protected by platform security
18. Different user profiles have separate key storage
19. Attempts to access cross-origin keys throw SecurityError

**Pass Criteria**: Cryptographic keys are strictly isolated by origin AND non-extractable keys cannot be exported

**Fail Criteria**: Keys can be accessed across origins OR key usage restrictions can be bypassed

**Evidence**: Console logs showing SecurityError for cross-origin key access, test code demonstrating isolation, browser internal state showing key storage separation, WebAuthn test results

**References**:

- W3C Web Cryptography API - Key Storage: https://www.w3.org/TR/WebCryptoAPI/#concepts-key-storage
- MDN CryptoKey: https://developer.mozilla.org/en-US/docs/Web/API/CryptoKey
- Chrome Web Crypto Key Isolation: https://chromium.googlesource.com/chromium/src/+/master/components/webcrypto/README.md
- OWASP Key Management Cheat Sheet: https://cheatsheetseries.owasp.org/cheatsheets/Key_Management_Cheat_Sheet.html
- WebAuthn Specification - Credential Storage: https://www.w3.org/TR/webauthn-2/#credential-storage

### Assessment: ENC-REQ-21 (Certificate store security)

**Reference**: ENC-REQ-21 - Browser shall maintain secure certificate store with integrity protection and auditing

**Given**: A conformant browser with encryption capability (ENC-1 or higher)

**Task**: Verify that certificate store security prevents attackers from installing rogue root certificates to enable man-in-the-middle attacks against all TLS connections. Protected certificate stores with integrity checking and audit trails detect unauthorized modifications, while requiring explicit user consent for root CA changes prevents malware from silently compromising the foundation of TLS trust.

**Verification**:

1. Examine browser's certificate store location and access controls
2. Test that certificate store is protected with appropriate file system permissions
3. Attempt to modify certificate store while browser is running
4. Verify that certificate store changes are logged/auditable
5. Test root CA certificate management:
   - View installed root certificates
   - Add custom root CA (with user consent)
   - Remove root CA (with user consent)
   - Verify certificate trust settings
6. Test that system certificate store is used appropriately
7. Verify that enterprise-managed certificates are clearly indicated
8. Test certificate store integrity verification mechanisms
9. Test that certificate store updates are secure and authenticated
10. Verify user notifications for certificate store modifications
11. Certificate store files have restrictive permissions (not world-readable)
12. Certificate store cannot be modified without appropriate privileges
13. Browser detects and handles certificate store corruption
14. Root CA additions/removals require explicit user consent
15. Certificate store UI shows all installed root certificates
16. System certificate store integration works correctly
17. Enterprise-managed certificates are visibly marked
18. Certificate store modifications are logged
19. Users are notified of certificate store changes
20. Certificate store updates are signed and verified

**Pass Criteria**: Certificate store is protected with appropriate access controls AND modifications require user consent and are logged

**Fail Criteria**: Certificate store can be modified without user knowledge OR no audit trail for modifications

**Evidence**: File system permission analysis, certificate store UI screenshots, audit log samples, test results from modification attempts, enterprise policy documentation

**References**:

- Mozilla Root Store Program: https://www.mozilla.org/en-US/about/governance/policies/security-group/certs/
- Chrome Root Store: https://chromium.googlesource.com/chromium/src/+/main/net/data/ssl/chrome_root_store/
- Microsoft Trusted Root Program: https://learn.microsoft.com/en-us/security/trusted-root/program-requirements
- Apple Root Certificate Program: https://www.apple.com/certificateauthority/ca_program.html
- OWASP Certificate Management: https://cheatsheetseries.owasp.org/cheatsheets/Transport_Layer_Protection_Cheat_Sheet.html#certificate-and-public-key-pinning

## 6.4 Security Event Logging Assessments

This section covers assessment procedures for requirements LOG-REQ-1 through LOG-REQ-20, addressing security event logging, audit trails, privacy-preserving telemetry, log retention, and security monitoring capabilities.

### Assessment: LOG-REQ-1 (Security event logging)

**Reference**: LOG-REQ-1 - Browser shall implement comprehensive security event logging for security-relevant events

**Given**: A conformant browser with LOG-1 or higher capability

**Task**: Verify that comprehensive security event logging enables detection and investigation of attacks, providing audit trails for security incidents like XSS attempts, CSP violations, and CORS bypasses. Complete logging with timestamps, origins, and outcomes allows security teams to identify attack patterns, correlate events across multiple targets, and respond to threats effectively while supporting compliance with security monitoring requirements.

**Verification**:

1. Configure the browser to enable security event logging in developer or enterprise mode
2. Access the browser's internal logging interfaces (chrome://net-internals/#events, about:networking, or equivalent)
3. Navigate to a test page that triggers multiple security events (mixed content, certificate errors, XSS attempts)
4. Attempt cross-origin requests that violate CORS policies
5. Load test pages with Content Security Policy violations
6. Trigger sandbox violations by attempting to access restricted APIs
7. Review the logged events to verify all security-relevant actions are captured
8. Export the security event log to verify it contains timestamps, event types, origins, and outcomes
9. Verify that security events include sufficient context for investigation (URL, origin, error type, timestamp)
10. Test that security events persist across browser restarts if configured for persistent logging
11. All security policy violations are logged with accurate timestamps
12. Logs include sufficient context to identify the origin and nature of security events
13. Security events include: CSP violations, CORS failures, mixed content blocks, certificate errors, sandbox violations
14. Logs distinguish between blocked and allowed actions with clear outcomes
15. Event log format is structured and machine-readable (JSON or similar)
16. Logs can be exported for analysis or forwarding to external systems

**Pass Criteria**: All tested security events are captured in logs with complete context (timestamp, origin, event type, outcome) AND logs are exportable in a structured format

**Fail Criteria**: Any security event fails to be logged OR logs lack critical context (timestamp, origin, or outcome) OR logs are not exportable

**Evidence**: Screenshots of security event logs showing various event types, exported log files in JSON/structured format, video recordings of security events being triggered and logged, comparison matrices showing event coverage

**References**:

- W3C Reporting API: https://www.w3.org/TR/reporting-1/
- OWASP Logging Cheat Sheet: https://cheatsheetseries.owasp.org/cheatsheets/Logging_Cheat_Sheet.html
- NIST SP 800-92 Guide to Computer Security Log Management: https://csrc.nist.gov/publications/detail/sp/800-92/final

### Assessment: LOG-REQ-2 (Certificate error logging)

**Reference**: LOG-REQ-2 - Browser shall log all certificate validation failures with detailed error information

**Given**: A conformant browser with LOG-1 or higher capability

**Task**: Verify that certificate error logging enables detection of man-in-the-middle attacks and certificate misconfigurations, providing detailed information for security investigations. Comprehensive certificate logs with chain details, error types, and revocation status help identify patterns of TLS interception, rogue certificates, or systematic validation failures that could indicate ongoing attacks against users or infrastructure.

**Verification**:

1. Set up a test web server with various certificate issues (expired, self-signed, wrong hostname, revoked)
2. Navigate to https://expired.badssl.com/ and verify the certificate error is logged
3. Navigate to https://wrong.host.badssl.com/ and verify hostname mismatch is logged
4. Navigate to https://self-signed.badssl.com/ and verify self-signed certificate is logged
5. Navigate to https://revoked.badssl.com/ and verify revocation status is logged
6. Review the certificate error logs to verify they include: certificate chain, error type, validation date, origin
7. Test certificate pinning failures by creating a pinning policy and violating it
8. Verify that certificate transparency failures are logged when CT enforcement is enabled
9. Test that HSTS violations involving certificates are properly logged
10. All certificate validation failures are logged with specific error codes
11. Logs include certificate subject, issuer, validity period, and error reason
12. Certificate chain information is captured in logs
13. Revocation check results (OCSP/CRL) are included
14. Certificate pinning violations are logged separately
15. Logs distinguish between hard failures (blocked) and soft failures (warnings)

**Pass Criteria**: All certificate validation failures are logged with complete certificate details AND error reasons are specific and actionable

**Fail Criteria**: Any certificate error is not logged OR logs lack certificate details OR error reasons are generic/unhelpful

**Evidence**: Certificate error log entries showing various failure types, screenshots of BadSSL.com test results with corresponding logs, certificate chain dumps from logs, network traces showing certificate validation process

**References**:

- RFC 5280 X.509 Certificate Validation: https://www.rfc-editor.org/rfc/rfc5280
- Certificate Transparency RFC 6962: https://www.rfc-editor.org/rfc/rfc6962
- Chrome Certificate Error Logging: https://www.chromium.org/Home/chromium-security/certificate-transparency/
- OWASP Transport Layer Protection Cheat Sheet: https://cheatsheetseries.owasp.org/cheatsheets/Transport_Layer_Protection_Cheat_Sheet.html

### Assessment: LOG-REQ-3 (Extension security events)

**Reference**: LOG-REQ-3 - Browser shall log extension-related security events including installation, permission changes, and security violations

**Given**: A conformant browser with EXT-1 or higher capability and LOG-1 or higher capability

**Task**: Verify that extension security event logging enables detection of malicious extensions that abuse permissions, access sensitive APIs without authorization, or attempt to bypass security policies. Detailed extension logs with lifecycle events, permission changes, and security violations help identify compromised or rogue extensions that could exfiltrate data, inject malicious scripts, or escalate privileges beyond their declared capabilities.

**Verification**:

1. Install a test extension and verify the installation event is logged with extension ID, name, and permissions
2. Modify extension permissions and verify permission changes are logged
3. Create a test extension that attempts to access APIs without proper permissions
4. Trigger extension content script injection and verify it's logged
5. Test extension network requests to verify they are logged separately from normal browsing
6. Uninstall the extension and verify the removal event is logged
7. Test developer mode extension loading and verify it's flagged in logs
8. Simulate an extension attempting to bypass CSP and verify the violation is logged
9. Test extension update events and verify version changes are logged
10. Extension lifecycle events (install, update, uninstall) are logged with metadata
11. Permission requests and grants are logged with timestamp and user action
12. Extension security violations are logged separately from web page violations
13. Extension API access attempts are logged with success/failure status
14. Developer mode extensions are clearly marked in logs
15. Extension-injected content is distinguishable in logs from page content

**Pass Criteria**: All extension lifecycle and security events are logged with complete metadata AND extension actions are distinguishable from page actions

**Fail Criteria**: Any extension security event is not logged OR extension actions cannot be distinguished from page actions OR permission changes are not logged

**Evidence**: Extension event logs showing lifecycle events, permission change logs, screenshots of extension security violations with corresponding log entries, comparison of extension vs. page event logs

**References**:

- Chrome Extension Security Architecture: https://developer.chrome.com/docs/extensions/mv3/security/
- WebExtensions API Security: https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API
- Extension Permission Model: https://www.chromium.org/Home/chromium-security/extension-content-script-fetches/
- OWASP Browser Extension Security: https://owasp.org/www-community/vulnerabilities/Unsafe_Mobile_Code

### Assessment: LOG-REQ-4 (CSP violation reporting)

**Reference**: LOG-REQ-4 - Browser shall implement Content Security Policy violation reporting and logging

**Given**: A conformant browser with LOG-1 or higher capability

**Task**: Verify that CSP violation reporting enables detection of XSS attempts and policy bypasses, providing actionable intelligence about attacks targeting web applications. Automated reporting with complete violation context allows security teams to identify attack vectors, adjust CSP policies, and detect systematic attempts to inject malicious scripts or load unauthorized resources that could compromise user data.

**Verification**:

1. Create a test page with a strict CSP policy: `Content-Security-Policy: default-src 'self'; report-uri /csp-report`
2. Attempt to load external scripts that violate the CSP policy
3. Verify CSP violation reports are sent to the report-uri endpoint
4. Check browser console for CSP violation messages
5. Test inline script violations and verify they are reported
6. Test eval() violations and verify they are blocked and reported
7. Configure CSP with report-to directive and Report-To header for modern reporting
8. Test CSP reporting with report-only mode using Content-Security-Policy-Report-Only header
9. Verify that violation reports include: violated-directive, blocked-uri, source-file, line-number
10. All CSP violations trigger console warnings in developer tools
11. Violation reports are sent to configured report-uri endpoints
12. Reports include complete context: violated directive, blocked resource, source location
13. Report-only mode generates reports without blocking resources
14. Modern Reporting API (report-to) is supported for CSP reporting
15. Reports are generated in standard JSON format per W3C specification

**Pass Criteria**: All CSP violations are reported to configured endpoints AND console warnings are displayed AND reports contain complete violation context

**Fail Criteria**: Any CSP violation is not reported OR reports lack critical information OR report-uri/report-to mechanisms don't function

**Evidence**: CSP violation reports in JSON format, server logs showing received reports, browser console screenshots with CSP warnings, network traces showing report transmission, comparison of report-only vs. enforce mode

**References**:

- Content Security Policy Level 3: https://www.w3.org/TR/CSP3/
- CSP Violation Reports: https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP#violation_reports
- W3C Reporting API: https://www.w3.org/TR/reporting-1/
- CSP Evaluator Tool: https://csp-evaluator.withgoogle.com/

### Assessment: LOG-REQ-5 (Network Error Logging - NEL)

**Reference**: LOG-REQ-5 - Browser shall support Network Error Logging (NEL) for monitoring network failures

**Given**: A conformant browser with LOG-1 or higher capability

**Task**: Verify that Network Error Logging enables detection of network-level attacks and infrastructure issues, monitoring connection failures that could indicate DNS hijacking, TLS interception, or targeted denial of service. NEL provides visibility into network failures that occur before HTTP layer, helping identify systematic attacks, CDN failures, or connectivity issues affecting user security and availability.

**Verification**:

1. Set up a test server that sends NEL policy header: `NEL: {"report_to":"network-errors","max_age":86400,"success_fraction":0.1,"failure_fraction":1.0}`
2. Configure Report-To header: `Report-To: {"group":"network-errors","max_age":86400,"endpoints":[{"url":"https://collector.example.com/nel"}]}`
3. Trigger DNS resolution failures by attempting to navigate to non-existent domains
4. Trigger connection timeout errors by connecting to a filtered port
5. Trigger TLS handshake failures by using misconfigured certificates
6. Trigger HTTP protocol errors by sending malformed responses
7. Verify that NEL reports are generated and sent to the configured endpoint
8. Check that success sampling works correctly (success_fraction parameter)
9. Verify NEL reports include: type, url, server-ip, protocol, status-code, elapsed-time, phase
10. NEL policy is correctly parsed from HTTP headers
11. Network failures trigger NEL report generation
12. Reports are sent to configured endpoints asynchronously
13. Sampling fractions are respected for success/failure events
14. NEL reports include detailed failure context (phase, type, status)
15. Reports distinguish between DNS, connection, TLS, and HTTP errors
16. NEL reports are batched and sent efficiently

**Pass Criteria**: NEL policy is respected AND all configured failure types generate reports AND reports include complete network error context

**Fail Criteria**: NEL policy is ignored OR network failures don't generate reports OR reports lack critical failure information

**Evidence**: NEL policy headers from server, collected NEL reports in JSON format, server logs showing received reports, network traces demonstrating various failure types, NEL report timing analysis

**References**:

- Network Error Logging Specification: https://www.w3.org/TR/network-error-logging/
- Reporting API Specification: https://www.w3.org/TR/reporting-1/
- NEL Deployment Guide: https://developers.google.com/web/updates/2018/09/reportingapi
- MDN Network Error Logging: https://developer.mozilla.org/en-US/docs/Web/HTTP/Network_Error_Logging

### Assessment: LOG-REQ-6 (Crash reporting)

**Reference**: LOG-REQ-6 - Browser shall implement privacy-preserving crash reporting with user consent

**Given**: A conformant browser with LOG-1 or higher capability

**Task**: Verify that privacy-preserving crash reporting enables browser vendors to identify and fix security vulnerabilities without exposing user browsing history or personal information. User consent requirements ensure transparency while crash report anonymization prevents data leakage, balancing the need for diagnostic information to address exploitable bugs with user privacy rights and regulatory compliance.

**Verification**:

1. Review browser settings for crash reporting consent options
2. Enable crash reporting and verify user consent is obtained before activation
3. Force a controlled browser crash using debugging tools or crash test pages
4. Verify a crash report is generated locally
5. Check that crash reports are anonymized and don't contain browsing history or personal data
6. Verify crash reports include: crash signature, stack trace (symbolicated), browser version, OS version
7. Test that crash reports are only uploaded after user consent
8. Verify users can view and delete crash reports before submission
9. Test opt-out functionality and verify no reports are sent when opted out
10. Verify renderer process crashes are reported separately from browser process crashes
11. User consent is required before crash reporting is enabled
12. Crash reports are generated for browser and renderer crashes
13. Reports include technical diagnostics (stack traces, crash signatures) but no personal data
14. Users can review crash reports before submission
15. Crash reporting can be disabled and re-enabled in settings
16. Crash reports are transmitted securely (HTTPS) to vendor endpoints
17. Local crash report storage has size/age limits to prevent disk exhaustion

**Pass Criteria**: User consent is obtained before crash reporting AND crash reports exclude personal data AND users can review/delete reports

**Fail Criteria**: Crash reports are sent without consent OR reports contain personal/browsing data OR users cannot control crash reporting

**Evidence**: Crash report consent dialogs, sanitized crash reports showing included data, settings screenshots showing crash reporting controls, privacy policy documentation, crash report upload network traces

**References**:

- Breakpad Crash Reporting: https://chromium.googlesource.com/breakpad/breakpad/
- Firefox Crash Reporter: https://support.mozilla.org/en-US/kb/mozilla-crash-reporter
- GDPR Crash Reporting Compliance: https://gdpr.eu/what-is-gdpr/

### Assessment: LOG-REQ-7 (Log data minimization)

**Reference**: LOG-REQ-7 - Browser shall minimize data collection in logs, collecting only information necessary for security purposes

**Given**: A conformant browser with LOG-1 or higher capability

**Task**: Verify that log data minimization prevents excessive collection of personal information, balancing security monitoring needs with privacy rights and regulatory compliance. Collecting only necessary security-relevant data with automatic retention limits reduces the risk of data breaches exposing user browsing history, credentials, or sensitive personal information while still enabling effective threat detection and incident response.

**Verification**:

1. Review all log categories to identify what data is collected (security events, network, performance, etc.)
2. Examine security event logs to verify they don't contain unnecessary personal information
3. Check that URLs in logs are sanitized (query parameters removed or hashed)
4. Verify that user credentials are never logged, even in error conditions
5. Test that cookies and authentication tokens are redacted from network logs
6. Review crash reports to ensure they exclude browsing history and form data
7. Verify that IP addresses in logs are anonymized (last octet removed) or hashed
8. Test that logs have automatic retention limits (time-based and size-based)
9. Verify that sensitive form fields (passwords, credit cards) are never logged
10. Check that telemetry aggregates data rather than logging individual user actions
11. Logs contain only security-relevant events, not general browsing activity
12. Personal identifiable information (PII) is redacted or hashed in logs
13. URL parameters that may contain session tokens are removed
14. Credentials, cookies, and authentication headers are never logged
15. IP addresses are anonymized or removed from logs
16. Logs automatically expire based on retention policies
17. Form input data is excluded from all logs
18. Aggregated metrics replace individual event logging where possible

**Pass Criteria**: All logs demonstrate data minimization (no unnecessary PII) AND sensitive data is consistently redacted AND retention limits are enforced

**Fail Criteria**: Logs contain unnecessary PII OR credentials/tokens appear in logs OR no retention limits exist

**Evidence**: Log samples showing redaction of sensitive data, privacy analysis of log contents, retention policy documentation, comparison of logged vs. available data showing minimization, code review of logging implementations

**References**:

- OWASP Logging Cheat Sheet - Data Sanitization: https://cheatsheetseries.owasp.org/cheatsheets/Logging_Cheat_Sheet.html
- NIST Privacy Framework: https://www.nist.gov/privacy-framework
- W3C Privacy Principles: https://www.w3.org/TR/privacy-principles/

### Assessment: LOG-REQ-8 (Log anonymization)

**Reference**: LOG-REQ-8 - Browser shall implement anonymization techniques for logs that require user-related data

**Given**: A conformant browser with LOG-1 or higher capability

**Task**: Verify that log anonymization prevents re-identification of users from telemetry data, protecting user privacy while maintaining the ability to detect security incidents and diagnose technical issues. Proper anonymization defends against correlation attacks where adversaries combine multiple log entries to de-anonymize users, as well as against data breaches where stolen logs could reveal sensitive user information.

**Verification**:

1. Review telemetry logs to identify user-related fields (user ID, device ID, session ID)
2. Verify that user identifiers are hashed with secure cryptographic hash functions
3. Check that hash salts are rotated periodically to prevent correlation
4. Test that IP addresses are anonymized using techniques like IP truncation or hashing
5. Verify that timestamps are rounded to reduce precision (hour or day level) where appropriate
6. Test that geographic data is generalized (city level rather than GPS coordinates)
7. Review aggregation techniques to ensure k-anonymity (minimum group size) is maintained
8. Verify differential privacy techniques are applied to statistical queries on logs
9. Test that user fingerprints cannot be reconstructed from anonymized logs
10. Check that pseudonymous identifiers change across different log contexts
11. User identifiers are consistently hashed with strong cryptographic algorithms
12. Hash salts are documented and rotated on a defined schedule
13. IP addresses are truncated or hashed before storage
14. Timestamps are appropriately rounded to reduce granularity
15. Geographic data is generalized to prevent precise location tracking
16. Aggregated data maintains k-anonymity with k >= 5
17. Differential privacy noise is added to prevent individual identification
18. Cross-log correlation attacks are prevented through identifier rotation

**Pass Criteria**: All user-related data is anonymized using documented techniques AND re-identification is demonstrably prevented AND k-anonymity is maintained

**Fail Criteria**: User data is logged in plaintext OR anonymization is reversible OR re-identification is possible through correlation

**Evidence**: Anonymized log samples with hash values, salt rotation policy documentation, privacy analysis showing k-anonymity, differential privacy parameters, re-identification attack test results (negative results expected)

**References**:

- Differential Privacy: https://www.microsoft.com/en-us/research/publication/differential-privacy/
- K-Anonymity Model: https://epic.org/privacy/reidentification/Sweeney_Article.pdf
- NIST De-Identification Guidelines: https://nvlpubs.nist.gov/nistpubs/ir/2015/NIST.IR.8053.pdf
- Google's Privacy-Preserving Techniques: https://policies.google.com/technologies/anonymization

### Assessment: LOG-REQ-9 (User consent for telemetry)

**Reference**: LOG-REQ-9 - Browser shall obtain explicit user consent before collecting and transmitting telemetry data

**Given**: A conformant browser with LOG-1 or higher capability

**Task**: Verify that explicit user consent for telemetry protects user privacy rights and complies with data protection regulations including GDPR and CPRA. Without proper consent mechanisms, browsers may violate privacy laws by collecting personal data without permission, and users are deprived of control over their information. Consent must be freely given, specific, informed, and revocable to meet legal and ethical standards.

**Verification**:

1. Perform a fresh installation of the browser and observe the first-run experience
2. Verify that a clear consent prompt is displayed for telemetry collection
3. Check that the consent prompt explains what data is collected and why
4. Verify users can decline telemetry without affecting core browser functionality
5. Test that declining telemetry prevents all non-essential data collection
6. Navigate to browser settings and verify telemetry preferences are accessible
7. Verify users can change their consent choice at any time in settings
8. Test that telemetry settings are granular (separate controls for crash reports, usage stats, etc.)
9. Verify that consent choices persist across browser sessions and updates
10. Check that consent is re-requested when telemetry data types or purposes change significantly
11. First-run consent prompt is clear, prominent, and explains data collection
12. Users can freely choose to accept or decline without dark patterns
13. Declining telemetry doesn't degrade core browser functionality
14. Telemetry settings are easily accessible in preferences/settings
15. Consent choices are persistent and respected across updates
16. Granular controls allow users to consent to specific telemetry types
17. Changes to data collection practices trigger new consent requests
18. Consent records are maintained for compliance auditing

**Pass Criteria**: Explicit consent is obtained before telemetry collection AND users can easily manage consent preferences AND browser functions normally when telemetry is declined

**Fail Criteria**: Telemetry starts without consent OR consent cannot be withdrawn OR declining breaks browser functionality OR dark patterns are used

**Evidence**: Screenshots of consent prompts and settings UI, network traces showing no telemetry when declined, functional testing with telemetry disabled, consent flow video recordings, privacy policy documentation

**References**:

- GDPR Consent Requirements: https://gdpr.eu/gdpr-consent-requirements/
- ePrivacy Directive: https://eur-lex.europa.eu/legal-content/EN/ALL/?uri=CELEX:32002L0058
- W3C Privacy Principles - User Control: https://www.w3.org/TR/privacy-principles/#user-control

### Assessment: LOG-REQ-10 (Secure log transmission)

**Reference**: LOG-REQ-10 - Browser shall transmit logs securely using encrypted channels with certificate validation

**Given**: A conformant browser with LOG-1 or higher capability

**Task**: Verify that secure log transmission prevents interception or modification of telemetry and crash reports in transit, protecting sensitive diagnostic data from network attackers. Without encrypted transmission and certificate validation, adversaries can eavesdrop on log data to gain insights into user behavior, browser vulnerabilities, or enterprise configurations, or perform man-in-the-middle attacks to inject false telemetry data.

**Verification**:

1. Enable telemetry and crash reporting in browser settings
2. Trigger events that generate log transmissions (crash, CSP violation, NEL error)
3. Use network monitoring tools (Wireshark, mitmproxy) to capture log transmission traffic
4. Verify all log transmissions use HTTPS (TLS 1.2 or higher)
5. Verify certificate validation is performed for log collection endpoints
6. Test that log transmission fails if the server certificate is invalid
7. Check that certificate pinning is used for log collection endpoints if available
8. Verify log data is not transmitted over insecure protocols (HTTP, FTP, unencrypted sockets)
9. Test that log transmission includes retry logic for temporary network failures
10. Verify log transmission is batched and rate-limited to prevent network abuse
11. All log transmissions use TLS 1.2 or higher encryption
12. Certificate validation is enforced for log collection servers
13. Invalid or expired certificates prevent log transmission
14. Certificate pinning is applied to log endpoints where supported
15. No log data is ever transmitted in plaintext
16. Connection failures trigger retry with exponential backoff
17. Log batching reduces network overhead and improves privacy
18. Rate limiting prevents log transmission from consuming excessive bandwidth

**Pass Criteria**: All log transmissions use TLS 1.2+ with certificate validation AND transmission fails for invalid certificates AND no plaintext transmission occurs

**Fail Criteria**: Any logs transmitted over plaintext protocols OR certificate validation is not enforced OR invalid certificates are accepted

**Evidence**: Network packet captures showing TLS-encrypted log traffic, certificate validation test results, failed transmission logs for invalid certificates, retry mechanism testing, bandwidth usage analysis

**References**:

- TLS 1.3 Specification RFC 8446: https://www.rfc-editor.org/rfc/rfc8446
- Certificate Pinning: https://owasp.org/www-community/controls/Certificate_and_Public_Key_Pinning
- OWASP Transport Layer Protection: https://cheatsheetseries.owasp.org/cheatsheets/Transport_Layer_Protection_Cheat_Sheet.html
- Mozilla TLS Configuration: https://wiki.mozilla.org/Security/Server_Side_TLS

### Assessment: LOG-REQ-11 (Log integrity protection)

**Reference**: LOG-REQ-11 - Browser shall implement integrity protection for locally stored logs to prevent tampering

**Given**: A conformant browser with LOG-1 or higher capability

**Task**: Verify that log integrity protection prevents attackers from covering their tracks after compromising a system by tampering with security logs. Without integrity protection, malicious actors who gain local access can modify or delete log entries to hide evidence of their activities, making incident response and forensic investigation impossible. Cryptographic integrity mechanisms ensure that any tampering is detected.

**Verification**:

1. Enable local security logging in browser configuration or enterprise policy
2. Generate security events that create local log entries
3. Locate the local log storage files in the browser's data directory
4. Verify that log files include cryptographic signatures or message authentication codes (MACs)
5. Attempt to modify a log entry manually and verify the tampering is detected
6. Check that log files use append-only mechanisms where supported by the OS
7. Verify log rotation maintains integrity chains between rotated files
8. Test that the browser detects and alerts on corrupted or tampered logs
9. Verify enterprise-mode logs support additional integrity mechanisms (digital signatures)
10. Test that log integrity is checked before logs are exported or transmitted
11. Local logs include integrity protection mechanisms (signatures, MACs, or hashes)
12. Tampering with log contents is detected by the browser
13. Log files use OS-level protection where available (append-only, immutable flags)
14. Log rotation preserves integrity chains across files
15. Corrupted logs trigger alerts or warnings
16. Enterprise deployments support strong integrity mechanisms (digital signatures)
17. Integrity checks occur before log export or transmission
18. Integrity metadata is stored separately from log content for additional protection

**Pass Criteria**: Logs include integrity protection (signatures/MACs/hashes) AND tampering is detected AND alerts are generated for integrity violations

**Fail Criteria**: Logs lack integrity protection OR tampering is not detected OR no alerts for integrity violations

**Evidence**: Log file analysis showing integrity mechanisms, tampering test results demonstrating detection, alert screenshots for corrupted logs, documentation of integrity algorithms used, enterprise policy configurations

**References**:

- NIST FIPS 180-4 Secure Hash Standard: https://csrc.nist.gov/publications/detail/fips/180/4/final
- Log Integrity and Non-Repudiation: https://www.nist.gov/publications/guide-computer-security-log-management
- Merkle Tree for Log Integrity: https://en.wikipedia.org/wiki/Merkle_tree
- OWASP Logging Guide - Integrity: https://cheatsheetseries.owasp.org/cheatsheets/Logging_Cheat_Sheet.html

### Assessment: LOG-REQ-12 (Log retention policies)

**Reference**: LOG-REQ-12 - Browser shall implement and enforce log retention policies that balance security needs with privacy requirements

**Given**: A conformant browser with LOG-1 or higher capability

**Task**: Verify that log retention policies balance security investigation needs against privacy rights by limiting how long personal data is stored. Excessive retention violates privacy regulations like GDPR which mandate data minimization, while insufficient retention hampers security incident investigation. Proper retention policies ensure logs are available for legitimate security purposes without becoming an indefinite privacy liability.

**Verification**:

1. Review browser documentation for default log retention policies
2. Examine local log storage to identify retention periods for different log types
3. Verify that security logs have appropriate retention (30-90 days typical)
4. Test that crash dumps are automatically deleted after retention period
5. Verify that telemetry data has shorter retention than security logs
6. Check that enterprise mode supports configurable retention policies
7. Test that log rotation occurs based on size and time criteria
8. Verify that users can manually clear logs before retention period expires
9. Test that retention policies are enforced even when browser is closed
10. Verify that regulatory compliance requirements (GDPR, etc.) are considered in retention
11. Default retention periods are documented for each log type
12. Security logs are retained longer than general telemetry (30-90 days vs. 7-30 days)
13. Automatic deletion occurs when retention period expires
14. Log rotation prevents disk exhaustion (size-based limits)
15. Enterprise policies allow customization of retention periods
16. Users can manually clear logs through settings or clear browsing data
17. Retention enforcement continues even when browser is not running
18. GDPR/privacy compliance is demonstrated through retention limits

**Pass Criteria**: Documented retention policies exist for all log types AND automatic deletion enforces retention AND policies comply with privacy regulations

**Fail Criteria**: No retention policies OR logs grow unbounded OR retention periods violate privacy regulations (too long)

**Evidence**: Retention policy documentation, log file age analysis, storage usage over time, automatic deletion test results, enterprise policy configuration examples, GDPR compliance analysis

**References**:

- NIST SP 800-92 Log Retention: https://csrc.nist.gov/publications/detail/sp/800-92/final
- ISO 27001 Log Management: https://www.iso.org/standard/54534.html
- PCI DSS Logging Requirements: https://www.pcisecuritystandards.org/

### Assessment: LOG-REQ-13 (Security dashboard)

**Reference**: LOG-REQ-13 - Browser shall provide a security dashboard that presents security events and status to users

**Given**: A conformant browser with LOG-1 or higher capability

**Task**: Verify that a security dashboard empowers users to understand their security posture and respond to threats by providing clear visibility into security events and protection status. Without a dashboard, users remain unaware of ongoing attacks, misconfigurations, or compromised security settings, leaving them vulnerable. Transparent security status information enables informed security decisions and builds user trust.

**Verification**:

1. Access the browser's security dashboard (e.g., chrome://settings/security, about:preferences#privacy)
2. Verify the dashboard displays current security status (safe/warning/critical)
3. Check that recent security events are listed with timestamps and descriptions
4. Trigger a security event (certificate error, malware warning, etc.) and verify it appears in the dashboard
5. Test that the dashboard categorizes events by severity (critical, warning, info)
6. Verify the dashboard shows security settings status (HTTPS-only, Safe Browsing, etc.)
7. Test that clicking on security events provides detailed information and remediation steps
8. Verify the dashboard updates in real-time or near-real-time when security events occur
9. Check that the dashboard is accessible from the main browser settings menu
10. Test that the dashboard supports filtering and searching of security events
11. Security dashboard is easily accessible from main settings
12. Current security status is clearly displayed with visual indicators
13. Recent security events are listed chronologically with timestamps
14. Events are categorized by severity level with appropriate visual coding
15. Each event includes actionable information and remediation guidance
16. Dashboard updates when new security events occur
17. Users can filter events by type, severity, or time period
18. Dashboard shows overall security posture (enabled protections)
19. Interface is user-friendly and avoids excessive technical jargon

**Pass Criteria**: Security dashboard is accessible AND displays recent security events with severity AND provides actionable remediation guidance

**Fail Criteria**: No security dashboard exists OR dashboard doesn't show events OR events lack context/remediation info

**Evidence**: Screenshots of security dashboard showing various states, video walkthrough of dashboard features, security event listings, user interface usability assessment, comparison with security best practices

**References**:

- Chrome Security Settings: https://support.google.com/chrome/answer/114836
- NIST Cybersecurity Framework - Detect: https://www.nist.gov/cyberframework
- User-Centered Security Design: https://www.usenix.org/conference/soups2019

### Assessment: LOG-REQ-14 (Incident detection)

**Reference**: LOG-REQ-14 - Browser shall implement automated incident detection based on security event patterns

**Given**: A conformant browser with LOG-2 or higher capability

**Task**: Verify that automated incident detection identifies active attacks by correlating security event patterns that indicate malicious activity, enabling rapid response before significant damage occurs. Manual log review alone cannot detect sophisticated attacks that span multiple events or occur at scale. Automated detection using heuristics and pattern matching provides early warning of credential stuffing, reconnaissance, malware distribution, and other attack campaigns.

**Verification**:

1. Configure the browser for enhanced security monitoring (enterprise mode if required)
2. Access browser's internal incident detection interfaces or logs
3. Simulate a credential stuffing attack by repeatedly entering wrong passwords
4. Verify that repeated authentication failures trigger an incident alert
5. Simulate a port scanning attack by navigating to many sequential ports on localhost
6. Verify that unusual network activity patterns are detected
7. Trigger multiple CSP violations in rapid succession and verify pattern detection
8. Test that suspicious extension behavior (excessive API calls) triggers alerts
9. Verify that malware download attempts are detected and blocked
10. Test that correlation of multiple minor events escalates to incident status
11. Automated detection identifies suspicious patterns (credential stuffing, scanning, etc.)
12. Incident detection uses heuristics and machine learning where appropriate
13. Multiple low-severity events can aggregate to trigger incident alerts
14. False positive rates are managed through tuning and whitelisting
15. Incidents are logged with detailed context for investigation
16. Users or administrators receive notifications for detected incidents
17. Incident severity is calculated based on event type and frequency
18. Detection rules are updated regularly to address new attack patterns

**Pass Criteria**: Automated detection identifies at least 3 attack patterns (credential stuffing, scanning, malware) AND incidents are logged with context AND alerts are generated

**Fail Criteria**: No automated detection occurs OR fewer than 3 attack patterns detected OR no alerts generated

**Evidence**: Incident detection logs showing various attack patterns, alert notifications, false positive analysis, detection rule documentation, test results for simulated attacks, tuning methodology

**References**:

- MITRE ATT&CK Framework: https://attack.mitre.org/
- NIST Incident Response Guide SP 800-61: https://csrc.nist.gov/publications/detail/sp/800-61/rev-2/final
- Browser Security Indicators: https://www.w3.org/TR/security-privacy-questionnaire/

### Assessment: LOG-REQ-15 (Audit trail completeness)

**Reference**: LOG-REQ-15 - Browser shall maintain complete audit trails for security-relevant administrative actions

**Given**: A conformant browser with LOG-2 or higher capability (enterprise mode)

**Task**: Verify that complete audit trails for administrative actions enable accountability and investigation of security policy changes, preventing unauthorized or malicious modifications from going unnoticed. Without comprehensive audit logging, insider threats or compromised administrator accounts can weaken security settings without detection. Complete audit trails create accountability and support forensic investigations when security incidents occur.

**Verification**:

1. Enable enterprise policy management for the browser
2. Change a security-critical setting (e.g., disable Safe Browsing, modify HTTPS-only mode)
3. Verify the change is logged with: timestamp, user/admin identity, setting name, old value, new value
4. Install or remove a browser extension and verify the action is logged
5. Modify certificate trust settings and verify the change is logged
6. Change cookie or site permission policies and verify logging
7. Modify content security policies and verify logging
8. Test that policy enforcement (GPO, MDM) actions are logged
9. Verify that failed administrative actions (insufficient permissions) are also logged
10. Export the audit log and verify it includes all tested actions with complete metadata
11. All security-relevant configuration changes are logged
12. Logs include: timestamp, user/admin identity, action type, object affected, before/after values
13. Both successful and failed administrative actions are logged
14. Extension lifecycle events (install/update/remove) are included
15. Certificate and trust anchor modifications are logged
16. Policy enforcement events are captured
17. Audit logs are tamper-evident and include integrity protection
18. Logs are exportable in standard formats (JSON, CSV, syslog)

**Pass Criteria**: All security-relevant administrative actions are logged with complete metadata AND failed actions are logged AND logs are exportable

**Fail Criteria**: Any security configuration change is not logged OR logs lack critical metadata OR logs are not exportable

**Evidence**: Audit log exports showing various administrative actions, log completeness analysis, integrity verification results, enterprise policy documentation, screenshots of logged events

**References**:

- NIST SP 800-53 Audit and Accountability: https://csrc.nist.gov/publications/detail/sp/800-53/rev-5/final
- ISO 27001 Audit Logging: https://www.iso.org/standard/54534.html
- CIS Controls - Audit Log Management: https://www.cisecurity.org/controls/

### Assessment: LOG-REQ-16 (Real-time security alerts)

**Reference**: LOG-REQ-16 - Browser shall provide real-time security alerts for critical security events

**Given**: A conformant browser with LOG-1 or higher capability

**Task**: Verify that real-time security alerts prevent users from inadvertently exposing themselves to immediate threats by providing prominent warnings before dangerous actions occur. Delayed or passive alerts allow users to proceed with risky actions like visiting malware sites or ignoring certificate errors. Immediate, blocking alerts with clear threat information enable users to make informed security decisions and avoid common attack vectors.

**Verification**:

1. Navigate to a site with a revoked certificate and verify immediate alert is displayed
2. Navigate to a known malware site (using Safe Browsing test URLs) and verify blocking alert
3. Trigger a password breach detection (if supported) and verify immediate notification
4. Install a malicious extension (test extension) and verify warning is displayed
5. Attempt to download a known malicious file and verify real-time blocking alert
6. Test that alerts are displayed before allowing dangerous actions (not after)
7. Verify alerts are prominent, modal, and cannot be easily dismissed accidentally
8. Test that alerts provide clear information about the threat and recommended actions
9. Verify enterprise mode supports additional real-time alerting (admin notifications)
10. Test that alert severity levels affect presentation (critical vs. warning vs. info)
11. Critical security events trigger immediate, modal alerts
12. Alerts are displayed before dangerous actions are allowed
13. Alert content is clear, specific, and actionable
14. Users should explicitly acknowledge alerts to proceed
15. Alerts distinguish between critical threats (malware) and warnings (certificate issues)
16. Visual design makes alerts prominent and attention-getting
17. Enterprise mode supports admin notifications for critical events
18. Alert fatigue is avoided through appropriate severity calibration
19. Alerts include context and remediation guidance

**Pass Criteria**: Critical security events trigger immediate modal alerts AND alerts provide clear threat information AND users should acknowledge before proceeding

**Fail Criteria**: No real-time alerts for critical events OR alerts are easily dismissed OR alerts lack actionable information

**Evidence**: Screenshots of various security alerts, video recordings of alert timing, user studies on alert comprehensibility, enterprise admin notification examples, alert frequency analysis

**References**:

- NIST Usable Security: https://www.nist.gov/programs-projects/usable-cybersecurity
- Google Safe Browsing: https://safebrowsing.google.com/
- Security Warning Design: https://www.usenix.org/conference/soups2019
- Alert Fatigue Research: https://www.ndss-symposium.org/ndss-paper/auto-draft-188/

### Assessment: LOG-REQ-17 (Forensic log export)

**Reference**: LOG-REQ-17 - Browser shall support forensic-quality log export for security investigations

**Given**: A conformant browser with LOG-2 or higher capability

**Task**: Verify that forensic log export enables detailed security investigations by providing complete, integrity-protected logs in standard formats that can be analyzed with industry-standard tools. Without proper export capabilities, security teams cannot perform comprehensive incident response or forensic analysis, limiting their ability to understand attack vectors, determine scope of compromise, or provide evidence for legal proceedings.

**Verification**:

1. Generate various security events across multiple sessions (certificate errors, CSP violations, etc.)
2. Access browser log export functionality (may require developer or enterprise mode)
3. Export security logs in multiple formats (JSON, CSV, syslog)
4. Verify exported logs include all events from the specified time period
5. Check that exported logs maintain chronological ordering
6. Verify exported logs include complete metadata (timestamps in ISO 8601 format, event IDs, etc.)
7. Test that log export includes integrity information (signatures or hashes)
8. Verify sensitive information is appropriately redacted in exported logs
9. Test that exported logs are in formats compatible with SIEM tools (Splunk, ELK, etc.)