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Mitigation Strategies Analysis for facebookarchive/three20

Mitigation Strategy: Focused Vulnerability Scanning and Static Analysis (Three20-Specific)

  1. Identify Three20 Code: Precisely delineate all directories and files within your project that are part of the Three20 library.

  2. Configure Static Analysis Tools:

    • SonarQube: Create a dedicated Quality Profile exclusively for Three20. Scope this profile to include only the identified Three20 files.
    • Semgrep: Develop custom rules or adapt existing Objective-C rulesets to target common vulnerability patterns. Configure Semgrep to scan only the Three20 directories.
    • Xcode Analyzer: While you can't directly target Three20, ensure it's enabled at its highest sensitivity.

  3. Regular, Targeted Scans: Schedule frequent scans (e.g., nightly) using the configured tools, specifically targeting the Three20 codebase.

  4. Prioritized Review (Three20 Only): Manually review all warnings and errors flagged within the Three20 code, regardless of severity. Do not dismiss any Three20-specific findings without thorough investigation.

  5. Document Three20 Findings: Maintain detailed records of any findings, including vulnerability type, location within Three20, potential impact, and remediation status.

    • Threats Mitigated:

      • Known Vulnerabilities in Three20 (High Severity): Directly identifies publicly known vulnerabilities within the Three20 library itself.
      • Potential Zero-Day Vulnerabilities in Three20 (Unknown Severity): May help uncover previously unknown vulnerabilities specific to Three20's code.
      • Three20-Specific Code Quality Issues (Low-Medium Severity): Detects code quality problems within Three20 that could be exploitable.

    • Impact:

      • Known Vulnerabilities in Three20: Significantly reduces the risk of exploiting known Three20 vulnerabilities.
      • Potential Zero-Day Vulnerabilities in Three20: Offers a chance of finding zero-days within Three20, but this is not guaranteed.
      • Three20-Specific Code Quality Issues: Improves the overall security posture of the Three20 components used in your application.

    • Currently Implemented:

      • SonarQube scans the entire project weekly.
      • Xcode analyzer is enabled with default settings.

    • Missing Implementation:

      • No dedicated SonarQube profile for Three20. Scans are not focused.
      • Semgrep is not used.
      • No process for prioritized review of only Three20-specific warnings.

Mitigation Strategy: Three20 Dependency Auditing and Cautious Forking

  1. Identify Three20's Dependencies: Use CocoaPods (if used for Three20) or manually inspect Three20's project files and source code to create a complete list of all libraries that Three20 itself depends on.
  2. Vulnerability Research (Three20 Dependencies): For each dependency used by Three20, search for known vulnerabilities using:
    • NVD (National Vulnerability Database)
    • GitHub Security Advisories
    • Relevant security blogs and mailing lists
  3. Update (If Possible & Compatible with Three20): If a Three20 dependency has a newer, secure version and that version is demonstrably compatible with Three20 (requires rigorous testing), update it.
  4. Forking (Three20 Dependencies - Last Resort): If a vulnerable Three20 dependency has no updates, or updates break Three20:
    • Create a private fork of the dependency's repository.
    • Apply only the essential security patches to the forked dependency. Avoid any other modifications.
    • Meticulously document every change made in the forked dependency.
    • Implement a comprehensive test suite specifically for the forked dependency to ensure the patch doesn't introduce new problems and remains compatible with Three20.
    • Continuously monitor the original dependency for official updates. If a secure update is released, switch back to it (after thorough testing with Three20).
  5. Three20 Forking (Extreme Last Resort): If critical security patches are needed directly within the Three20 codebase itself, and no other option exists:

    • Create a private fork of the Three20 repository.

    • Apply only the necessary security patches. Avoid any other changes.

    • Meticulously document every change made in the forked Three20.

    • Implement a comprehensive test suite specifically for the forked Three20 code.

    • Continuously monitor for any community efforts or discussions related to Three20 security, although this is unlikely given its archived status.

    • Threats Mitigated:

      • Vulnerable Dependencies of Three20 (High Severity): Directly addresses vulnerabilities in libraries that Three20 relies on, reducing the overall attack surface related to Three20's operation.
      • Supply Chain Attacks via Three20 Dependencies (Medium-High Severity): Mitigates the risk of a compromised dependency of Three20 being used as an attack vector.
      • Vulnerabilities inside Three20 itself (High Severity): Directly addresses vulnerabilities in Three20 library.

    • Impact:

      • Vulnerable Dependencies of Three20: Significantly reduces risk if vulnerable dependencies are updated or patched.
      • Supply Chain Attacks via Three20 Dependencies: Reduces the risk, but doesn't eliminate it (Three20 itself remains a potential supply chain risk).
      • Vulnerabilities inside Three20 itself: Significantly reduces risk if vulnerabilities are patched.

    • Currently Implemented:

      • Basic dependency checks during builds.

    • Missing Implementation:

      • No systematic vulnerability research for Three20's dependencies.
      • No established forking process or documentation specifically for Three20 or its dependencies.
      • No dedicated testing for forked dependencies or a forked Three20.

Mitigation Strategy: Minimize and Review Risky Three20 Component Usage

  1. Code Audit (Three20 Usage): Analyze your codebase to create a precise list of all Three20 classes and methods that your application actually uses.

  2. Risk Assessment (Three20 Components): Categorize each used Three20 component based on its inherent risk:

    • High Risk: Three20 components related to networking (TTURLRequest, TTURLCache), data persistence, and any custom URL scheme handlers built on Three20.
    • Medium Risk: Three20 components that handle user input or display data (e.g., TTTableViewController, TTTextEditor).
    • Low Risk: Three20 utility classes or components with limited functionality and no direct external interaction.

  3. Prioritize Replacement (Focus on Three20): Prioritize replacing high-risk Three20 components first. If a risky Three20 component is deemed essential, thoroughly review its implementation within the Three20 source code for potential security weaknesses.

  4. Document Three20 Component Risk: Maintain documentation of the risk assessment and replacement plan specifically for each Three20 component.

    • Threats Mitigated:

      • Vulnerabilities in Specific Three20 Components (Variable Severity): Reduces the attack surface by minimizing the use of potentially vulnerable parts of the Three20 library. The severity depends on the specific Three20 component.

    • Impact:

      • Vulnerabilities in Specific Three20 Components: Reduces risk proportionally to the number of risky Three20 components removed or replaced.

    • Currently Implemented:

      • No formal audit or risk assessment of Three20 component usage.

    • Missing Implementation:

      • The entire process is missing. No analysis, prioritization, or documentation specific to Three20 components exists.