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Mitigation Strategies Analysis for alibaba/druid

Mitigation Strategy: Druid Configuration Hardening

  • Description:

    1. Review Druid Configuration: Examine your Druid configuration file (e.g., druid.properties, application.yml) and identify all configurable settings.
    2. Disable Unnecessary Druid Features: Disable Druid features not essential for your application's core functionality. Examples include:
      • StatFilter and ResetStatFilter if not actively used for production monitoring.
      • Potentially less used SQL parser extensions if your application uses a limited SQL subset.
    3. Restrict Druid Monitoring Access: Secure access to Druid's monitoring pages (e.g., /druid/index.html) by implementing strong authentication and authorization. Limit access to authorized administrators/developers. Configure web server or application server to protect these endpoints.
    4. Carefully Configure stat and reset-stat Interceptors: If StatFilter and ResetStatFilter are enabled, ensure they are configured with strict access controls. Consider disabling them in production if not actively needed.
    5. Limit SQL Parser Capabilities (If Possible): Explore Druid's configuration options to restrict the SQL parser's capabilities if your application uses a limited subset of SQL features. This reduces the risk from complex SQL syntax vulnerabilities.

  • List of Threats Mitigated:

    • Reduced Attack Surface (Low Severity, Cumulative Impact): Disabling features reduces potential entry points.
    • Information Disclosure (Medium Severity): Restricting monitoring access prevents unauthorized viewing of sensitive database/application info.
    • Privilege Escalation (Low Severity): Limiting exposed information indirectly reduces potential for escalation.

  • Impact:

    • Reduced Attack Surface: Low Risk Reduction - Each disabled feature contributes to a smaller attack surface.
    • Information Disclosure: Medium Risk Reduction - Significantly reduces risk of unauthorized monitoring data access.
    • Privilege Escalation: Low Risk Reduction - Indirectly reduces escalation risk.

  • Currently Implemented:

    • Location: ResetStatFilter is disabled in production (druid.properties). HTTP Basic Authentication is on /druid/* endpoints in production (Nginx).

  • Missing Implementation:

    • Location: StatFilter is still enabled in all environments. SQL parser capabilities are not restricted. Role-based authorization for Druid monitoring is missing (currently only basic auth).

Mitigation Strategy: SQL Firewall (Wall Filter) Configuration and Customization

  • Description:

    1. Enable Druid Wall Filter: Ensure WallFilter is enabled in Druid configuration (e.g., in filters section).
    2. Review Default Wall Filter Rules: Understand the default rules of WallFilter and what SQL syntax/operations are blocked.
    3. Customize Wall Filter Rules: Tailor WallFilter to your application's SQL usage:
      • Add Custom Rules: Block specific SQL keywords, functions, or patterns not needed by your application.
      • Modify Existing Rules: Adjust severity/behavior of default rules if needed.
      • Whitelist Allowed SQL: Whitelist legitimate SQL syntax used by your application that might be flagged by default rules.
    4. Test Wall Filter Effectiveness: Test to ensure it blocks malicious SQL but allows legitimate application queries.
    5. Regularly Update Wall Filter Rules: Review and update rules as application evolves and new SQL injection techniques emerge.

  • List of Threats Mitigated:

    • SQL Injection (Medium to High Severity): Provides a secondary defense layer against SQL injection by blocking malicious SQL queries.

  • Impact:

    • SQL Injection: Medium to High Risk Reduction - WallFilter can block many SQL injection attempts, especially when customized. Impact depends on rule comprehensiveness and attack sophistication.

  • Currently Implemented:

    • Location: Druid WallFilter is enabled in global configuration (druid.properties) for all environments with default rules.

  • Missing Implementation:

    • Location: Customization of WallFilter rules is missing. Default rules are used without application-specific tailoring. Consider reviewing and customizing rules for enhanced protection.

Mitigation Strategy: Druid Version Management and Patching

  • Description:

    1. Track Druid Releases: Monitor official Druid project website, GitHub, or mailing lists for new releases and security announcements.
    2. Review Release Notes: Review release notes for security fixes, vulnerability patches, and security changes.
    3. Plan Upgrades: Plan regular upgrades to the latest stable Druid version as part of application maintenance.
    4. Test Upgrades Thoroughly: Test upgrades in staging/testing before production to ensure compatibility and identify issues.
    5. Automate Dependency Updates (If Possible): Use dependency management tools to streamline Druid and dependency updates.

  • List of Threats Mitigated:

    • Exploitation of Known Vulnerabilities (High Severity): Reduces risk of exploiting patched vulnerabilities in older Druid versions.

  • Impact:

    • Exploitation of Known Vulnerabilities: High Risk Reduction - Staying up-to-date is crucial for mitigating known vulnerabilities.

  • Currently Implemented:

    • Location: Druid version managed via Maven (currently 1.2.8).

  • Missing Implementation:

    • Location: No formal process for regularly checking for new Druid releases and planning upgrades. Dependency updates are reactive. Implement a process for regular Druid release reviews and proactive upgrade planning.