Skip to content

Latest commit

 

History

History
138 lines (107 loc) · 11 KB

mitigations.md

File metadata and controls

138 lines (107 loc) · 11 KB

Mitigation Strategies Analysis for mozilla/addons-server

Mitigation Strategy: Automated Static Analysis of Addons

  • Description:

    1. Integrate a static analysis tool on the addons-server.
    2. Configure the addons-server to automatically run the static analysis tool against uploaded addon packages upon submission.
    3. The addons-server should be configured to use the tool to detect malicious patterns, vulnerabilities, and policy violations in addon code (JavaScript, manifest files, etc.).
    4. Implement logic in addons-server to automatically reject addon submissions based on critical issues identified by the static analysis tool.
    5. The addons-server should flag less severe issues for manual review and potentially provide warnings to developers through the server's interface.
    6. Regularly update the static analysis tool and its rules on the addons-server.

  • List of Threats Mitigated:

    • Malicious Addon Uploads (High Severity): Prevents the server from accepting and distributing addons containing overtly malicious code.
    • Vulnerable Addons (Medium Severity): Reduces the risk of the server distributing addons with known security vulnerabilities.
    • Policy Violations (Medium Severity): Enforces addon development policies server-side, preventing distribution of non-compliant addons.

  • Impact:

    • Malicious Addon Uploads: High reduction in risk by proactively blocking malicious submissions at the server level.
    • Vulnerable Addons: Medium reduction in risk by identifying and flagging common vulnerabilities server-side, requiring further manual review for complex cases.
    • Policy Violations: Medium reduction in risk by ensuring basic compliance is checked by the server before distribution.

  • Currently Implemented:

    • Likely partially implemented in addons-server. Look for server-side code related to addon validation during upload and processing.

  • Missing Implementation:

    • Advanced Static Analysis Integration on Server: Full server-side integration with a dedicated static analysis tool with security-focused rulesets.
    • Custom Security Rules on Server: Server-side configuration of specific rules tailored to the addon ecosystem's threats.
    • Server-Side Feedback Mechanism: Server-driven feedback to developers based on static analysis results through the addons-server interface.

Mitigation Strategy: Mandatory Human Security Review

  • Description:

    1. Implement a workflow within addons-server to queue submitted addons for manual security review.
    2. The addons-server should provide reviewers with access to addon code, requested permissions, and review tools through a server-side interface.
    3. Configure addons-server to enforce review status before an addon can be published or distributed.
    4. Implement server-side logging and tracking of review processes, decisions, and reviewer actions.
    5. The addons-server should manage reviewer roles and access control to the review workflow.

  • List of Threats Mitigated:

    • Sophisticated Malicious Addons (High Severity): Catches malicious addons that might evade automated server-side analysis.
    • Subtle Privacy Violations (Medium Severity): Server-managed review process allows for human assessment of privacy implications.
    • Logic Bugs and Unintended Consequences (Medium Severity): Server-side review process can detect logic flaws not caught by automated tools.

  • Impact:

    • Sophisticated Malicious Addons: High reduction in risk by adding a server-managed human review layer.
    • Subtle Privacy Violations: High reduction in risk through server-controlled review process focused on privacy.
    • Logic Bugs and Unintended Consequences: Medium reduction in risk by server-managed review process for identifying complex issues.

  • Currently Implemented:

    • Likely partially implemented in addons-server. Look for server-side workflows and interfaces related to addon review queues and reviewer roles.

  • Missing Implementation:

    • Dedicated Security Review Workflow in Server: A specific server-side workflow tailored for security-focused addon reviews.
    • Server-Side Review Tools Integration: Integration of security review tools within the addons-server interface for reviewers.
    • Server-Managed Security Review Guidelines: Server-accessible and enforced guidelines for security reviewers.

Mitigation Strategy: Code Signing and Signature Verification

  • Description:

    1. Configure addons-server to require developers to upload digitally signed addon packages.
    2. Implement a signature verification process within addons-server to validate digital signatures of uploaded addons server-side.
    3. addons-server should only accept and distribute addons with valid signatures.
    4. The server should store and manage information about addon signatures and display signature status in server-generated addon listings and API responses.
    5. Implement server-side key management and auditing for signing key infrastructure (if addons-server manages signing keys).

  • List of Threats Mitigated:

    • Addon Tampering (High Severity): Server-side verification prevents distribution of tampered addons.
    • Malicious Addon Injection (High Severity): Server-enforced signing makes injection harder in the distribution pipeline.
    • Origin Spoofing (Medium Severity): Server-displayed signature status helps users verify origin based on server-provided information.

  • Impact:

    • Addon Tampering: High reduction in risk by server-side enforcement of addon integrity.
    • Malicious Addon Injection: High reduction in risk due to server-side authentication of addon origin.
    • Origin Spoofing: Medium reduction in risk by server providing origin verification information to users.

  • Currently Implemented:

    • Likely implemented to some extent in addons-server. Look for server-side code related to signature verification during addon processing and storage/display of signature information.

  • Missing Implementation:

    • Strict Server-Side Enforcement of Signing: Server-side configuration to strictly enforce signing for all addon distributions.
    • Server-Side Transparency of Signing Process: Server-provided documentation and APIs for developers regarding signing requirements.
    • Server-Side User Information on Signatures: Server-generated UI elements and API responses clearly displaying signature status to users.

Mitigation Strategy: Rate Limiting and Abuse Prevention for Uploads

  • Description:

    1. Implement rate limiting on addon upload API endpoints within addons-server.
    2. Configure addons-server to use CAPTCHA or similar mechanisms to prevent automated uploads at the server level.
    3. Implement server-side monitoring of upload patterns to detect and flag suspicious activities.
    4. Integrate account verification and reputation systems within addons-server to manage developer access and upload limits server-side.
    5. Implement server-side logging of upload attempts and failures for auditing and incident response.

  • List of Threats Mitigated:

    • Automated Malicious Uploads (High Severity): Server-side rate limiting prevents bot-driven malicious uploads.
    • Denial of Service (DoS) Attacks on Review Pipeline (Medium Severity): Server-side rate limiting protects the review pipeline from overload.
    • Brute-Force Upload Attempts (Low Severity): Server-side rate limiting deters automated brute-force attacks.

  • Impact:

    • Automated Malicious Uploads: High reduction in risk by server-side prevention of large-scale automated attacks.
    • Denial of Service (DoS) Attacks on Review Pipeline: Medium reduction in risk by server-side protection of upload infrastructure.
    • Brute-Force Upload Attempts: Low reduction in risk, primarily server-side deterrent.

  • Currently Implemented:

    • Likely implemented to some degree in addons-server. Look for server-side middleware or configuration related to rate limiting and CAPTCHA on upload API endpoints.

  • Missing Implementation:

    • Granular Server-Side Rate Limiting: Server-side configuration for fine-grained rate limiting based on user roles or upload types.
    • Advanced Server-Side Abuse Detection: Server-side mechanisms beyond basic rate limiting for anomaly detection.
    • Server-Managed Account Reputation System: Server-side system to track and utilize developer reputation for upload management.

Mitigation Strategy: Staged Rollouts for Addon Updates

  • Description:

    1. Implement a staged rollout system within addons-server to control the distribution of addon updates.
    2. Configure addons-server to allow administrators to release updates to a percentage of users initially.
    3. Implement server-side monitoring of update rollouts to track errors and user feedback.
    4. Provide server-side controls to halt or rollback updates based on monitoring data.
    5. addons-server should manage update channels and rollout stages server-side.

  • List of Threats Mitigated:

    • Introduction of Vulnerabilities in Updates (Medium Severity): Server-controlled rollout limits the impact of vulnerable updates.
    • Unintended Functionality Changes (Medium Severity): Server-managed rollout allows for early detection of unintended changes.
    • Widespread Service Disruption from Updates (Medium Severity): Server-side rollout prevents widespread disruption from faulty updates.

  • Impact:

    • Introduction of Vulnerabilities in Updates: Medium reduction in risk through server-controlled phased deployment.
    • Unintended Functionality Changes: Medium reduction in risk by server-managed early detection and containment.
    • Widespread Service Disruption from Updates: Medium reduction in risk by server-side limitation of update impact.

  • Currently Implemented:

    • Potentially partially implemented in addons-server. Look for server-side features related to update channels, release stages, or percentage-based rollouts in update management.

  • Missing Implementation:

    • Granular Server-Side Rollout Control: Server-side configuration for fine-grained control over rollout parameters.
    • Automated Server-Side Monitoring and Rollback: Server-driven automated monitoring and rollback based on update metrics.
    • Server-Side User Communication during Rollouts: Server-managed communication to users about staged rollouts.