mitigations.md

Mitigation Strategies Analysis for liujingxing/rxhttp

Mitigation Strategy: Secure Configuration and Usage of rxhttp Features

1. Converter Review:
   • If using custom converters with rxhttp, conduct a thorough security review of the converter code. Look for potential injection vulnerabilities, buffer overflows, or other security flaws. Prioritize using well-vetted libraries like Gson or Jackson over custom implementations.
   • If using default converters (Gson, Fastjson), ensure you're using the latest versions and are aware of any known vulnerabilities in those libraries. rxhttp's security depends on the security of its converters.
2. Interceptor Review:
   • Examine all custom rxhttp interceptors. Ensure they don't log sensitive data, weaken security settings (e.g., disable certificate validation), or introduce vulnerabilities through request/response modification. Interceptors have full access to the request and response.
   • Document the purpose and security implications of each interceptor.
3. Timeout Configuration:
   • Set explicit connect, read, and write timeouts on every rxhttp request using its configuration methods. Use values appropriate for the expected response times of the APIs you're calling. Avoid excessively long timeouts or no timeouts at all. Example: RxHttp.post("/api").connectTimeout(5000).readTimeout(10000).writeTimeout(10000)
4. Redirection Handling:
   • If redirects are necessary, validate the redirect URL before following it. rxhttp will provide the redirect URL; use this. Check against a whitelist of allowed domains or a regular expression that matches expected URL patterns.
   • If redirects are not needed, disable them globally or per-request: RxHttp.setOkHttpClient(new OkHttpClient.Builder().followRedirects(false).build()) or by configuring the underlying OkHttpClient instance.
5. Cookie Handling:
   • If using rxhttp's built-in cookie management, be aware of how it stores and handles cookies. Ensure that the server is setting appropriate HttpOnly and Secure flags.
   • If managing cookies manually, ensure you are following secure cookie handling best practices. rxhttp provides methods for accessing and modifying cookies; use these carefully.

• Threats Mitigated:

  • Injection Attacks via Custom Converters: (Severity: High) - Malicious input could exploit vulnerabilities in custom serialization/deserialization logic used with rxhttp.
  • Information Disclosure via Interceptors: (Severity: Medium) - Sensitive data could be logged or leaked through poorly written rxhttp interceptors.
  • Request/Response Tampering via Interceptors: (Severity: High) - rxhttp interceptors could be used to modify requests or responses in unintended ways, leading to security breaches.
  • Denial of Service (DoS) via Long Timeouts: (Severity: Medium) - Attackers could tie up application resources by making requests that never complete if rxhttp timeouts are not configured.
  • Open Redirect Vulnerabilities: (Severity: Medium) - Attackers could redirect users to malicious sites if rxhttp automatically follows unvalidated redirects.
  • Session Hijacking via Cookie Mishandling: (Severity: High) - Attackers could steal session cookies if rxhttp's cookie handling is not properly secured.

• Impact:

  • All Threats: Risk significantly reduced by careful review, secure configuration, and adherence to best practices within the context of using rxhttp.

• Currently Implemented:

  • Reasonable timeouts are set on most rxhttp requests.
  • Default converters (Gson) are used.

• Missing Implementation:

  • A comprehensive review of all custom rxhttp interceptors (if any) for security vulnerabilities is missing.
  • Explicit validation of redirect URLs is not consistently implemented within the rxhttp request handling logic.
  • Documentation of cookie handling practices specifically related to rxhttp's usage is incomplete.

Mitigation Strategy: Input Validation (Directly Related to rxhttp Usage)

1. URL Validation:
   • Thoroughly validate any user-provided data used to construct URLs that are passed to rxhttp. This includes query parameters, path segments, and the base URL itself. Use a robust URL parsing library to ensure the URL is well-formed and doesn't contain malicious components before calling rxhttp.
2. Header Validation:
   • Sanitize and validate any user-provided data used to set HTTP headers via rxhttp. Avoid blindly accepting headers from untrusted sources, as they could be used for injection attacks. Use rxhttp's header setting methods carefully.
3. Request Body Validation:
   • If the request body is constructed from user input and sent using rxhttp, validate it according to the expected format (e.g., JSON schema validation for JSON payloads). Ensure the data conforms to expected types and constraints before passing it to rxhttp.

• Threats Mitigated:

  • URL Manipulation Attacks (via rxhttp): (Severity: Medium to High) - Attackers could inject malicious characters or components into URLs passed to rxhttp to access unintended resources.
  • HTTP Header Injection (via rxhttp): (Severity: High) - Attackers could inject malicious headers through rxhttp to control the request or response.
  • Request Body Injection Attacks (via rxhttp): (Severity: High) - Attackers could inject malicious data into the request body sent via rxhttp.

• Impact:

  • All Threats: Risk significantly reduced by preventing malicious input from being processed by rxhttp.

• Currently Implemented:

  • Basic URL validation is performed in some parts of the code before calling rxhttp.
  • Request body validation is implemented for some API endpoints using JSON Schema before data is sent with rxhttp.

• Missing Implementation:

  • Consistent and comprehensive URL validation is missing across all code paths that use rxhttp.
  • HTTP header validation is largely absent before headers are set using rxhttp.
  • Request body validation is not consistently applied to all API endpoints before using rxhttp.