- Platform: Android
- Weakness: MASWE-0018
- Weakness in the numbering of the MASWE beta: MASWE-0064
- Profiles: L1 (basic security), L2 (advanced security)
- Type: static, config, code, manual
- Knowledge: MASTG-KNOW-0020, MASTG-KNOW-0117
- Best practices: MASTG-BEST-0049
Overview
If the app exports an Android content provider without enforcing access restrictions, external callers may open private files through content:// URIs. This test checks whether exported providers expose sensitive stored data to callers that don't hold the required permissions.
Steps
- Use MASTG-TECH-0013 to reverse engineer the app.
- Use MASTG-TECH-0159 to identify exported file-based content providers and inspect their path configurations.
- Use MASTG-TECH-0014 to look for the relevant APIs.
Observation
The output should contain a list of exported file-based content providers with their path configurations, and a list of code locations where provider-backed file access occurs.
Evaluation
The test case fails if the app exports a FileProvider and if the provider's path configuration allows access outside the intended shared directory (for example, via <root-path>, path="/", path=".", or path="").
Further Validation Required:
Inspect each reported code location using MASTG-TECH-0023 to determine whether the exposure is security-relevant:
- Determine whether
FileProvider.getUriForFile()is called with attacker-controlled input (for example, values derived from URI query parameters or user input). - Determine whether the provider enforces appropriate access control, by using in the Android Manifest
android:permissionand an adequate protection level likedangerousorsignature.
Συνδεδεμένα ζητήματα
| Τύπος σύνδεσης | Ζήτημα |
|---|---|
| is related to | MASTG-BEST-0049 Restrict and Validate Access to Exported Content Providers (Android) |
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