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| Package Name | Ecosystem | Vulnerable Versions | First Patched Version |
|---|---|---|---|
| mobsf | pip | <= 4.4.0 | 4.4.1 |
Miggo AIRoot Cause AnalysisThe vulnerability is a classic path traversal issue in the file download functionality of MobSF. The root cause lies in the is_safe_path function, which incorrectly used os.path.commonprefix to validate that a requested file path is within a designated safe directory. This method of validation can be bypassed by providing an absolute path that shares a common prefix with the safe directory, allowing access to sibling directories.
The download function in mobsf/MobSF/views/home.py is the entry point that receives the user-controlled filename. It then calls is_safe_path to perform the security check. The provided patch addresses the vulnerability by significantly strengthening the path validation logic. A new function, is_path_traversal, is introduced in mobsf/MobSF/utils.py to perform more rigorous checks, including looking for absolute paths, URL-encoded traversal sequences, and other malicious patterns. The is_safe_path function is updated to use this new, more secure validation function, and the download function is updated to call the patched is_safe_path with the necessary parameters.
Therefore, both mobsf.MobSF.views.home.download and mobsf.MobSF.utils.is_safe_path are identified as vulnerable. The former is the entry point that handles the malicious input, and the latter contains the flawed validation logic that enables the exploit.
