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GHSA-rw9q-97r9-8gvh
No affected components available
Summary
mEye contains an absolute path traversal vulnerability in multiple media file handlers that allows an attacker to read arbitrary files from the filesystem.
The affected handlers accept a user-controlled filename parameter and construct filesystem paths using os.path.join(). When an absolute path is supplied, Python discards the configured media directory and returns the attacker-supplied path directly. The application then bypasses Tornado's built-in path validation by overriding the relevant safety checks.
As a result, an attacker can access files outside of the configured camera media directory, subject to the permissions of the motionEye process.
Details
The issue exists in the media playback and download functionality.
The filename parameter is passed to mediafiles.get_media_path():
def get_media_path(camera_config, path, media_type):
target_dir = camera_config.get('target_dir')
full_path = os.path.join(target_dir, path)
return full_path
When path is an absolute path (e.g. /etc/motioneye/motion.conf), Python's os.path.join() discards target_dir entirely and returns the absolute path as-is. This would normally be caught by Tornado's StaticFileHandler path validation, but MoviePlaybackHandler explicitly overrides both safety checks (movie_playback.py lines 111-115):
def get_absolute_path(self, root, path):
return path
def validate_absolute_path(self, root, absolute_path):
return absolute_path
This allows reading any file on the filesystem that the motionEye process can access.
The same path traversal exists in the movie download, picture download, and picture preview handlers:
- GET /movie/<camera_id>/download/<filename>
- GET /picture/<camera_id>/download/<filename>
- GET /picture/<camera_id>/preview/<filename>
PoC
GET /movie/1/playback//etc/motioneye/motion.conf HTTP/1.1
Host: target:8765
Fix
Do not allow absolute paths supplied by user input.
Validate that the fully resolved canonical path remains within the configured camera media directory before serving a file.
Additionally, Tornado’s built-in path validation should not be bypassed unless equivalent validation is performed by motionEye.
Measures severity based on intrinsic characteristics of the vulnerability, independent of environment.
No exploitation activity has been observed at this time. Continue routine monitoring.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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