CVE-2024-24765: CasaOS-UserService allows unauthorized access to any file

Summary

http://demo.casaos.io/v1/users/image?path=/var/lib/casaos/1/avatar.png

Originally it was to get the url of the user’s avatar, but the path filtering was not strict, making it possible to get any file on the system.

Details

Construct paths to get any file.

Such as the CasaOS user database, and furthermore can obtain system root privileges.

PoC

http://demo.casaos.io/v1/users/image?path=/var/lib/casaos/conf/../db/user.db

Impact

v0.4.6 all previous versions