Gogs OS Command Injection vulnerability

Impact

The malicious user is able to update a crafted config file into repository's .git directory in combination with crafted file deletion to gain SSH access to the server on case-insensitive file systems. All installations with repository upload enabled (default) on case-insensitive file systems (Windows, macOS, etc.) are affected.

Patches

Make sanitization of upload path to .git directory to be case-insensitive. Users should upgrade to 0.12.11 or the latest 0.13.0+dev.

Workarounds

Disable repository upload.

References

https://huntr.dev/bounties/18cf9256-23ab-4098-a769-85f8da130f97/

For more information

If you have any questions or comments about this advisory, please post on https://github.com/gogs/gogs/issues/7030.