Gogs is an open source self-hosted Git service. In version 0.13.3 and prior, a path traversal vulnerability exists in the updateWikiPage function of Gogs. The vulnerability allows an authenticated user with write access to a repository's wiki to delete arbitrary files on the server by manipulating the old_title parameter in the wiki editing form. This issue has been patched in versions 0.13.4 and 0.14.0+dev.

Affected: Go: gogs.io/gogs

### Summary A Path Traversal vulnerability exists in the `updateWikiPage` function of Gogs. The vulnerability allows an authenticated user with write access to a repository's wiki to delete arbitrary files on the server by manipulating the `old_title` parameter in the wiki editing form.

### Vulnerability Deatils The vulnerability is located in `internal/database/wiki.go`. When updating a wiki page, the application accepts an `old_title` parameter to identify the potential rename operation. This parameter is used directly in `path.Join` and `os.Remove` without proper sanitization.

Code snippet from `internal/database/wiki.go`: ```go // Line 114 os.Remove(path.Join(localPath, oldTitle+".md")) ```

If an attacker provides a path traversal sequence (e.g., `../../../../target`) as `old_title`, the `os.Remove` function will resolve the path relative to the wiki's local directory and delete the target file. The vulnerability is limited to deleting files that end with `.md` (due to the appended extension), but depending on the filesystem and specific `path.Join` behavior, or if critical `.md` files exist (e.g. documentation, other wikis), the impact is significant. Additionally, in some contexts, the extension might be bypassed or ignored.

### Impact - **Denial of Service**: Deletion of critical configuration files or data (if they match the extension or via other tricks). - **Data Loss**: Deletion of other users' wiki pages or documentation.

### Remediation Sanitize the `oldTit…

Ein entfernter, authentisierter Angreifer kann mehrere Schwachstellen in Gogs ausnutzen, um Sicherheitsmaßnahmen zu umgehen, Cross-Site-Scripting-Angriffe durchzuführen, Daten zu manipulieren, vertrauliche Informationen offenzulegen oder einen Denial-of-Service-Zustand zu verursachen.