GHSA-5g94-c2wx-8pxw
apko has a path traversal in apko dirFS which allows filesystem writes outside base
Packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| Go | chainguard.dev/apko | >= 0.14.8, < 1.1.0 | 1.1.0 |
Details
As written in the advisory (Markdown source, shown as plain text).
A Path Traversal vulnerability was discovered in apko's dirFS filesystem abstraction. An attacker who can supply a malicious APK package (e.g., via a compromised or typosquatted repository) could create directories or symlinks outside the intended installation root. The MkdirAll, Mkdir, and Symlink methods in pkg/apk/fs/rwosfs.go use filepath.Join() without validating that the resulting path stays within the base directory.
**Fix:** Fixed by [d8b7887](https://github.com/chainguard-dev/apko/commit/d8b7887a968a527791b3c591ae83928cb49a9f14). Merged into release.
**Acknowledgements**
apko thanks Oleh Konko from [1seal](https://1seal.org/) for discovering and reporting this issue.
References
External links from the advisory. They lead to third-party sites.