GHSA-x6ph-r535-3vjw

apko is vulnerable to attack through incorrect permissions in /etc/ld.so.cache and other files

Source: GitHub Advisory Database (reviewed) High CVE-2025-53945

Packages

Ecosystem	Package	Affected	Fixed in
Go	chainguard.dev/apko	>= 0.27.0, < 0.29.5	0.29.5

Details

As written in the advisory (Markdown source, shown as plain text).

It was discovered that the ld.so.cache in images generated by apko had file system permissions mode `0666`: ``` bash-5.3# find / -type f -perm -o+w /etc/ld.so.cache ``` This issue was introduced in commit [04f37e2 ("generate /etc/ld.so.cache (#1629)")](https://github.com/chainguard-dev/apko/commit/04f37e2d50d5a502e155788561fb7d40de705bd9)([v0.27.0](https://github.com/chainguard-dev/apko/releases/tag/v0.27.0)). ### Impact This potentially allows a local unprivileged user to add additional additional directories including dynamic libraries to the dynamic loader path. A user could exploit this by placing a malicious library in a directory they control. ### Patches This issue was addressed in apko in [aedb077 ("fix: /etc/ld.so.cache file permissions (#1758)")](https://github.com/chainguard-dev/apko/commit/aedb0772d6bf6e74d8f17690946dbc791d0f6af3) ([v0.29.5](https://github.com/chainguard-dev/apko/releases/tag/v0.29.5)). ### Acknowledgements Many thanks to Cody Harris from [H2O.ai](http://h2o.ai/) for reporting this issue.

References

External links from the advisory. They lead to third-party sites.