Entire CLI: Path traversal in checkpoint session metadata allows arbitrary file write during resume/rewind

Impact

A path traversal vulnerability in Entire CLI allows an attacker with push access to the checkpoints repository to craft malicious checkpoint metadata that causes entire session resume or entire checkpoint rewind to write attacker-controlled transcript data outside of the expected session directory.

The issue occurs because checkpoint metadata is fetched from the remote entire/checkpoints/v1 branch and the SessionID field was used to construct filesystem paths without validation in the restore path. A malicious SessionID containing absolute paths or path traversal sequences could cause arbitrary files on the victim’s machine to be overwritten.

Patches

The patched versions (v0.7.7 or v0.7.8-nightly.*) observe stronger input validation and enforce traversal-resistant primitives to ensure that only descending directories can be accessed by the affected commands.

Workarounds

If upgrading immediately is not possible:

• Do not run entire session resume or entire checkpoint rewind on repositories where untrusted users can push to entire/checkpoints/v1.
• Restrict push access to shared repositories until all collaborators have upgraded.
• Inspect the entire/checkpoints/v1 branch for suspicious checkpoint metadata before resuming or rewinding.
• Remove or protect shell initialization files and other sensitive user-writable files where feasible.

These mitigations reduce exposure but do not fully address the vulnerability. Upgrading is recommended.

Credits

Thanks Navtej Kathuria for privately reporting this issue to the Entire Security team.