Youki is a container runtime written in Rust. In versions 0.5.6 and below, the initial validation of the source /dev/null is insufficient, allowing container escape when youki utilizes bind mounting the containers /dev/null as a file mask. This issue is fixed in version 0.5.7.
Weakness
The product, when opening a file or directory, does not sufficiently account for when the file is a symbolic link that resolves to a target outside of the intended control sphere. This could allow an attacker to cause the product to operate on unauthorized files.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Youki | Youki-dev | * | 0.5.7 (excluding) |
Potential Mitigations
- Follow the principle of least privilege when assigning access rights to entities in a software system.
- Denying access to a file can prevent an attacker from replacing that file with a link to a sensitive file. Ensure good compartmentalization in the system to provide protected areas that can be trusted.
Related Attack Patterns
References
- https://github.com/youki-dev/youki/commit/5886c91073b9be748bd8d5aed49c4a820548030a
- https://github.com/youki-dev/youki/security/advisories/GHSA-4g74-7cff-xcv8
- https://github.com/youki-dev/youki/security/advisories/GHSA-4g74-7cff-xcv8
- https://github.com/youki-dev/youki/security/advisories/GHSA-4g74-7cff-xcv8
- https://github.com/youki-dev/youki/security/advisories/GHSA-4g74-7cff-xcv8