Moby is an open source container framework. In Docker Engine prior to version 29.5.1, Docker Daemon versions 28.5.2 and prior, and Moby Daemon prior to version 2.0.0-beta.14, a race condition during docker cp mount setup allows a malicious container to redirect a bind mount target to an arbitrary host path, potentially overwriting host files or causing denial of service. This issue has been patched in Docker Engine version 29.5.1 and Moby Daemon version 2.0.0-beta.14.
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 |
|---|---|---|---|
| Engine | Docker | * | 29.5.1 (excluding) |
| Moby | Mobyproject | * | 28.5.2 (including) |
| Moby/v2 | Mobyproject | 2.0.0-beta0 (including) | 2.0.0-beta0 (including) |
| Moby/v2 | Mobyproject | 2.0.0-beta1 (including) | 2.0.0-beta1 (including) |
| Moby/v2 | Mobyproject | 2.0.0-beta10 (including) | 2.0.0-beta10 (including) |
| Moby/v2 | Mobyproject | 2.0.0-beta11 (including) | 2.0.0-beta11 (including) |
| Moby/v2 | Mobyproject | 2.0.0-beta12 (including) | 2.0.0-beta12 (including) |
| Moby/v2 | Mobyproject | 2.0.0-beta13 (including) | 2.0.0-beta13 (including) |
| Moby/v2 | Mobyproject | 2.0.0-beta2 (including) | 2.0.0-beta2 (including) |
| Moby/v2 | Mobyproject | 2.0.0-beta3 (including) | 2.0.0-beta3 (including) |
| Moby/v2 | Mobyproject | 2.0.0-beta4 (including) | 2.0.0-beta4 (including) |
| Moby/v2 | Mobyproject | 2.0.0-beta5 (including) | 2.0.0-beta5 (including) |
| Moby/v2 | Mobyproject | 2.0.0-beta6 (including) | 2.0.0-beta6 (including) |
| Moby/v2 | Mobyproject | 2.0.0-beta7 (including) | 2.0.0-beta7 (including) |
| Moby/v2 | Mobyproject | 2.0.0-beta8 (including) | 2.0.0-beta8 (including) |
| Moby/v2 | Mobyproject | 2.0.0-beta9 (including) | 2.0.0-beta9 (including) |
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.