CVE-2024-23652: BuildKit possible host system access from mount stub cleaner

Vulnerability summary

CVE-2024-23652 is a critical (CVSS 10.0) vulnerability in moby buildkit. EPSS estimates a 2.46% chance of exploitation in the next 30 days, higher than 84.4% of scored vulnerabilities.

Timeline

1. 31-01-2024
   PublishedVulnerability first disclosed.
2. 17-06-2025
   Last modifiedVulnerability information updated.

Description

BuildKit is a toolkit for converting source code to build artifacts in an efficient, expressive and repeatable manner. A malicious BuildKit frontend or Dockerfile using RUN --mount could trick the feature that removes empty files created for the mountpoints into removing a file outside the container, from the host system. The issue has been fixed in v0.12.5. Workarounds include avoiding using BuildKit frontends from an untrusted source or building an untrusted Dockerfile containing RUN --mount feature.

• CWE-22Improper Limitation of a Pathname to a Restricted DirectoryThe product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.