CVE-2024-23651: BuildKit possible race condition with accessing subpaths from cache mounts

Vulnerability summary

CVE-2024-23651 is a high (CVSS 8.7) vulnerability in moby buildkit. EPSS estimates a 0.91% chance of exploitation in the next 30 days, higher than 60% of scored vulnerabilities.

Timeline

1. 31-01-2024
   PublishedVulnerability first disclosed.
2. 29-05-2025
   Last modifiedVulnerability information updated.

Description

BuildKit is a toolkit for converting source code to build artifacts in an efficient, expressive and repeatable manner. Two malicious build steps running in parallel sharing the same cache mounts with subpaths could cause a race condition that can lead to files from the host system being accessible to the build container. The issue has been fixed in v0.12.5. Workarounds include, avoiding using BuildKit frontend from an untrusted source or building an untrusted Dockerfile containing cache mounts with --mount=type=cache,source=... options.

• CWE-362Concurrent Execution using Shared Resource with Improper SynchronizationThe product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.