Impact
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.
Patches
The issue has been fixed in v0.12.5
Workarounds
Avoid using BuildKit frontend from an untrusted source or building an untrusted Dockerfile containing RUN --mount feature.
References
rmcnamara-snyk Reporter
Impact
A malicious BuildKit frontend or Dockerfile using
RUN --mountcould trick the feature that removes empty files created for the mountpoints into removing a file outside the container, from the host system.Patches
The issue has been fixed in v0.12.5
Workarounds
Avoid using BuildKit frontend from an untrusted source or building an untrusted Dockerfile containing
RUN --mountfeature.References