CVE-2023-28642: Improper Link Resolution Before File Access ('Link Following')

March 29, 2023 (updated November 9, 2023)

runc is a CLI tool for spawning and running containers according to the OCI specification. It was found that AppArmor can be bypassed when /proc inside the container is symlinked with a specific mount configuration. This issue has been fixed in runc version 1.1.5, by prohibiting symlinked /proc. See PR #3785 for details. users are advised to upgrade. Users unable to upgrade should avoid using an untrusted container image.

References

github.com/opencontainers/runc/pull/3785
github.com/opencontainers/runc/security/advisories/GHSA-g2j6-57v7-gm8c
nvd.nist.gov/vuln/detail/CVE-2023-28642

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