CVE-2019-11251: Improper Link Resolution Before File Access ('Link Following')

May 18, 2021 (updated September 18, 2023)

The Kubernetes kubectl cp command in versions 1.1-1.12, and versions prior to 1.13.11, 1.14.7, and 1.15.4 allows a combination of two symlinks provided by tar output of a malicious container to place a file outside of the destination directory specified in the kubectl cp invocation. This could be used to allow an attacker to place a nefarious file using a symlink, outside of the destination tree.

References

github.com/advisories/GHSA-6qfg-8799-r575
github.com/kubernetes/kubernetes/issues/87773
github.com/kubernetes/kubernetes/pull/82143
groups.google.com/d/msg/kubernetes-announce/YYtEFdFimZ4/nZnOezZuBgAJ
nvd.nist.gov/vuln/detail/CVE-2019-11251

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