CVE-2019-18658: Improper Link Resolution Before File Access ('Link Following')

May 24, 2022 (updated July 17, 2023)

In Helm 2.x before 2.15.2, commands that deal with loading a chart as a directory or packaging a chart provide an opportunity for a maliciously designed chart to include sensitive content such as /etc/passwd, or to execute a denial of service (DoS) via a special file such as /dev/urandom, via symlinks. No version of Tiller is known to be impacted. This is a client-only issue.

References

github.com/advisories/GHSA-p5pc-m4q7-7qm9
helm.sh/blog/2019-10-30-helm-symlink-security-notice/
nvd.nist.gov/vuln/detail/CVE-2019-18658

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