GHSA-jm56-5h66-w453

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GHSA-jm56-5h66-w453

Summary: Repository index file allows for duplicates of the same chart entry in helm

Details: ### Impact During a security audit of Helm's code base, security researchers at Trail of Bits identified a bug in which the a Helm repository can contain duplicates of the same chart, with the last one always used. If a repository is compromised, this lowers the level of access that an attacker needs to inject a bad chart into a repository. To perform this attack, an attacker must have write access to the index file (which can occur during a MITM attack on a non-SSL connection). ### Specific Go Packages Affected helm.sh/helm/v3/pkg/repo ### Patches This issue has been patched in Helm 3.3.2 and 2.16.11 ### Workarounds - do not install charts from repositories you do not trust - fetch charts using a secure channel of communication (such as TLS) - use `helm pull` to fetch the chart, then review the chart’s content (either manually, or with `helm verify` if it has been signed) to ensure it has not been tampered with - manually review the index file in the Helm repository cache before installing software.

References: https://github.com/helm/helm/security/advisories/GHSA-jm56-5h66-w453, https://nvd.nist.gov/vuln/detail/CVE-2020-15185, https://github.com/helm/helm/commit/055dd41cbe53ce131ab0357524a7f6729e6e40dc, https://github.com/helm/helm/commit/6aab63765f99050b115f0aec3d6350c85e8da946