In Helm before versions 2.16.11 and 3.3.2, a Helm plugin can contain duplicates of the same entry, with the last one always used. If a plugin is compromised, this lowers the level of access that an attacker needs to modify a plugin’s install hooks, causing a local execution attack. To perform this attack, an attacker must have write access to the git repository or plugin archive (.tgz) while being downloaded (which can occur during a MITM attack on a non-SSL connection). This issue has been patched in Helm 2.16.11 and Helm 3.3.2. As a possible workaround make sure to install plugins using a secure connection protocol like SSL.
Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-15187
Reference (s):
- https://github.com/helm/helm/security/advisories/GHSA-c52f-pq47-2r9j
- URL: https://github.com/helm/helm/security/advisories/GHSA-c52f-pq47-2r9j
- https://github.com/helm/helm/commit/d9ef5ce8bad512e325390c0011be1244b8380e4b
- URL: https://github.com/helm/helm/commit/d9ef5ce8bad512e325390c0011be1244b8380e4b