SB2020070610 - Information disclosure in Helm

Description

This security bulletin contains information about 1 vulnerability.

1) Path traversal (CVE-ID: CVE-2020-4053)

CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a remote attacker to perform directory traversal attacks.

The vulnerability exists due to input validation error when processing directory traversal sequences when installing Helm plugins from a tar archive over HTTP. A remote attacker can trick the victim to install a malicious plugin that can inject a relative path into a plugin archive, and copy a file outside of the intended directory.

Remediation

Install update from vendor's website.

References

• https://github.com/helm/helm/commit/0ad800ef43d3b826f31a5ad8dfbb4fe05d143688
• https://github.com/helm/helm/releases/tag/v3.2.4
• https://github.com/helm/helm/security/advisories/GHSA-qq3j-xp49-j73f