Information disclosure in Helm

1) Path traversal

EUVDB-ID: #VU29537

Risk: Low

CVSSv3.1: 3.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-4053

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

Exploit availability: No

Description

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.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Helm: 3.0.0 - 3.2.3

External links

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

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.