Code injection in Helm

1) Code injection

EUVDB-ID: #VU50431

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-21303

CWE-ID: CWE-74 - Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise the affected system.

The vulnerability exists due to insufficient sanitization of user-supplied data passed via various files in index.yaml, plugin.yaml, and Chart.yaml files and via a SemVer in the version field. A remote attacker can pass specially crafted data to the application and execute arbitrary code on the system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Helm: 3.0.0 - 3.5.0

External links

http://github.com/helm/helm/commit/6ce9ba60b73013857e2e7c73d3f86ed70bc1ac9a
http://github.com/helm/helm/releases/tag/v3.5.2
http://github.com/helm/helm/security/advisories/GHSA-c38g-469g-cmgx

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.