Vulnerability identifier: #VU54096

Vulnerability risk: Low

CVSSv3.1: 2.3 [CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-22218

CWE-ID: CWE-295

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Gitlab Community Edition
Universal components / Libraries / Software for developers
GitLab Enterprise Edition
Universal components / Libraries / Software for developers

Vendor: GitLab, Inc

Description

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

The vulnerability exists due to improper handling of x509 certificates. A remote authenticated attacker can spoof author of signed commits. 

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Gitlab Community Edition: 12.8.0 - 13.12.1

GitLab Enterprise Edition: 12.8.0 - 13.12.0

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External links
http://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-22218.json
http://gitlab.com/gitlab-org/gitlab/-/issues/297665
http://hackerone.com/reports/1077019

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

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