Vulnerability identifier: #VU28332

Vulnerability risk: Low

CVSSv3.1: 4.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: N/A

CWE-ID: CWE-94

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 execute arbitrary code on the target system.

The vulnerability exists due to improper input validation. A remote attacker can send a specially crafted Mermaid payload and perform PUT requests on behalf of other users when clicking on a link.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Gitlab Community Edition: 12.9.0 - 13.0.0

GitLab Enterprise Edition: 12.9.0 - 13.0.0

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External links
http://about.gitlab.com/releases/2020/05/27/security-release-13-0-1-released/

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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.