#VU83610 Improper access control in Gitlab Community Edition and GitLab Enterprise Edition - CVE-2023-5226

Vulnerability identifier: #VU83610

Vulnerability risk: Medium

CVSSv4.0: 1.9 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2023-5226

CWE-ID: CWE-284

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 gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to improper access restrictions within the main branch of a repository with a specially designed name. A remote user can use a specially crafted branch name to bypass prohibited branch checks and manipulate repository content in the UI.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Gitlab Community Edition: 0.1.5 - 16.6.0

GitLab Enterprise Edition: 6.2.0 - 16.6.0

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External links
https://about.gitlab.com/releases/2023/11/30/security-release-gitlab-16-6-1-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.