Vulnerability identifier: #VU86250

Vulnerability risk: Low

CVSSv3.1: 5.8 [CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-6840

CWE-ID: CWE-284

Exploitation vector: Network

Exploit availability: No

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

Vendor: GitLab, Inc

Description

The vulnerability allows a remote user to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to improper access restrictions within block_branch_modification setting. A remote administrator can change the name of a protected branch that bypasses the security policy added to block MR.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

GitLab Enterprise Edition: 16.4.0 - 16.8.1

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External links
http://gitlab.com/gitlab-org/gitlab/-/issues/435500
http://hackerone.com/reports/2280292

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Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

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