Vulnerability identifier: #VU57047

Vulnerability risk: Low

CVSSv3.1: 3.3 [CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-39896

CWE-ID: CWE-613

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 user to gain access to sensitive information.

The vulnerability exists due to improper session management in impersonation feature. A remote administrator can use the impersonate feature twice and stops impersonating, the admin may be logged in as the second user they impersonated, which may lead to repudiation issues.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Gitlab Community Edition: 8.0 - 14.3.0

GitLab Enterprise Edition: 8.0.0 - 14.3.0

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External links
http://about.gitlab.com/releases/2021/09/30/security-release-gitlab-14-3-1-released/

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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.