#VU30134 Improper Authorization in Gitlab Authentication - CVE-2020-2228

Vulnerability identifier: #VU30134

Vulnerability risk: High

CVSSv4.0: 7.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2020-2228

CWE-ID: CWE-285

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Gitlab Authentication
Client/Desktop applications / Software for system administration

Vendor: Jenkins

Description

The vulnerability allows a remote attacker to bypass authorization process.

The vulnerability exists due to the affected plugin does not differentiate between user names and hierarchical group names when performing authorization. A remote attacker with permissions to create groups in GitLab can gain the privileges granted to another user or group.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Gitlab Authentication: 0.1 - 1.5

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External links
https://www.openwall.com/lists/oss-security/2020/07/15/5
https://jenkins.io/security/advisory/2020-07-15/#SECURITY-1792

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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