Improper Authorization in Jenkins Gitlab Authentication plugin

1) Improper Authorization

EUVDB-ID: #VU30134

Risk: High

CVSSv3.1: 7.1 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-2228

CWE-ID: CWE-285 - Improper Authorization

Exploit availability: No

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

External links

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

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.