Vulnerability · Published Jan 24, 2024 · Assigned by jenkins

CVE-2024-23903

Medium 5.3

In plain English

A medium-severity security flaw in Jenkins GitLab Branch Source Plugin from Jenkins Project. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 43% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.3Medium

Exploit odds (30 days)0.5%top 56.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Jenkins GitLab Branch Source Plugin 684.vea_fa_7c1e2fe3 and earlier uses a non-constant time comparison function when checking whether the provided and expected webhook token are equal, potentially allowing attackers to use statistical methods to obtain a valid webhook token.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Maven	io.jenkins.plugins:gitlab-branch-source	688.v5fa	GHSA-f67f-2j6r-m4c9

Affected products (as reported)

Vendor	Product	Versions
Jenkins Project	Jenkins GitLab Branch Source Plugin	0 – through 684.vea_fa_7c1e2fe3

Weakness: CWE-697 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

References

Jenkins Security Advisory 2024-01-24 vendor-advisory
http://www.openwall.com/lists/oss-security/2024/01/24/6