CVE-2024-23903: Non-constant time webhook token comparison in Jenkins GitLab Branch Source Plugin

January 24, 2024

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.

References

www.openwall.com/lists/oss-security/2024/01/24/6
github.com/advisories/GHSA-f67f-2j6r-m4c9
github.com/jenkinsci/gitlab-branch-source-plugin/commit/8bfe1046cf342b99419457b9336addbbf346f89a
nvd.nist.gov/vuln/detail/CVE-2024-23903
www.jenkins.io/security/advisory/2024-01-24/

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