Jenkins GitHub Plugin 1.34.4 and earlier uses a non-constant time comparison function when checking whether the provided and computed webhook signatures are equal, allowing attackers to use statistical methods to obtain a valid webhook signature. GitHub Plugin 1.34.5 uses a constant-time comparison when validating the webhook signature.

References

• https://nvd.nist.gov/vuln/detail/CVE-2022-36885
• https://www.jenkins.io/security/advisory/2022-07-27/#SECURITY-1849
• http://www.openwall.com/lists/oss-security/2022/07/27/1
• https://github.com/jenkinsci/github-plugin/releases/tag/v1.34.5
• https://plugins.jenkins.io/github-issues/
• jenkinsci/github-plugin@11d1d79