GHSA-f585-9fw3-rj2m

Arbitrary file existence check in file fingerprints in Jenkins

Description

Jenkins provides a feature for jobs to store and track fingerprints of files used during a build. Jenkins 2.274 and earlier, LTS 2.263.1 and earlier provides a REST API to check where a given fingerprint was used by which builds. This endpoint does not fully validate that the provided fingerprint ID is properly formatted before checking for the XML metadata for that fingerprint on the controller file system. This allows attackers with Overall/Read permission to check for the existence of XML files on the controller file system where the relative path can be constructed as 32 characters. Jenkins 2.275, LTS 2.263.2 validates that a fingerprint ID is properly formatted before checking for its existence.

Affected packages

References

• https://nvd.nist.gov/vuln/detail/CVE-2021-21606 ADVISORY
• https://github.com/jenkinsci/jenkins/commit/f576b2eb4375f2bb076ce477cee27a946b65f22a WEB
• https://github.com/jenkinsci/jenkins PACKAGE
• https://www.jenkins.io/security/advisory/2021-01-13/#SECURITY-2023 WEB

Sources