CVE-2021-21686: Improper Link Resolution Before File Access ('Link Following')

November 4, 2021 (updated November 22, 2023)

File path filters in the agent-to-controller security subsystem of Jenkins do not canonicalize paths, allowing operations to follow symbolic links to outside allowed directories.

References

nvd.nist.gov/vuln/detail/CVE-2021-21686
www.jenkins.io/security/advisory/2021-11-04/

Code Behaviors & Features

Detect and mitigate CVE-2021-21686 with GitLab Dependency Scanning

Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Dependency Scanning using SBOM also detects vulnerabilities from proprietary advisories that this site does not include. Learn more about Dependency Scanning using SBOM →