Related Vulnerabilities: CVE-2021-21687  

A security issue has been found in Jenkins before version 2.319. FilePath#untar does not check permission to create symbolic links when unarchiving a symbolic link. This allows agent processes to read and write arbitrary files on the Jenkins controller file system, and obtain some information about Jenkins controller file systems.

Severity Critical

Remote Yes

Type Arbitrary filesystem access

Description

A security issue has been found in Jenkins before version 2.319. FilePath#untar does not check permission to create symbolic links when unarchiving a symbolic link. This allows agent processes to read and write arbitrary files on the Jenkins controller file system, and obtain some information about Jenkins controller file systems.

AVG-2526 jenkins 2.318-1 Critical Vulnerable

https://www.jenkins.io/security/advisory/2021-11-04/#SECURITY-2455