SECURITY-2197 / CVE-2021-21615
Due to a time-of-check to time-of-use (TOCTOU) race condition, the file browser for workspaces, archived artifacts, and
$JENKINS_HOME/userContent/ follows symbolic links to locations outside the directory being browsed in Jenkins 2.275 and LTS 2.263.2.
This allows attackers with Job/Workspace permission and the ability to control workspace contents, e.g., with Job/Configure permission or the ability to change SCM contents, to create symbolic links that allow them to access files outside workspaces using the workspace browser.
NOTE: This issue is caused by an incorrectly applied fix for SECURITY-1452 / CVE-2021-21602 in the 2021-01-13 security advisory.
CloudBees Traditional Platforms should be upgraded 2.263.2.3
CloudBees Cloud Platforms should be upgraded 2.263.2.3
CloudBees Jenkins Enterprise should be upgraded the Managed Masters and Operations Center to 2.263.2.3
CloudBees Jenkins Platform (rolling train, CJP Operations Center and CJP Client Master (2.x.y.z) should be upgraded to version 2.263.2.3
CloudBees Jenkins Platform (fixed train, CJP Operations Center and CJP Client Master (2.249.x.0.z) should be upgraded to version 126.96.36.199.2
CloudBees Jenkins Platform (fixed train, CJP Operations Center and CJP Client Master (2.222.x.0.z) should be upgraded to version 188.8.131.52.2
CloudBees Jenkins Distribution should be upgraded 2.263.2.3