Permissions, Privileges, and Access Controls in Pipeline: Groovy - CVE-2020-2109

Vulnerability identifier: #VU25279

CSH Severity: High

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2020-2109

CWE-ID: CWE-264

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to escalate privileges on the system.

The vulnerability exists due to the sandbox protection in the affected plugin can be circumvented through default parameter expressions in CPS-transformed methods. A remote authenticated attacker can specify and run sandboxed Pipelines to execute arbitrary code in the context of the Jenkins master JVM.

Pipeline: Groovy
jenkins-2-plugins (Red Hat package)
Red Hat OpenShift Container Platform

Install updates from vendor's website.

Pipeline: Groovy - update to 2.79
jenkins-2-plugins (Red Hat package) - addressed in versions 3.11.1591354111-1.el7, 4.3.1597915133-1.el7, 4.4.1592817009-1.el7

• http://www.openwall.com/lists/oss-security/2020/02/12/3
• https://jenkins.io/security/advisory/2020-02-12/#SECURITY-1710

• Sandbox restrictions bypass in Pipeline: Groovy plugin for Jenkins
• Red Hat OpenShift Container Platform 4 update for jenkins-2-plugins
• Red Hat OpenShift Container Platform 3.11 update for jenkins-2-plugins
• Red Hat OpenShift Container Platform 4.3 update for jenkins-2-plugins