SB2020021302 - Sandbox restrictions bypass in Pipeline: Groovy plugin for Jenkins

Description

This security bulletin contains information about 1 vulnerability.

1) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2020-2109)

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

CVSSv4: 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/E:U/U:Amber

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.

Remediation

Install update from vendor's website.

References

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