Sandbox restrictions bypass in Pipeline: Groovy plugin for Jenkins

1) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU25279

Risk: High

CVSSv4.0: 6.3 [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]

CVE-ID: CVE-2020-2109

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

Exploit availability: No

Description

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.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Pipeline: Groovy: 2.0 - 2.78

CPE2.3

• cpe:2.3:a:jenkins:workflow-cps:2.0:*:*:*:*:jenkins:*:*
• cpe:2.3:a:jenkins:workflow-cps:2.1:*:*:*:*:jenkins:*:*
• cpe:2.3:a:jenkins:workflow-cps:2.2:*:*:*:*:jenkins:*:*

External links

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

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.