#VU25279 Permissions, Privileges, and Access Controls in Pipeline: Groovy - CVE-2020-2109

Vulnerability identifier: #VU25279

Vulnerability 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

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Pipeline: Groovy
Web applications / Modules and components for CMS

Vendor: Jenkins

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

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

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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.