Sandbox restrictions bypass in Script Security plugin for Jenkins

1) Improper access control

EUVDB-ID: #VU21569

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-2019-1003024

CWE-ID: CWE-284 - Improper Access Control

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass sandbox restrictions.

The vulnerability exists due to improper access restrictions in "RejectASTTransformsCustomizer.java". A remote authenticated attacker with Overall/Read permission, or the ability to control Jenkins file or sandboxed Pipeline shared library contents in SCM, can provide a Groovy script to an HTTP endpoint that can result in arbitrary code execution on the Jenkins master JVM.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Script Security: 1.0 - 1.52

CPE2.3

• cpe:2.3:a:jenkins:script-security:1.0:*:*:*:*:jenkins:*:*
• cpe:2.3:a:jenkins:script-security:1.1:*:*:*:*:jenkins:*:*
• cpe:2.3:a:jenkins:script-security:1.2:*:*:*:*:jenkins:*:*

External links

https://jenkins.io/security/advisory/2019-02-19/#SECURITY-1320

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.