Improper access control in Pipeline: Groovy - CVE-2018-1000866
Published: October 7, 2019
Vulnerability identifier: #VU21574
CSH Severity: High
CVSS v4.0: 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-2018-1000866
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Jenkins
Affected software:
Pipeline: Groovy
Pipeline: Groovy
Detailed vulnerability description
The vulnerability allows a remote attacker to bypass sandbox restrictions.
The vulnerability exists in "groovy-sandbox/src/main/java/org/kohsuke/groovy/sandbox/SandboxTransformer.java" and "groovy-cps/lib/src/main/java/com/cloudbees/groovy/cps/SandboxCpsTransformer.java" due to the Groovy Sandbox library does not apply sandbox restrictions to finalize methods. A remote authenticated attacker with Job/Configure permission, or non-authenticated attacker with SCM commit privileges and corresponding pipelines based on Jenkins files set up in Jenkins, can bypass the sandbox protection and execute arbitrary code on the Jenkins master.
How to mitigate CVE-2018-1000866
Install updates from vendor's website.