Description
A sandbox bypass vulnerability exists in Jenkins Script Security Plugin 1.50 and earlier in src/main/java/org/jenkinsci/plugins/scriptsecurity/sandbox/groovy/SecureGroovyScript.java that allows attackers with Overall/Read permission to provide a Groovy script to an HTTP endpoint that can result in arbitrary code execution on the Jenkins master JVM.
Remediation
References
http://packetstormsecurity.com/files/166778/Jenkins-Remote-Code-Execution.html
https://access.redhat.com/errata/RHSA-2019:0739
https://jenkins.io/security/advisory/2019-01-28/#SECURITY-1292
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