Description
A path traversal vulnerability in Jenkins 2.185 and earlier, LTS 2.176.1 and earlier in core/src/main/java/hudson/model/FileParameterValue.java allowed attackers with Job/Configure permission to define a file parameter with a file name outside the intended directory, resulting in an arbitrary file write on the Jenkins master when scheduling a build.
Remediation
References
http://www.openwall.com/lists/oss-security/2019/07/17/2
http://www.securityfocus.com/bid/109299
https://access.redhat.com/errata/RHSA-2019:2503
https://access.redhat.com/errata/RHSA-2019:2548
https://jenkins.io/security/advisory/2019-07-17/#SECURITY-1424
https://www.tenable.com/security/research/tra-2019-35
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