Description
The Plugins Manager in Jenkins before 1.640 and LTS before 1.625.2 does not verify checksums for plugin files referenced in update site data, which makes it easier for man-in-the-middle attackers to execute arbitrary code via a crafted plugin.
Remediation
References
http://rhn.redhat.com/errata/RHSA-2016-0489.html
https://access.redhat.com/errata/RHSA-2016:0070
https://wiki.jenkins-ci.org/display/SECURITY/Jenkins+Security+Advisory+2015-12-09
Related Vulnerabilities
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CVE-2012-0392 Vulnerability in maven package org.apache.struts:struts2-core
CVE-2016-4567 Vulnerability in maven package org.webjars:mediaelement
CVE-2013-4271 Vulnerability in maven package org.restlet:org.restlet