Description
Jenkins before 1.650 and LTS before 1.642.2 do not use a constant-time algorithm to verify API tokens, which makes it easier for remote attackers to determine API tokens via a brute-force approach.
Remediation
References
http://rhn.redhat.com/errata/RHSA-2016-1773.html
https://access.redhat.com/errata/RHSA-2016:0711
https://wiki.jenkins-ci.org/display/SECURITY/Jenkins+Security+Advisory+2016-02-24