Jenkins before 1.587 and LTS before 1.580.1 do not properly ensure trust separation between a master and slaves, which might allow remote attackers to execute arbitrary code on the master by leveraging access to the slave.
https://www.cloudbees.com/jenkins-security-advisory-2014-10-30
https://wiki.jenkins-ci.org/display/SECURITY/Jenkins+Security+Advisory+2014-10-30
https://wiki.jenkins-ci.org/display/JENKINS/Slave+To+Master+Access+Control