Adaptive Computing Moab before 7.2.9 and 8 before 8.0.0 allows remote attackers to bypass the signature check, impersonate arbitrary users, and execute commands via a message without a signature.
https://exchange.xforce.ibmcloud.com/vulnerabilities/96699
http://www.securityfocus.com/bid/70173
http://www.securityfocus.com/archive/1/533574/100/0/threaded