The rule-update feature in Cisco FireSIGHT Management Center (MC) 5.2 through 5.4.0.1 does not verify the X.509 certificate of the support.sourcefire.com SSL server, which allows man-in-the-middle attackers to spoof this server and provide an invalid package, and consequently execute arbitrary code, via a crafted certificate, aka Bug ID CSCuw06444.
packetstormsecurity.com/files/134390/Cisco-FireSIGHT-Management-Center-Certificate-Validation.html
seclists.org/fulldisclosure/2015/Nov/79
tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20151116-fmc
wadofstuff.blogspot.com.au/2015/11/cve-2015-6357-firepwner-exploit-for.html
www.securityfocus.com/archive/1/536913/100/0/threaded
www.securitytracker.com/id/1034161