The RPC service in mediasvr.exe in CA BrightStor ARCserve Backup 11.5 SP2 build 4237 allows remote attackers to execute arbitrary code via crafted xdr_handle_t data in RPC packets, which is used in calculating an address for a function call, as demonstrated using the 191 (0xbf) RPC request.
https://exchange.xforce.ibmcloud.com/vulnerabilities/33316
http://www.vupen.com/english/advisories/2007/1161
http://www.shirkdog.us/shk-004.html
http://www.shirkdog.us/camediasvrremote.py
http://www.securitytracker.com/id?1017830
http://www.securityfocus.com/bid/23209
http://www.securityfocus.com/archive/1/464343/100/0/threaded
http://www.securityfocus.com/archive/1/464270/100/0/threaded
http://www.kb.cert.org/vuls/id/151305
http://supportconnectw.ca.com/public/storage/infodocs/babmedser-secnotice.asp
http://securityreason.com/securityalert/2509
http://secunia.com/advisories/24682
http://archives.neohapsis.com/archives/fulldisclosure/2007-03/0467.html