Multiple stack-based buffer overflows in the process_sdp function in chan_sip.c of the SIP channel T.38 SDP parser in Asterisk before 1.4.3 allow remote attackers to execute arbitrary code via a long (1) T38FaxRateManagement or (2) T38FaxUdpEC SDP parameter in an SIP message, as demonstrated using SIP INVITE.
https://exchange.xforce.ibmcloud.com/vulnerabilities/33895
http://www.vupen.com/english/advisories/2007/1534
http://www.securitytracker.com/id?1018337
http://www.securitytracker.com/id?1017951
http://www.securityfocus.com/archive/1/472804/100/0/threaded
http://www.securityfocus.com/archive/1/466883/100/0/threaded
http://www.asterisk.org/files/ASA-2007-010.pdf