chan_sip.c in the SIP channel driver in Asterisk Open Source 1.8.x before 1.8.11.1 and 10.x before 10.3.1 and Asterisk Business Edition C.3.x before C.3.7.4, when the trustrpid option is enabled, allows remote authenticated users to cause a denial of service (daemon crash) by sending a SIP UPDATE message that triggers a connected-line update attempt without an associated channel.
https://issues.asterisk.org/jira/browse/ASTERISK-19770
https://exchange.xforce.ibmcloud.com/vulnerabilities/75101
http://www.securitytracker.com/id?1026963
http://www.securityfocus.com/bid/53205
http://secunia.com/advisories/48891
http://lists.fedoraproject.org/pipermail/package-announce/2012-May/079759.html
http://downloads.asterisk.org/pub/security/AST-2012-006.html