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.
downloads.asterisk.org/pub/security/AST-2012-006.html
lists.fedoraproject.org/pipermail/package-announce/2012-May/079759.html
osvdb.org/81456
secunia.com/advisories/48891
www.securityfocus.com/bid/53205
www.securitytracker.com/id?1026963
exchange.xforce.ibmcloud.com/vulnerabilities/75101
issues.asterisk.org/jira/browse/ASTERISK-19770