The SIP channel driver in Asterisk Open Source 1.4.x before 1.4.17, Business Edition before C.1.0-beta8, AsteriskNOW before beta7, Appliance Developer Kit before Asterisk 1.4 revision 95946, and Appliance s800i 1.0.x before 1.0.3.4 allows remote attackers to cause a denial of service (daemon crash) via a BYE message with an Also (Also transfer) header, which triggers a NULL pointer dereference.
https://www.redhat.com/archives/fedora-package-announce/2008-January/msg00167.html
https://www.redhat.com/archives/fedora-package-announce/2008-January/msg00166.html
https://exchange.xforce.ibmcloud.com/vulnerabilities/39361
http://www.vupen.com/english/advisories/2008/0019
http://www.securitytracker.com/id?1019152
http://www.securityfocus.com/archive/1/485727/100/0/threaded
http://securityreason.com/securityalert/3520
http://secunia.com/advisories/28312
http://secunia.com/advisories/28299