The SIP channel driver (channels/chan_sip.c) in Asterisk Open Source
1.8.x before 22.214.171.124, 10.x before 10.12.3, and 11.x before 11.5.1;
Certified Asterisk 1.8.15 before 1.8.15-cert3 and 11.2 before
11.2-cert2; and Asterisk Digiumphones 10.x-digiumphones before
10.12.3-digiumphones allows remote attackers to cause a denial of
service (NULL pointer dereference, segmentation fault, and daemon
crash) via an invalid SDP that defines a media description before the
connection description in a SIP request.
Note:References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
BUGTRAQ:20130827 AST-2013-005: Remote Crash when Invalid SDP is sent in SIP Request
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disclosed, or updated in CVE.
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