AST-2013-005: Remote Crash When Invalid SDP Is Sent In SIP Request

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Asterisk Project Security Advisory – AST-2013-005

Product Asterisk
Summary Remote Crash when Invalid SDP is sent in SIP Request
Nature of Advisory Remote Crash
Susceptibility Remote Unauthenticated Sessions
Severity Major
Exploits Known None
Reported On July 03, 2013
Reported By Walter Doekes, OSSO B.V.
Posted On August 27, 2013
Last Updated On August 27, 2013
Advisory Contact Matthew Jordan
CVE Name Pending

Description A remotely exploitable crash vulnerability exists in the
SIP channel driver if an invalid SDP is sent in a SIP
request that defines media descriptions before connection
information. The handling code incorrectly attempts to
reference the socket address information even though that
information has not yet been set.

Resolution This patch adds checks when handling the various media
descriptions that ensures the media descriptions are handled
only if we have connection information suitable for that

Thanks to Walter Doekes of OSSO B.V. for finding, reporting,
testing, and providing the fix for this problem.

Affected Versions
Product Release Series
Asterisk Open Source 1.8.x All Versions
Asterisk Open Source 10.x All Versions
Asterisk Open Source 11.x All Versions
Certified Asterisk 1.8.15 All Versions
Certified Asterisk 11.2 All Versions
Asterisk with Digiumphones 10.x-digiumphones All Versions

Corrected In
Product Release
Asterisk Open Source, 10.12.3, 11.5.1
Certified Asterisk 1.8.15-cert3, 11.2-cert2
Asterisk with Digiumphones 10.12.3-digiumphones

SVN URL Revision Asterisk 1.8 Asterisk 10 Asterisk
10-digiumphones Asterisk 11 Certified
Asterisk 1.8.15 Certified
Asterisk 11.2


Asterisk Project Security Advisories are posted at

This document may be superseded by later versions; if so, the latest
version will be posted at and

Revision History
Date Editor Revisions Made
2013-08-27 Matt Jordan Initial Revision

Asterisk Project Security Advisory – AST-2013-005
Copyright (c) 2013 Digium, Inc. All Rights Reserved.
Permission is hereby granted to distribute and publish this advisory in its
original, unaltered form.