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Asterisk Project Security Advisory - AST-2014-005

Product Asterisk
Summary Remote Crash in PJSIP Channel Driver's
Publish/Subscribe Framework
Nature of Advisory Denial of Service
Susceptibility Remote Unauthenticated Sessions
Severity Moderate
Exploits Known No
Reported On March 17, 2014
Reported By John Bigelow <jbigelow AT digium DOT com>
Posted On June 12, 2014
Last Updated On June 12, 2014
Advisory Contact Kevin Harwell <kharwell AT digium DOT com>
CVE Name CVE-2014-4045

Description A remotely exploitable crash vulnerability exists in the
PJSIP channel driver's pub/sub framework. If an attempt is
made to unsubscribe when not currently subscribed and the
endpoint's "sub_min_expiry" is set to zero, Asterisk tries
to create an expiration timer with zero seconds, which is
not allowed, so an assertion raised.

Resolution Upgrade to a version with the patch integrated, apply the
patch, or make sure the "sub_min_expiry" endpoint
configuration option is greater than zero.

Affected Versions
Product Release Series
Asterisk Open Source 12.x All

Corrected In
Product Release
Asterisk Open Source 12.x 12.3.1

Patches
SVN URL Revision
http://downloads.asterisk.org/pub/security/AST-2014-005-12.diff Asterisk
12

Links https://issues.asterisk.org/jira/browse/ASTERISK-23489

Asterisk Project Security Advisories are posted at
http://www.asterisk.org/security

This document may be superseded by later versions; if so, the latest
version will be posted at
http://downloads.digium.com/pub/security/AST-2014-005.pdf and
http://downloads.digium.com/pub/security/AST-2014-005.html

Revision History
Date Editor Revisions Made
April 14, 2014 Kevin Harwell Document Creation
June 12, 2014 Matt Jordan Added CVE

Asterisk Project Security Advisory - AST-2014-005
Copyright (c) 2014 Digium, Inc. All Rights Reserved.
Permission is hereby granted to distribute and publish this advisory in its
original, unaltered form.


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