AST-2011-014: Remote crash possibility with SIP and the â??automonâ? feature enabled Dec 08 2011 10:48PM
Asterisk Security Team (security asterisk org)
Asterisk Project Security Advisory - AST-2011-014

Product Asterisk
Summary Remote crash possibility with SIP and the "automon"
feature enabled
Nature of Advisory Remote crash vulnerability in a feature that is
disabled by default
Susceptibility Remote unauthenticated sessions
Severity Moderate
Exploits Known Yes
Reported On November 2, 2011
Reported By Kristijan Vrban
Posted On 2011-11-03
Last Updated On December 7, 2011
Advisory Contact Terry Wilson <twilson (at) digium (dot) com [email concealed]>
CVE Name

Description When the "automon" feature is enabled in features.conf, it
is possible to send a sequence of SIP requests that cause
Asterisk to dereference a NULL pointer and crash.

Resolution Applying the referenced patches that check that the pointer
is not NULL before accessing it will resolve the issue. The
"automon" feature can be disabled in features.conf as a

Affected Versions
Product Release Series
Asterisk Open Source 1.6.2.x All versions
Asterisk Open Source 1.8.x All versions

Corrected In
Product Release
Asterisk Open Source,

Download URL Revision


Asterisk Project Security Advisories are posted at

This document may be superseded by later versions; if so, the latest
version will be posted at
http://downloads.digium.com/pub/security/AST-2011-014.pdf and

Revision History
Date Editor Revisions Made

Asterisk Project Security Advisory - AST-2011-014
Copyright (c) 2011 Digium, Inc. All Rights Reserved.
Permission is hereby granted to distribute and publish this advisory in its
original, unaltered form.

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