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Asterisk Project Security Advisory - AST-2011-014

Asterisk Project Security Advisory - AST-2011-014
Posted Dec 9, 2011
Authored by Terry Wilson | Site asterisk.org

Asterisk Project Security Advisory - Asterisk suffers from a denial of service vulnerability. 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.

tags | advisory, denial of service
MD5 | c865dbed9afc86ee7ba8ea5687f89b51

Asterisk Project Security Advisory - AST-2011-014

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               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@digium.com>
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
workaround.

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 1.6.2.21, 1.8.7.2

Patches
Download URL Revision
http://downloads.asterisk.org/pub/security/AST-2011-014-1.6.2.diff 1.6.2.20
http://downloads.asterisk.org/pub/security/AST-2011-014-1.8.diff 1.8.7.1

Links

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This document may be superseded by later versions; if so, the latest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

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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