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TITLE:
Asterisk IAX2 Channel Driver Denial of Service

SECUNIA ADVISORY ID:
SA26274

VERIFY ADVISORY:
http://secunia.com/advisories/26274/

CRITICAL:
Less critical

IMPACT:
DoS

WHERE:
>From local network

SOFTWARE:
Asterisk 1.x
http://secunia.com/product/2155/
Asterisk Appliance Developer Kit 0.x
http://secunia.com/product/14821/

DESCRIPTION:
A vulnerability has been reported in Asterisk, which can be exploited
by malicious people to cause a DoS (Denial of Service).

The vulnerability is caused due to the IAX2 Channel Driver improperly
processing "NEW" packets. This can be exploited to allocate resources
that are never freed by sending multiple "NEW" packets for valid
extensions to the server.

Successful exploitation results in a DoS, but requires that the IAX2
Channel Driver is configured to allow unauthenticated calls.

The vulnerability is reported in the following products:
Asterisk Open Source 1.2.x version 1.2.20,  1.2.21, 1.2.21.1, and
1.2.22
Asterisk Open Source 1.4.x version 1.4.5, 1.4.7, 1.4.7.1 and 1.4.8
AsteriskNOW pre-release version beta6
Asterisk Appliance Developer Kit 0.5.0
s800i versions 1.0.0-beta5 to 1.0.2.

SOLUTION:
Asterisk Open Source 1.2.x:
Update to version 1.2.23.
ftp://ftp.digium.com/pub/telephony/asterisk

Asterisk Open Source 1.4.x:
Update to version 1.4.9.
ftp://ftp.digium.com/pub/telephony/asterisk

AsteriskNOW pre-release:
Update to version beta7.
http://www.asterisknow.org

Asterisk Appliance Developer Kit:
Update to version 0.6.0.
ftp://ftp.digium.com/pub/telephony/aadk

s800i:
Update to version 1.0.3.

PROVIDED AND/OR DISCOVERED BY:
Russel Bryant

ORIGINAL ADVISORY:
http://ftp.digium.com/pub/asa/ASA-2007-018.pdf

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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

Subscribe:
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Definitions: (Criticality, Where etc.)
http://secunia.com/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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