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TITLE:
Asterisk "BYE/Also" Denial of Service Vulnerability

SECUNIA ADVISORY ID:
SA28312

VERIFY ADVISORY:
http://secunia.com/advisories/28312/

CRITICAL:
Moderately critical

IMPACT:
DoS

WHERE:
>From remote

SOFTWARE:
Asterisk 1.x
http://secunia.com/product/2155/
Asterisk Appliance Developer Kit 0.x
http://secunia.com/product/14821/
Asterisk Business Edition 2.x
http://secunia.com/product/14820/

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 a null-pointer dereference error
within the handling of the "BYE/Also" transfer method and can be
exploited to crash the application.

Successful exploitation requires that a dialog has already been
established.

The vulnerability is reported in the following versions:
* Asterisk Open Source 1.4.x prior to version 1.4.17
* Asterisk Business Edition C.x.x prior to version C.1.0-beta8
* AsteriskNOW pre-release prior to beta7
* Asterisk Appliance Developer Kit prior to Asterisk 1.4 revision
95946
* s800i (Asterisk Appliance) 1.0.x prior to version 1.0.3.4

SOLUTION:
Asterisk Open Source:
Update to version 1.4.17:
http://downloads.digium.com/pub/telephony/asterisk

Asterisk Business Edition:
Fixed in version C.1.0

AsteriskNOW:
Fixed in Beta7
http://www.asterisknow.org/.

Asterisk Appliance Developer Kit:
Update to Asterisk 1.4 revision 95946.

s800i (Asterisk Appliance):
Update to version 1.0.3.4.

PROVIDED AND/OR DISCOVERED BY:
The vendor credits Grey VoIP.

ORIGINAL ADVISORY:
http://downloads.digium.com/pub/security/AST-2008-001.html

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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:
http://secunia.com/secunia_security_advisories/

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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