From: Secunia Security Advisories (sec-advsecunia.com)
Date: Wed Jul 18 2007 - 16:17:06 CDT

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TITLE:
Asterisk Multiple Vulnerabilities

SECUNIA ADVISORY ID:
SA26099

VERIFY ADVISORY:
http://secunia.com/advisories/26099/

CRITICAL:
Highly critical

IMPACT:
DoS, System access

WHERE:
From remote

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

DESCRIPTION:
Some vulnerabilities have been reported in Asterisk, which can be
exploited by malicious people to cause a DoS (Denial of Service) and
potentially compromise a vulnerable system.

1) A boundary error exists in the Asterisk STUN implementation, which
can be exploited to cause the application to crash via specially
crafted RTP packets.

Successful exploitation requires that the chan_sip, chan_gtalk,
chan_jingle, chan_h323, chan_mgcp, or chan_skinny is enabled.

The vulnerability is reported in the following products:
Asterisk Open Source 1.4.x prior to version 1.4.8
AsteriskNOW pre-release prior to version beta7
Asterisk Appliance Developer Kit prior to version 0.5.0
s800i 1.0.x prior to version 1.0.2.
  
2) A boundary error exists in the Asterisk Skinny channel driver
(chan_skinny), which can be exploited to cause the application to
crash via packets that contain a size field smaller than the actual
size of the packet.

Successful exploitation requires that chan_skinny is enabled.

3) A NULL-pointer dereference error exists in the Asterisk IAX2
channel driver (chan_iax2), which can be exploited to cause a DoS via
specially crafted LGRQ and LAGRP frames.

Successful exploitation requires that chan_iax is enabled.

4) A boundary error exists in the Asterisk IAX2 channel driver
(chan_iax2) within the handling of RTP frames. This can be exploited
to cause a stack-based buffer overflow by sending large data payloads
(more than 4096 bytes) in a voice or video frame.

Successful exploitation of this vulnerability allows execution of
arbitrary code, but requires that the system is configured to connect
channels that use RTP and IAX channels.

Vulnerabilities #2, #3, and #4 are reported in the following
products:
Asterisk Open Source 1.0.x
Asterisk Open Source 1.2.x prior to version 1.2.22
Asterisk Open Source 1.4.x prior to version 1.4.8
AsteriskNOW pre-release prior to version beta7
Asterisk Business Edition A.x.x
Asterisk Business Edition B.x.x prior to version B.2.2.1
Asterisk Appliance Developer Kit prior to version 0.5.0
s800i 1.0.x prior to version 1.0.2.

SOLUTION:
Asterisk Open Source 1.2.x:
Update to version 1.2.22.
ftp://ftp.digium.com/pub/telephony/asterisk

Asterisk Open Source 1.4.x:
Update to version 1.4.8.
ftp://ftp.digium.com/pub/telephony/asterisk

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

Asterisk Business Edition B.x.x:
Update to version B.2.2.1.
http://www.digium.com

Asterisk Appliance Developer Kit:
Update to version 0.5.0.
ftp://ftp.digium.com/pub/telephony/aadk

s800i:
Update to version 1.0.2.

PROVIDED AND/OR DISCOVERED BY:
The vendor credits:
1) and 2) Will Drewry, Google Security Team
3) Chris Clark and Zane Lackey, iSEC Partners
4) Russel Bryant

ORIGINAL ADVISORY:
1) http://ftp.digium.com/pub/asa/ASA-2007-017.pdf
2) http://ftp.digium.com/pub/asa/ASA-2007-016.pdf
3) http://ftp.digium.com/pub/asa/ASA-2007-015.pdf
4) http://ftp.digium.com/pub/asa/ASA-2007-014.pdf

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