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TITLE:
Asterisk Two Denial of Service Vulnerabilities

SECUNIA ADVISORY ID:
SA31178

VERIFY ADVISORY:
http://secunia.com/advisories/31178/

CRITICAL:
Less critical

IMPACT:
DoS

WHERE:
>From local network

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

DESCRIPTION:
Two vulnerabilities have been reported in Asterisk, which can be
exploited by malicious people to cause a DoS (Denial of Service) or
to conduct DoS attacks.

1) An error in the processing of IAX2 "POKE" requests can be
exploited to consume all IAX2 call numbers via multiple "POKE"
requests lacking an "ACK" packet sent in response to a "PONG"
packet.

2) The firmware download protocol does not require a handshake, which
can be exploited to send packets having 1040 bytes to arbitrary
servers via a 40-byte packet with a spoofed source address.

The vulnerabilities are reported in the following products and
versions:
* Asterisk Open Source 1.0.x (all versions)
* Asterisk Open Source 1.2.x (all versions prior to 1.2.30)
* Asterisk Open Source 1.4.x (all versions prior to 1.4.21.2)
* Asterisk Business Edition A.x.x (all versions)
* Asterisk Business Edition B.x.x.x (all versions prior to B.2.5.4)
* Asterisk Business Edition C.x.x.x (all versions prior to C.1.10.3)
* AsteriskNOW pre-release (all versions)
* Asterisk Appliance Developer Kit 0.x.x (all versions)
* s800i (Asterisk Appliance) 1.0.x (all versions prior to 1.2.0.1)

SOLUTION:
Asterisk Open Source 1.2.x:
Update to version 1.2.30.

Asterisk Open Source 1.4.x:
Update to version 1.4.21.2.

Asterisk Business Edition B.x.x.x:
Update to version B.2.5.4.

Asterisk Business Edition C.x.x.x:
Update to version C.1.10.3.

s800i (Asterisk Appliance) 1.0.x:
Update to version 1.2.0.1.

PROVIDED AND/OR DISCOVERED BY:
1) The vendor credits Jeremy McNamara.
2) Tilghman Lesher, Digium

ORIGINAL ADVISORY:
http://downloads.digium.com/pub/security/AST-2008-010.html
http://downloads.digium.com/pub/security/AST-2008-011.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.

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