Asterisk IAX2 Multiple Method Handshake Spoofing DoS

This script is Copyright (C) 2008-2013 Tenable Network Security, Inc.


Synopsis :

The remote VoIP service can be abused to conduct an amplification
attack against third-party hosts.

Description :

The version of Asterisk installed on the remote host does not properly
validate an IAX2 handshake. By spoofing NEW and ACK messages, an
unauthenticated, remote attacker may be able to leverage this issue to
flood a third-party host with packets from the affected host containing
audio data.

See also :

https://www.altsci.com/concepts/page.php?s=asteri&p=2
http://bugs.digium.com/view.php?id=10078
http://archives.neohapsis.com/archives/bugtraq/2008-04/0292.html

Solution :

Upgrade to Asterisk 1.4.20 / 1.2.28, Asterisk Business Edition C.1.8.1
/ B.2.5.2, AsteriskNOW 1.0.3, s800i (Asterisk Appliance) 1.1.0.3 or
later.

Risk factor :

Medium / CVSS Base Score : 5.0
(CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P)
CVSS Temporal Score : 4.1
(CVSS2#E:F/RL:OF/RC:C)
Public Exploit Available : true

Family: Denial of Service

Nessus Plugin ID: 32132 (asterisk_iax2_spoofed_handshake.nasl)

Bugtraq ID: 28901

CVE ID: CVE-2008-1897
CVE-2008-1923