Asterisk IAX2 FWDOWNL Request Spoofing Remote 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 firmware download protocol implemented in the version of Asterisk
installed on the remote host does not initiate a handshake. By spoofing
an IAX2 FWDOWNL request, an unauthenticated, remote attacker may be able
to leverage this issue to flood a third-party host with unwanted
firmware packets from the affected host.

See also :

http://downloads.digium.com/pub/security/AST-2008-011.html
http://www.securityfocus.com/archive/1/494676/30/0/threaded

Solution :

Upgrade to Asterisk Open Source 1.4.21.2 / 1.2.30, Asterisk Business
Edition C.2.0.3 / C.1.10.3 / B.2.5.4, s800i (Asterisk Appliance) 1.2.0.1
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: 33564 (asterisk_iax2_spoofed_fwdownl.nasl)

Bugtraq ID: 30350

CVE ID: CVE-2008-3264