Asterisk IAX2 Multiple Method Handshake Spoofing DoS

medium Nessus Plugin ID 32132
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Synopsis

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

Description

The version of Asterisk running 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.

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.

See Also

https://www.altsci.com/concepts/page.php?s=asteri&p=2

http://bugs.digium.com/view.php?id=10078

https://seclists.org/bugtraq/2008/Apr/252

Plugin Details

Severity: Medium

ID: 32132

File Name: asterisk_iax2_spoofed_handshake.nasl

Version: 1.21

Type: remote

Published: 5/6/2008

Updated: 11/15/2018

Dependencies: iax2_detection.nasl

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P

Temporal Vector: E:U/RL:OF/RC:C

Vulnerability Information

CPE: cpe:/a:asterisk:open_source

Required KB Items: Services/udp/iax2

Exploit Ease: No known exploits are available

Patch Publication Date: 4/22/2008

Reference Information

CVE: CVE-2008-1897, CVE-2008-1923

BID: 28901

Secunia: 29927

CWE: 16, 287