Asterisk: Multiple vulnerabilities

Security Team Contact Address

Updated February 26, 2008

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200802-11 / asterisk
Release Date	February 26, 2008
Latest Revision	February 26, 2008: 01
Impact	high
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
net-misc/asterisk	< 1.2.21.1-r1	revision >= 1.2.17-r1, >= 1.2.21.1-r1	All supported architectures

Related bugreports: #185713

Synopsis

Multiple vulnerabilities have been found in Asterisk.

2. Impact Information

Background

Asterisk is an open source telephony engine and tool kit.

Description

Multiple vulnerabilities have been found in Asterisk:

Russel Bryant reported a stack buffer overflow in the IAX2 channel driver (chan_iax2) when bridging calls between chan_iax2 and any channel driver that uses RTP for media (CVE-2007-3762).
Chris Clark and Zane Lackey (iSEC Partners) reported a NULL pointer dereference in the IAX2 channel driver (chan_iax2) (CVE-2007-3763).
Will Drewry (Google Security) reported a vulnerability in the Skinny channel driver (chan_skinny), resulting in an overly large memcpy (CVE-2007-3764).
Will Drewry (Google Security) reported a vulnerability in the IAX2 channel driver (chan_iax2), that does not correctly handle unauthenticated transactions using a 3-way handshake (CVE-2007-4103).

Impact

By sending a long voice or video RTP frame, a remote attacker could possibly execute arbitrary code on the target machine. Sending specially crafted LAGRQ or LAGRP frames containing information elements of IAX frames, or a certain data length value in a crafted packet, or performing a flood of calls not completing a 3-way handshake, could result in a Denial of Service.

3. Resolution Information

Workaround

There is no known workaround at this time.

Resolution

All Asterisk users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=net-misc/asterisk-1.2.17-r1"

4. References