Asterisk: Multiple vulnerabilities

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200905-01 / asterisk
Release Date	May 02, 2009
Latest Revision	May 02, 2009: 01
Impact	normal
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
net-misc/asterisk	< 1.2.32	>= 1.2.32	All supported architectures

Related bugreports: #218966, #224835, #232696, #232698, #237476, #250748, #254304

Synopsis

Multiple vulnerabilities have been found in Asterisk allowing for Denial of Service and username disclosure.

2. Impact Information

Background

Asterisk is an open source telephony engine and toolkit.

Description

Multiple vulnerabilities have been discovered in the IAX2 channel driver when performing the 3-way handshake (CVE-2008-1897), when handling a large number of POKE requests (CVE-2008-3263), when handling authentication attempts (CVE-2008-5558) and when handling firmware download (FWDOWNL) requests (CVE-2008-3264). Asterisk does also not correctly handle SIP INVITE messages that lack a "From" header (CVE-2008-2119), and responds differently to a failed login attempt depending on whether the user account exists (CVE-2008-3903, CVE-2009-0041).

Impact

Remote unauthenticated attackers could send specially crafted data to Asterisk, possibly resulting in a Denial of Service via a daemon crash, call-number exhaustion, CPU or traffic consumption. Remote unauthenticated attackers could furthermore enumerate valid usernames to facilitate brute force login attempts.

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-1.2.32"

4. References

Updated May 02, 2009

Summary: This is a Gentoo Linux Security Advisory

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