Asterisk: Two SIP Denial of Service vulnerabilities

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200704-01 / asterisk
Release Date	April 02, 2007
Latest Revision	April 02, 2007: 01
Impact	normal
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
net-misc/asterisk	< 1.2.14-r2	>= 1.2.14-r2, revision >= 1.0.12-r2	All supported architectures

Related bugreports: #171467

Synopsis

Asterisk is vulnerable to two Denial of Service issues in the SIP channel.

2. Impact Information

Background

Asterisk is an open source implementation of a telephone private branch exchange (PBX).

Description

The Madynes research team at INRIA has discovered that Asterisk contains a null pointer dereferencing error in the SIP channel when handling INVITE messages. Furthermore qwerty1979 discovered that Asterisk 1.2.x fails to properly handle SIP responses with return code 0.

Impact

A remote attacker could cause an Asterisk server listening for SIP messages to crash by sending a specially crafted SIP message or answering with a 0 return code.

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

Note: Asterisk 1.0.x is no longer supported upstream so users should consider upgrading to Asterisk 1.2.x.

4. References

Updated April 02, 2007

Summary: This is a Gentoo Linux Security Advisory

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