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<?xml version="1.0" encoding="utf-8"?>
<glsa id="200704-01">
<title>Asterisk: Two SIP Denial of Service vulnerabilities</title>
Asterisk is vulnerable to two Denial of Service issues in the SIP channel.
<product type="ebuild">asterisk</product>
<announced>April 02, 2007</announced>
<revised>April 02, 2007: 01</revised>
<package name="net-misc/asterisk" auto="yes" arch="*">
<unaffected range="ge">1.2.14-r2</unaffected>
<unaffected range="rge">1.0.12-r2</unaffected>
<vulnerable range="lt">1.2.14-r2</vulnerable>
Asterisk is an open source implementation of a telephone private branch
exchange (PBX).
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
<impact type="normal">
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.
There is no known workaround at this time.
All Asterisk users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose net-misc/asterisk</code>
Note: Asterisk 1.0.x is no longer supported upstream so users should
consider upgrading to Asterisk 1.2.x.
<uri link="">CVE-2007-1561</uri>
<uri link="">CVE-2007-1594</uri>
<metadata tag="submitter" timestamp="Tue, 20 Mar 2007 20:55:47 +0000">
<metadata tag="bugReady" timestamp="Mon, 02 Apr 2007 16:33:39 +0000">