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[ GLSA 200905-01 ] Asterisk: Multiple vulnerabilities
From: Robert Buchholz <rbu () gentoo org>
Date: Sat, 2 May 2009 19:54:49 +0200

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Gentoo Linux Security Advisory                           GLSA 200905-01
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: Asterisk: Multiple vulnerabilities
      Date: May 02, 2009
      Bugs: #218966, #224835, #232696, #232698, #237476, #250748,
            #254304
        ID: 200905-01

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Synopsis
========

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

Background
==========

Asterisk is an open source telephony engine and toolkit.

Affected packages
=================

    -------------------------------------------------------------------
     Package            /  Vulnerable  /                    Unaffected
    -------------------------------------------------------------------
  1  net-misc/asterisk      < 1.2.32                         >= 1.2.32

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.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All Asterisk users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-misc/asterisk-1.2.32"

References
==========

  [ 1 ] CVE-2008-1897
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1897
  [ 2 ] CVE-2008-2119
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-2119
  [ 3 ] CVE-2008-3263
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-3263
  [ 4 ] CVE-2008-3264
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-3264
  [ 5 ] CVE-2008-3903
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-3903
  [ 6 ] CVE-2008-5558
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-5558
  [ 7 ] CVE-2009-0041
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0041

Availability
============

This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

  http://security.gentoo.org/glsa/glsa-200905-01.xml

Concerns?
=========

Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users machines is of utmost
importance to us. Any security concerns should be addressed to
security () gentoo org or alternatively, you may file a bug at
http://bugs.gentoo.org.

License
=======

Copyright 2009 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

http://creativecommons.org/licenses/by-sa/2.5

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