[ GLSA 200802-11 ] Asterisk: Multiple vulnerabilities

[Pierre-Yves Rofes <py () gentoo org>]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Gentoo Linux Security Advisory                           GLSA 200802-11
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
                                            http://security.gentoo.org/
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

  Severity: High
     Title: Asterisk: Multiple vulnerabilities
      Date: February 26, 2008
      Bugs: #185713
        ID: 200802-11

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Synopsis
========

Multiple vulnerabilities have been found in Asterisk.

Background
==========

Asterisk is an open source telephony engine and tool kit.

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

    -------------------------------------------------------------------
     Package            /    Vulnerable    /                Unaffected
    -------------------------------------------------------------------
  1  net-misc/asterisk      < 1.2.21.1-r1                *>= 1.2.17-r1
                                                        >= 1.2.21.1-r1

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.

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-1.2.17-r1"

References
==========

  [ 1 ] CVE-2007-3762
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-3762
  [ 2 ] CVE-2007-3763
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-3763
  [ 3 ] CVE-2007-3764
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-3764
  [ 4 ] CVE-2007-4103
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-4103

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

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

  http://security.gentoo.org/glsa/glsa-200802-11.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 2008 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
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2.0.7 (GNU/Linux)
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org

iD8DBQFHxJrnuhJ+ozIKI5gRAj24AJ9B/dpuczuQcgSUyADZOo0qWaZCJACfUiEF
rruqvLgqJy68eyibCHnBz6M=
=jW6E
-----END PGP SIGNATURE-----