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

===========================================================================
             AUSCERT External Security Bulletin Redistribution

                       ESB-2008.0857 -- [UNIX/Linux]
                dnsmasq: Denial of Service and DNS spoofing
                             5 September 2008

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:              dnsmasq
Publisher:            Gentoo
Operating System:     Gentoo
                      UNIX variants (UNIX, Linux)
Impact:               Denial of Service
                      Provide Misleading Information
Access:               Remote/Unauthenticated
CVE Names:            CVE-2008-3350 CVE-2008-1447

Ref:                  AL-2008.0080

Original Bulletin:    http://security.gentoo.org/glsa/glsa-200809-02.xml

Comment: This advisory references vulnerabilities in products which run on
         platforms other than Gentoo. It is recommended that administrators
         running dnsmasq check for an updated version of the software for
         their operating system.

- --------------------------BEGIN INCLUDED TEXT--------------------

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Gentoo Linux Security Advisory                           GLSA 200809-02
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
                                            http://security.gentoo.org/
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

  Severity: Normal
     Title: dnsmasq: Denial of Service and DNS spoofing
      Date: September 04, 2008
      Bugs: #231282, #232523
        ID: 200809-02

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

Synopsis
========

Two vulnerabilities in dnsmasq might allow for a Denial of Service or
spoofing of DNS replies.

Background
==========

Dnsmasq is a lightweight and easily-configurable DNS forwarder and DHCP
server.

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

    -------------------------------------------------------------------
     Package          /  Vulnerable  /                      Unaffected
    -------------------------------------------------------------------
  1  net-dns/dnsmasq       < 2.45                              >= 2.45

Description
===========

* Dan Kaminsky of IOActive reported that dnsmasq does not randomize
  UDP source ports when forwarding DNS queries to a recursing DNS
  server (CVE-2008-1447).

* Carlos Carvalho reported that dnsmasq in the 2.43 version does not
  properly handle clients sending inform or renewal queries for unknown
  DHCP leases, leading to a crash (CVE-2008-3350).

Impact
======

A remote attacker could send spoofed DNS response traffic to dnsmasq,
possibly involving generating queries via multiple vectors, and spoof
DNS replies, which could e.g. lead to the redirection of web or mail
traffic to malicious sites. Furthermore, an attacker could generate
invalid DHCP traffic and cause a Denial of Service.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All dnsmasq users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-dns/dnsmasq-2.45"

References
==========

  [ 1 ] CVE-2008-3350
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-3350
  [ 2 ] CVE-2008-1447
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1447

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

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

  http://security.gentoo.org/glsa/glsa-200809-02.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

- --------------------------END INCLUDED TEXT--------------------

You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.

NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members.  As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.

NOTE: This is only the original release of the security bulletin.  It may
not be updated when updates to the original are made.  If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.

Contact information for the authors of the original document is included
in the Security Bulletin above.  If you have any questions or need further
information, please contact them directly.

Previous advisories and external security bulletins can be retrieved from:

        http://www.auscert.org.au/render.html?cid=1980

If you believe that your computer system has been compromised or attacked in 
any way, we encourage you to let us know by completing the secure National IT 
Incident Reporting Form at:

        http://www.auscert.org.au/render.html?it=3192

===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
===========================================================================

-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967

iQCVAwUBSMB0Jyh9+71yA2DNAQIukgP/VYsFq0GBbdJsmGNgytzdzE1pGCWNTxNN
JkFoLNdDjhIcL2wB07R2Lin5zoxVtqmhXoDGASQBsN+9H6zk3ocmcGxy13bq4SdA
EGHm50ICNn4I16I4Yu9/WkpS0ncUkMSB67oRTfAZaSitInK9zkMUpcOLTHBtKY5m
5MRWRYAu3+A=
=eIyB
-----END PGP SIGNATURE-----