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UNIRAS Brief - 251/05 - Gentoo - Two Security Advisories [GLSA 200504-02,03]



 
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   UNIRAS (UK Govt CERT) Briefing Notice - 251/05 dated 04.04.05  Time: 15:05  
  UNIRAS is part of NISCC (National Infrastructure Security Co-ordination Centre)
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  UNIRAS material is also available from its website at www.uniras.gov.uk and
         Information about NISCC is available from www.niscc.gov.uk
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Title
=====

Gentoo - Two Security Advisories:
     1.  Sylpheed, Sylpheed-claws: Buffer overflow on message display [GLSA 200504-02]
     2.  Dnsmasq: Poisoning and Denial of Service vulnerabilities [GLSA 200504-03]


Detail
====== 

Security Advisory summaries:

     1.  Sylpheed and Sylpheed-claws contain a vulnerability that can be
         triggered when displaying messages with specially crafted attachments.

     2.  Dnsmasq does not properly detect that DNS replies received do not
         correspond to any DNS query that was sent. Rob Holland of the Gentoo
         Linux Security Audit team also discovered two off-by-one buffer
         overflows that could crash DHCP lease files parsing.


Security Advisory content follows:


1.


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Gentoo Linux Security Advisory                           GLSA 200504-02
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: Sylpheed, Sylpheed-claws: Buffer overflow on message
            display
      Date: April 02, 2005
      Bugs: #86541
        ID: 200504-02

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Synopsis
========

Sylpheed and Sylpheed-claws contain a vulnerability that can be
triggered when displaying messages with specially crafted attachments.

Background
==========

Sylpheed is a lightweight email client and newsreader. Sylpheed-claws
is a 'bleeding edge' version of Sylpheed.

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

    -------------------------------------------------------------------
     Package                     /  Vulnerable  /           Unaffected
    -------------------------------------------------------------------
  1  mail-client/sylpheed             < 1.0.4                 >= 1.0.4
  2  mail-client/sylpheed-claws       < 1.0.4                 >= 1.0.4
    -------------------------------------------------------------------
     2 affected packages on all of their supported architectures.
    -------------------------------------------------------------------

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

Sylpheed and Sylpheed-claws fail to properly handle messages containing
attachments with MIME-encoded filenames.

Impact
======

An attacker can send a malicious email message which, when displayed,
would cause the program to crash, potentially allowing the execution of
arbitrary code with the privileges of the user running the software.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All Sylpheed users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=mail-client/sylpheed-1.0.4"

All Sylpheed-claws users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=mail-client/sylpheed-claws-1.0.4"

References
==========

  [ 1 ] Sylpheed ChangeLog
        http://sylpheed.good-day.net/#changes

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

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

  http://security.gentoo.org/glsa/glsa-200504-02.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@xxxxxxxxxx or alternatively, you may file a bug at
http://bugs.gentoo.org.

License
=======

Copyright 2005 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/2.0



2.



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Gentoo Linux Security Advisory                           GLSA 200504-03
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                                            http://security.gentoo.org/
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  Severity: Low
     Title: Dnsmasq: Poisoning and Denial of Service vulnerabilities
      Date: April 04, 2005
      Bugs: #86718
        ID: 200504-03

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Synopsis
========

Dnsmasq is vulnerable to DNS cache poisoning attacks and a potential
Denial of Service from the local network.

Background
==========

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

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

    -------------------------------------------------------------------
     Package          /  Vulnerable  /                      Unaffected
    -------------------------------------------------------------------
  1  net-dns/dnsmasq       < 2.22                              >= 2.22

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

Dnsmasq does not properly detect that DNS replies received do not
correspond to any DNS query that was sent. Rob Holland of the Gentoo
Linux Security Audit team also discovered two off-by-one buffer
overflows that could crash DHCP lease files parsing.

Impact
======

A remote attacker could send malicious answers to insert arbitrary DNS
data into the Dnsmasq cache. These attacks would in turn help an
attacker to perform man-in-the-middle and site impersonation attacks.
The buffer overflows might allow an attacker on the local network to
crash Dnsmasq upon restart.

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-2.22"

References
==========

  [ 1 ] Dnsmasq Changelog
        http://www.thekelleys.org.uk/dnsmasq/CHANGELOG

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

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

  http://security.gentoo.org/glsa/glsa-200504-03.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@xxxxxxxxxx or alternatively, you may file a bug at
http://bugs.gentoo.org.

License
=======

Copyright 2005 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/2.0



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UNIRAS wishes to acknowledge the contributions of Gentoo for the information 
contained in this Briefing. 
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This Briefing contains the information released by the original author. Some 
of the information may have changed since it was released. If the vulnerability 
affects you, it may be prudent to retrieve the advisory from the canonical site 
to ensure that you receive the most current information concerning that problem.

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and has contacts with other international Incident Response Teams (IRTs) in 
order to foster cooperation and coordination in incident prevention, to prompt 
rapid reaction to incidents, and to promote information sharing amongst its 
members and the community at large. 
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<End of UNIRAS Briefing>

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______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please visit http://www.messagelabs.com/email 
______________________________________________________________________

______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please visit http://www.messagelabs.com/email 
______________________________________________________________________