[ GLSA 200606-01 ] Opera: Buffer overflow

[Sune Kloppenborg Jeppesen <jaervosz () gentoo org>]

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Gentoo Linux Security Advisory                           GLSA 200606-01
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: Opera: Buffer overflow
      Date: June 07, 2006
      Bugs: #129800
        ID: 200606-01

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Synopsis
========

Opera contains an integer signedness error resulting in a buffer
overflow which may allow a remote attacker to execute arbitrary code.

Background
==========

Opera is a multi-platform web browser.

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

    -------------------------------------------------------------------
     Package           /  Vulnerable  /                     Unaffected
    -------------------------------------------------------------------
  1  www-client/opera       < 8.54                             >= 8.54

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

SEC Consult has discovered a buffer overflow in the code processing
style sheet attributes. It is caused by an integer signedness error in
a length check followed by a call to a string function. It seems to be
hard to exploit this buffer overflow to execute arbitrary code because
of the very large amount memory that has to be copied.

Impact
======

A remote attacker can entice a user to visit a web page containing a
specially crafted style sheet attribute that will crash the user's
browser and maybe lead to the execution of arbitrary code.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All Opera users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=www-client/opera-8.54"

References
==========

  [ 1 ] CVE-2006-1834
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-1834

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

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

  http://security.gentoo.org/glsa/glsa-200606-01.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 2006 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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