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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