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Gentoo Linux Security Advisory                           GLSA 200507-28
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                                            http://security.gentoo.org/
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  Severity: High
     Title: AMD64 x86 emulation base libraries: Buffer overflow
      Date: July 30, 2005
      Bugs: #100686
        ID: 200507-28

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Synopsis
========

The x86 emulation base libraries for AMD64 contain a vulnerable version
of zlib which could potentially lead to execution of arbitrary code.

Background
==========

The x86 emulation base libraries for AMD64 emulate the x86 (32-bit)
architecture on the AMD64 (64-bit) architecture.

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

    -------------------------------------------------------------------
     Package                  /  Vulnerable  /              Unaffected
    -------------------------------------------------------------------
  1  emul-linux-x86-baselibs        < 2.2                       >= 2.2
    -------------------------------------------------------------------
     # Package 1 only applies to AMD64 users.

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

Earlier versions of emul-linux-x86-baselibs contain a vulnerable
version of zlib, which may lead to a buffer overflow.

Impact
======

By creating a specially crafted compressed data stream, attackers can
overwrite data structures for applications that use the x86 emulation
base libraries for AMD64, resulting in a Denial of Service and
potentially arbitrary code execution.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All AMD64 x86 emulation base libraries users should upgrade to the
latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose
">=app-emulation/emul-linux-x86-baselibs-2.2"

References
==========

  [ 1 ] GLSA 200507-05
        http://www.gentoo.org/security/en/glsa/glsa-200507-05.xml
  [ 2 ] GLSA 200507-19
        http://www.gentoo.org/security/en/glsa/glsa-200507-19.xml
  [ 3 ] CAN-2005-1849
        http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-1849
  [ 4 ] CAN-2005-2096
        http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-2096

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

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

  http://security.gentoo.org/glsa/glsa-200507-28.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 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