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Gentoo Linux Security Advisory                           GLSA 200507-19
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                                            http://security.gentoo.org/
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  Severity: High
     Title: zlib: Buffer overflow
      Date: July 22, 2005
      Bugs: #99751
        ID: 200507-19

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Synopsis
========

zlib is vulnerable to a buffer overflow which could potentially lead to
execution of arbitrary code.

Background
==========

zlib is a widely used free and patent unencumbered data compression
library.

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

    -------------------------------------------------------------------
     Package        /  Vulnerable  /                        Unaffected
    -------------------------------------------------------------------
  1  sys-libs/zlib       < 1.2.3                              >= 1.2.3

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

zlib improperly handles invalid data streams which could lead to a
buffer overflow.

Impact
======

By creating a specially crafted compressed data stream, attackers can
overwrite data structures for applications that use zlib, resulting in
arbitrary code execution or a Denial of Service.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All zlib users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=sys-libs/zlib-1.2.3"

References
==========

  [ 1 ] Full Disclosure Announcement
        http://archives.neohapsis.com/archives/fulldisclosure/2005-07/0489.html
  [ 2 ] CAN-2005-1849
        http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-1849

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

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

  http://security.gentoo.org/glsa/glsa-200507-19.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

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