[Full-disclosure] [ GLSA 200507-19 ] zlib: Buffer overflow

[Sune Kloppenborg Jeppesen]

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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 at 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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