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Gentoo Linux Security Advisory                           GLSA 200507-05
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                                            http://security.gentoo.org/
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  Severity: High
     Title: zlib: Buffer overflow
      Date: July 06, 2005
      Bugs: #98121
        ID: 200507-05

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Synopsis
========

A buffer overflow has been discovered in zlib, potentially resulting in
the 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     < 1.2.2-r1                          >= 1.2.2-r1

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

Tavis Ormandy of the Gentoo Linux Security Audit Team discovered a
buffer overflow in zlib. A bounds checking operation failed to take
invalid data into account, allowing a specifically malformed deflate
data stream to overrun a buffer.

Impact
======

An attacker could construct a malformed data stream, embedding it
within network communication or an application file format, potentially
resulting in the execution of arbitrary code when decoded by the
application using the zlib library.

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-1.2.2-r1"

References
==========

  [ 1 ] 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-200507-05.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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