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Category:   Application (Generic)  >   Zlib Vendors:   GNU [multiple authors]
(Gentoo Issues Fix) Zlib Buffer Overflow in inflate_table() May Let Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1014403
SecurityTracker URL:  http://securitytracker.com/id/1014403
CVE Reference:   CVE-2005-2096   (Links to External Site)
Date:  Jul 6 2005
Impact:   Denial of service via network, Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 1.2.2
Description:   A buffer overflow was reported in zlib in the processing of compressed data streams. A remote user may be able to cause denial of service conditions or execute arbitrary code on the target system.

A user can create a specially crafted compressed data stream that, when processed by an application using zlib, will trigger an overflow in the inflate_table() function and cause the application to crash or execute arbitrary code.

The vulnerability resides in 'inftrees.c'.

Tavis Ormandy of the Gentoo Linux Security Audit Team discovered this vulnerability.

Impact:   A user can cause an application using zlib to crash or execute arbitrary code. The specific impact depends on the application.
Solution:   Gentoo has issued a fix and indicates that all zlib users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose ">=sys-libs/zlib-1.2.2-r1"

Vendor URL:  www.zlib.org/ (Links to External Site)
Cause:   Boundary error
Underlying OS:  Linux (Gentoo)

Message History:   This archive entry is a follow-up to the message listed below.
Jul 6 2005 Zlib Buffer Overflow in inflate_table() May Let Remote Users Execute Arbitrary Code



 Source Message Contents

Subject:  [Full-disclosure] [ GLSA 200507-05 ] zlib: Buffer overflow


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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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_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
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