full-disclosure - [ GLSA 200804-06 ] UnZip: User-assisted execution of arbitrary code

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Date: Sun, 6 Apr 2008 19:19:47 +0200
From: Robert Buchholz <rbu@...too.org>
To: gentoo-announce@...too.org
Cc: full-disclosure@...ts.grok.org.uk, bugtraq@...urityfocus.com,
	security-alerts@...uxsecurity.com
Subject: [ GLSA 200804-06 ] UnZip: User-assisted execution
	of arbitrary code

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Gentoo Linux Security Advisory                           GLSA 200804-06
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: UnZip: User-assisted execution of arbitrary code
      Date: April 06, 2008
      Bugs: #213761
        ID: 200804-06

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Synopsis
========

A double free vulnerability discovered in UnZip might lead to the
execution of arbitrary code.

Background
==========

Info-ZIP's UnZip is a tool to list and extract files inside PKZIP
compressed files.

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

    -------------------------------------------------------------------
     Package         /  Vulnerable  /                       Unaffected
    -------------------------------------------------------------------
  1  app-arch/unzip      < 5.52-r2                          >= 5.52-r2

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

Tavis Ormandy of the Google Security Team discovered that the NEEDBITS
macro in the inflate_dynamic() function in the file inflate.c can be
invoked using invalid buffers, which can lead to a double free.

Impact
======

Remote attackers could entice a user or automated system to open a
specially crafted ZIP file that might lead to the execution of
arbitrary code or a Denial of Service.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All UnZip users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=app-arch/unzip-5.52-r2"

References
==========

  [ 1 ] CVE-2008-0888
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-0888

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

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

  http://security.gentoo.org/glsa/glsa-200804-06.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@...too.org or alternatively, you may file a bug at
http://bugs.gentoo.org.

License
=======

Copyright 2008 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/2.5

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