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[ GLSA 200804-06 ] UnZip: User-assisted execution of arbitrary code
From: Robert Buchholz <rbu () gentoo org>
Date: Sun, 6 Apr 2008 19:19:47 +0200

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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 () gentoo 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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