GLSA 200804-06 UnZip: User-assisted execution of arbitrary code
Posted on: 04/06/2008 06:40 PM

A new security update has been released for Gentoo Linux - UnZip: User-assisted execution of arbitrary code. Here the announcement:

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 lt; 5.52-r2 gt;= 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 "gt;=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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