GLSA 200410-31: Archive::Zip: Virus detection evasion
Posted on: 10/29/2004 06:25 PM

An Archive::Zip update is available for Gentoo Linux

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Gentoo Linux Security Advisory GLSA 200410-31
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http://security.gentoo.org/
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Severity: Low
Title: Archive::Zip: Virus detection evasion
Date: October 29, 2004
Bugs: #68616
ID: 200410-31

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Synopsis
=======

Email virus scanning software relying on Archive::Zip can be fooled into thinking a ZIP attachment is empty while it contains a virus, allowing detection evasion.

Background
=========

Archive::Zip is a Perl module containing functions to handle ZIP archives.

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

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Package / Vulnerable / Unaffected
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1 dev-perl/Archive-Zip < 1.14 >= 1.14

Description
==========

Archive::Zip can be used by email scanning software (like amavisd-new) to uncompress attachments before virus scanning. By modifying the uncompressed size of archived files in the global header of the ZIP file, it is possible to fool Archive::Zip into thinking some files inside the archive have zero length.

Impact
=====

An attacker could send a carefully crafted ZIP archive containing a virus file and evade detection on some email virus-scanning software relying on Archive::Zip for decompression.

Workaround
=========

There is no known workaround at this time.

Resolution
=========

All Archive::Zip users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose ">=dev-perl/Archive-Zip-1.14"

References
=========

[ 1 ] iDEFENSE Security Advisory 10.18.04
http://www.idefense.com/application/poi/display?id=153
[ 2 ] rt.cpan.org bug #8077
http://rt.cpan.org/NoAuth/Bug.html?id=8077

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

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

http://security.gentoo.org/glsa/glsa-200410-31.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 2004 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/1.0


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