Date: Fri, 29 Oct 2004 15:05:24 +0200
From: Thierry Carrez <[email protected]>
To: [email protected]Subject: [ GLSA 200410-31 ] Archive::Zip: Virus detection evasion
Cc: [email protected], [email protected],
[email protected]
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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
=================
-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
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
[email protected] 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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