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[ GLSA 200410-31 ] Archive::Zip: Virus detection evasion
From: Thierry Carrez <koon () gentoo org>
Date: Fri, 29 Oct 2004 15:05:24 +0200

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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
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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