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<?xml version="1.0" encoding="utf-8"?>
<glsa id="200410-31">
<title>Archive::Zip: Virus detection evasion</title>
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.
<product type="ebuild">Archive::Zip</product>
<announced>October 29, 2004</announced>
<revised>May 22, 2006: 02</revised>
<package name="dev-perl/Archive-Zip" auto="yes" arch="*">
<unaffected range="ge">1.14</unaffected>
<vulnerable range="lt">1.14</vulnerable>
Archive::Zip is a Perl module containing functions to handle ZIP
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 type="low">
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.
There is no known workaround at this time.
All Archive::Zip users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose &quot;&gt;=dev-perl/Archive-Zip-1.14&quot;</code>
<uri link="">iDEFENSE Security Advisory 10.18.04</uri>
<uri link=""> bug #8077</uri>
<uri link="">CVE-2004-1096</uri>
<metadata tag="requester" timestamp="Wed, 27 Oct 2004 12:10:39 +0000">
<metadata tag="bugReady" timestamp="Wed, 27 Oct 2004 12:10:53 +0000">
<metadata tag="submitter" timestamp="Fri, 29 Oct 2004 12:32:54 +0000">