<?xml version="1.0" encoding="utf-8"?> <!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd"> <glsa id="200410-31"> <title>Archive::Zip: Virus detection evasion</title> <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. </synopsis> <product type="ebuild">Archive::Zip</product> <announced>2004-10-29</announced> <revised count="02">2006-05-22</revised> <bug>68616</bug> <access>remote</access> <affected> <package name="dev-perl/Archive-Zip" auto="yes" arch="*"> <unaffected range="ge">1.14</unaffected> <vulnerable range="lt">1.14</vulnerable> </package> </affected> <background> <p> Archive::Zip is a Perl module containing functions to handle ZIP archives. </p> </background> <description> <p> 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. </p> </description> <impact type="low"> <p> 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. </p> </impact> <workaround> <p> There is no known workaround at this time. </p> </workaround> <resolution> <p> All Archive::Zip users should upgrade to the latest version: </p> <code> # emerge --sync # emerge --ask --oneshot --verbose ">=dev-perl/Archive-Zip-1.14"</code> </resolution> <references> <uri link="http://www.idefense.com/application/poi/display?id=153">iDEFENSE Security Advisory 10.18.04</uri> <uri link="https://rt.cpan.org/NoAuth/Bug.html?id=8077">rt.cpan.org bug #8077</uri> <uri link="https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-1096">CVE-2004-1096</uri> </references> <metadata tag="requester" timestamp="2004-10-27T12:10:39Z"> koon </metadata> <metadata tag="bugReady" timestamp="2004-10-27T12:10:53Z"> koon </metadata> <metadata tag="submitter" timestamp="2004-10-29T12:32:54Z"> koon </metadata> </glsa>