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<?xml version="1.0" encoding="UTF-8"?>
<glsa id="201203-05">
<title>Rack: Denial of Service</title>
<synopsis>A hash collision vulnerability in Rack allows remote attackers to
cause a Denial of Service condition.
<product type="ebuild">rack</product>
<announced>March 06, 2012</announced>
<revised>March 06, 2012: 1</revised>
<package name="dev-ruby/rack" auto="yes" arch="*">
<unaffected range="ge">1.1.3</unaffected>
<vulnerable range="lt">1.1.3</vulnerable>
<p>Rack is a modular Ruby web server interface.</p>
<p>Rack does not properly randomize hash functions to protect against hash
collision attacks.
<impact type="normal">
<p>A remote attacker could send a specially crafted form post, possibly
resulting in a Denial of Service condition.
<p>There is no known workaround at this time.</p>
<p>All Rack users should upgrade to the latest version:</p>
# emerge --sync
# emerge --ask --oneshot --verbose "&gt;=dev-ruby/rack-1.1.3"
<uri link="">CVE-2011-5036</uri>
<metadata timestamp="Sun, 04 Mar 2012 21:22:25 +0000" tag="requester">ackle</metadata>
<metadata timestamp="Tue, 06 Mar 2012 01:05:34 +0000" tag="submitter">ackle</metadata>