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<?xml version="1.0" encoding="UTF-8"?>
<glsa id="201207-06">
<title>JRuby: Denial of Service</title>
<synopsis>A hash collision vulnerability in JRuby allows remote attackers to
cause a Denial of Service condition.
<product type="ebuild">jruby</product>
<announced>July 09, 2012</announced>
<revised>July 09, 2012: 1</revised>
<package name="dev-java/jruby" auto="yes" arch="*">
<unaffected range="ge"></unaffected>
<vulnerable range="lt"></vulnerable>
<p>JRuby is a Java-based Ruby interpreter implementation.</p>
<p>JRuby does not properly randomize hash functions to protect against hash
collision attacks.
<impact type="normal">
<p>A remote attacker could send a specially crafted input, possibly
resulting in a Denial of Service condition.
<p>There is no known workaround at this time.</p>
<p>All JRuby users should upgrade to the latest version:</p>
# emerge --sync
# emerge --ask --oneshot --verbose "&gt;=dev-java/jruby-"
<uri link="">CVE-2011-4838</uri>
<metadata timestamp="Mon, 11 Jun 2012 19:25:16 +0000" tag="requester">ackle</metadata>
<metadata timestamp="Mon, 09 Jul 2012 22:35:40 +0000" tag="submitter">ackle</metadata>