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<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
<glsa id="200701-01">
<title>DenyHosts: Denial of Service</title>
<synopsis>
DenyHosts does not correctly parse log entries, potentially causing a
remote Denial of Service.
</synopsis>
<product type="ebuild">denyhosts</product>
<announced>January 03, 2007</announced>
<revised>January 03, 2007: 01</revised>
<bug>157163</bug>
<access>remote</access>
<affected>
<package name="app-admin/denyhosts" auto="yes" arch="*">
<unaffected range="ge">2.6</unaffected>
<vulnerable range="lt">2.6</vulnerable>
</package>
</affected>
<background>
<p>
DenyHosts is designed to monitor SSH servers for repeated failed login
attempts.
</p>
</background>
<description>
<p>
Tavis Ormandy of the Gentoo Linux Security Audit Team discovered that
DenyHosts used an incomplete regular expression to parse failed login
attempts.
</p>
</description>
<impact type="normal">
<p>
A remote unauthenticated attacker can add arbitrary hosts to the
blacklist by attempting to login with a specially crafted username. An
attacker may use this to prevent legitimate users from accessing a host
remotely.
</p>
</impact>
<workaround>
<p>
There is no known workaround at this time.
</p>
</workaround>
<resolution>
<p>
All DenyHosts users should upgrade to the latest version:
</p>
<code>
# emerge --sync
# emerge --ask --oneshot --verbose ">=app-admin/denyhosts-2.6"</code>
</resolution>
<references>
<uri link="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-6301">CVE-2006-6301</uri>
</references>
<metadata tag="submitter" timestamp="Mon, 18 Dec 2006 22:34:37 +0000">
taviso
</metadata>
<metadata tag="bugReady" timestamp="Mon, 01 Jan 2007 14:18:29 +0000">
taviso
</metadata>
</glsa>
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