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<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
<glsa id="200707-13">
<title>Fail2ban: Denial of Service</title>
<synopsis>
Fail2ban is vulnerable to a Denial of Service attack.
</synopsis>
<product type="ebuild">fail2ban</product>
<announced>July 28, 2007</announced>
<revised>January 09, 2008: 02</revised>
<bug>181214</bug>
<access>remote</access>
<affected>
<package name="net-analyzer/fail2ban" auto="yes" arch="*">
<unaffected range="ge">0.8.0-r1</unaffected>
<vulnerable range="lt">0.8.0-r1</vulnerable>
</package>
</affected>
<background>
<p>
Fail2ban is a tool for parsing log files and banning IP addresses which
make too many password failures.
</p>
</background>
<description>
<p>
A vulnerability has been discovered in Fail2ban when parsing log files.
</p>
</description>
<impact type="normal">
<p>
A remote attacker could send specially crafted SSH login banners to the
vulnerable host, which would prevent any ssh connection to the host and
result in a Denial of Service.
</p>
</impact>
<workaround>
<p>
There is no known workaround at this time.
</p>
</workaround>
<resolution>
<p>
All Fail2ban users should upgrade to the latest version:
</p>
<code>
# emerge --sync
# emerge --ask --oneshot --verbose &quot;&gt;=net-analyzer/fail2ban-0.8.0-r1&quot;</code>
</resolution>
<references>
<uri link="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-4321">CVE-2007-4321</uri>
<uri link="http://www.ossec.net/en/attacking-loganalysis.html#fail2ban">Original advisory</uri>
</references>
<metadata tag="requester" timestamp="Tue, 03 Jul 2007 22:02:25 +0000">
aetius
</metadata>
<metadata tag="submitter" timestamp="Sun, 15 Jul 2007 18:12:05 +0000">
p-y
</metadata>
<metadata tag="bugReady" timestamp="Sun, 15 Jul 2007 18:13:27 +0000">
p-y
</metadata>
</glsa>