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<?xml version="1.0" encoding="utf-8"?>
<glsa id="200707-13">
<title>Fail2ban: Denial of Service</title>
Fail2ban is vulnerable to a Denial of Service attack.
<product type="ebuild">fail2ban</product>
<announced>July 28, 2007</announced>
<revised>January 09, 2008: 02</revised>
<package name="net-analyzer/fail2ban" auto="yes" arch="*">
<unaffected range="ge">0.8.0-r1</unaffected>
<vulnerable range="lt">0.8.0-r1</vulnerable>
Fail2ban is a tool for parsing log files and banning IP addresses which
make too many password failures.
A vulnerability has been discovered in Fail2ban when parsing log files.
<impact type="normal">
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.
There is no known workaround at this time.
All Fail2ban users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose &quot;&gt;=net-analyzer/fail2ban-0.8.0-r1&quot;</code>
<uri link="">CVE-2007-4321</uri>
<uri link="">Original advisory</uri>
<metadata tag="requester" timestamp="Tue, 03 Jul 2007 22:02:25 +0000">
<metadata tag="submitter" timestamp="Sun, 15 Jul 2007 18:12:05 +0000">
<metadata tag="bugReady" timestamp="Sun, 15 Jul 2007 18:13:27 +0000">