<?xml version="1.0" encoding="utf-8"?> <!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd"> <glsa id="200702-05"> <title>Fail2ban: Denial of service</title> <synopsis> A flaw in Fail2ban may allow remote attackers to deny access to arbitrary hosts. </synopsis> <product type="ebuild">fail2ban</product> <announced>2007-02-16</announced> <revised count="01">2007-02-16</revised> <bug>157166</bug> <access>remote</access> <affected> <package name="net-analyzer/fail2ban" auto="yes" arch="*"> <unaffected range="ge">0.6.2</unaffected> <vulnerable range="lt">0.6.2</vulnerable> </package> </affected> <background> <p> Fail2ban monitors log files for failed authentication attempts and can block hosts responsible for repeated attacks. </p> </background> <description> <p> A flaw in the method used to parse log entries allows remote, unauthenticated attackers to forge authentication attempts from other hosts. </p> </description> <impact type="normal"> <p> A remote attacker can add arbitrary hosts to the block list, denying legitimate users access to a resource. </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 ">=net-analyzer/fail2ban-0.6.2"</code> </resolution> <references> <uri link="https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-6302">CVE-2006-6302</uri> </references> <metadata tag="requester" timestamp="2007-02-12T22:35:11Z"> falco </metadata> <metadata tag="bugReady" timestamp="2007-02-12T22:42:08Z"> falco </metadata> <metadata tag="submitter" timestamp="2007-02-12T22:56:35Z"> taviso </metadata> </glsa>