CVE-2007-4321 Information

Description

fail2ban 0.8 and earlier does not properly parse sshd log files which allows remote attackers to add arbitrary hosts to the /etc/hosts.deny file and cause a denial of service by adding arbitrary IP addresses to the sshd log file as demonstrated by logging in via ssh with a client protocol version identification containing an IP address string a different vector than CVE-2006-6302.

Reference

http://bugs.gentoo.org/show_bug.cgi?id=181214 http://osvdb.org/42484 http://secunia.com/advisories/23237 http://secunia.com/advisories/28374 http://security.gentoo.org/glsa/glsa-200707-13.xml http://www.debian.org/security/2008/dsa-1456 http://www.ossec.net/en/attacking-loganalysis.html http://www.securityfocus.com/bid/25117