CVE-2006-6301

DenyHosts 2.5 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 login name containing certain
strings with an IP address, which is not properly handled by a regular
expression.

Bugs

• <https://bugs.launchpad.net/ubuntu/+source/denyhosts/+bug/163257&gt;