A vulnerability has been reported in Fail2ban, which can be exploited by malicious people to cause a DoS (Denial of Service).
The vulnerability is caused due to an incorrect regular expression included in the filter.d/wuftpd.conf file. This can be exploited to ban legitimate users by making multiple invalid authentication requests from a specially crafted hostname.
Solution: Remove the affected wuftpd.conf file.
Provided and/or discovered by: Reported by Chris Butler in a Debian bug report.
Original Advisory: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=514163
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Subject: Fail2ban "wuftpd.conf" Denial of Service Vulnerability
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