Re: [SR-Users] dictionary attacks

Juha, I think we should be specially careful about black-lists. We receive many of these attacks in a per-day basis and a lot of them are from residential addresses or university, so I'm guessing some kind of worm or trojan performing the attack from various IPs. If you have the time, try fail2ban deamon. It can relate some brute-force events and act accordingly blocking an IP on iptables, executing a script. You send to "jail" those addresses for a period of time, then you can get them out again; and of course you can manually revert. Last, as a description of the attacks I saw, first it runs an NMAP like scan checking which IPs answer from 5060, then it starts sending registers (usually asterisk answers 404 if the user does not exist), then when the proxy challenges, it interprets the user is found and starts making dictionary attacks on the password (1234, admin, and so on). Keep safe complicated passwords, make kamailio challenge everything and you'll be safe. and again, fail2ban is a pretty good solution for brute force. This might help you finding a solution for your attacks. Cheers, Uriel On Sun, Oct 24, 2010 at 8:54 AM, Juha Heinanen <jh(a)tutpro.com> wrote: