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Thread: Dovecot Brut force
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09-21-2013, 01:28 AM #1I Like Beer!
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Dovecot Brut force
hello these logs are send by logwatch to me
how can i fix the problem
its near 12000 line
dovecot[2895]: auth-worker(16753): shadow(access,91.183.99.84): unknown user: 32 Time(s)
dovecot[2895]: auth-worker(16753): shadow(account,91.183.99.84): unknown user: 32 Time(s)
dovecot[2895]: auth-worker(16753): shadow(admin,91.183.99.84): Password mismatch: 32 Time(s)
dovecot[2895]: auth-worker(16753): shadow(administrador,91.183.99.84): unknown user: 9 Time(s)
dovecot[2895]: auth-worker(16753): shadow(administrator,91.183.99.84): unknown user: 22 Time(s)
dovecot[2895]: auth-worker(16753): shadow(alfredo,91.183.99.84): unknown user: 10 Time(s)
dovecot[2895]: auth-worker(16753): shadow(angel,91.183.99.84): unknown user: 9 Time(s)
dovecot[2895]: auth-worker(16753): shadow(antonio,91.183.99.84): unknown user: 10 Time(s)
dovecot[2895]: auth-worker(16753): shadow(backup,91.183.99.84): unknown user: 31 Time(s)
dovecot[2895]: auth-worker(16753): shadow(bill,91.183.99.84): unknown user: 9 Time(s)
dovecot[2895]: auth-worker(16753): shadow(carmelo,91.183.99.84): unknown user: 9 Time(s)
dovecot[2895]: auth-worker(16753): shadow(clark,91.183.99.84): unknown user: 10 Time(s)
dovecot[2895]: auth-worker(16753): shadow(client,91.183.99.84): unknown user: 10 Time(s)
dovecot[2895]: auth-worker(16753): shadow(club,91.183.99.84): unknown user: 8 Time(s)
dovecot[2895]: auth-worker(16753): shadow(company,91.183.99.84): unknown user: 9 Time(s)
dovecot[2895]: auth-worker(16753): shadow(contact,91.183.99.84): unknown user: 10 Time(s)
dovecot[2895]: auth-worker(16753): shadow(contas,91.183.99.84): unknown user: 10 Time(s)
dovecot[2895]: auth-worker(16753): shadow(cs,91.183.99.84): unknown user: 10 Time(s)
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09-21-2013, 01:37 AM #2Newbie
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You want one of these:
http://www.rfxn.com/projects/brute-force-detection/
http://www.fail2ban.org/
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09-22-2013, 02:36 AM #3I Like Beer!
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BFD:
it has scan all log every 3 min to check brute force and detect some ips,
what will bfd do after detect ips?
add them to iptables and ban them from server service access ?
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09-22-2013, 05:52 PM #4Newbie
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09-22-2013, 02:50 AM #5The Linux Specialist
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You can also try CSF: http://configserver.com/cp/csf.html
Works well for us.
Specially 4 U
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09-22-2013, 09:29 AM #6I Like Beer!
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which csf option check dovecot for Brut force ?
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09-22-2013, 09:57 AM #7Junior Guru Wannabe
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09-22-2013, 10:38 AM #8Newbie
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Do you have cpanel installed? If you do I would recommend installing csf (as well as lfd) and configure its fail-attempt ip blacklisting.
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09-23-2013, 02:24 AM #9Web Hosting Master
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Install CSF firewall as suggested and configure login failure for email, FTP, SSH etc. This should prevent brute force login from the same IP address.
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09-24-2013, 07:23 AM #10Temporarily Suspended
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dovecot bruteforce
I would recommend installing csf (as well as lfd) and configure its fail-attempt ip blacklisting.
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