Re: Login attacks

[Nathaniel Hall <halln@xxxxxxx>]

I see attempts about every other day.  Because of this, I send e-mails to ISPs about every other day.  After the third offense from within the same range, I block all access to our servers from that range, unless the ISP attempts to correct the problem.

I also keep track of all attempts so that I can reference it later in case of a break in.

Nathaniel Hall, GSEC
Intrusion Detection and Firewall Technician
Ozarks Technical Community College -- Office of Computer Networking

halln@xxxxxxx
417-447-7535

Gerry Doris wrote:

On Tue, 2004-12-07 at 15:24, Michael Yep wrote:
  

Hello

In my LogWatch report I get many login attacks, many from the same IP address.

sshd:
    Authentication Failures:
       root (218.232.109.187): 59 Time(s)
       adm (218.232.109.187): 2 Time(s)
       apache (218.232.109.187): 1 Time(s)
       nobody (218.232.109.187): 1 Time(s)
       operator (218.232.109.187): 1 Time(s)
    Invalid Users:
       Unknown Account: 43 Time(s)

I have permitRootLogin set to NO, and I use strong passwords, but can I 
just add these IP addresses to hosts.deny?
and if so how would I set that up



Michael Yep
Development / Technical Operations
RemoteLink, Inc.
    

I had so many problems with the 218.0.0.0/24 domain that I totally
blocked the entire domain.  I believe this domain is in Korea.