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Brute force attack

Discussion in 'Security' started by hifi_ninja, Apr 7, 2008.

  1. hifi_ninja

    hifi_ninja Member

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    Hi,
    Im a bit nervous about a brute force attack occurring right now on my server...
    (obs. sorry for my broken english)

    I received a lot of emails saying:
    login failures attempts to account

    I checked the cPHulk and found the IP and blocked it using APF firewall
    I set the cPHulk with the following:

    Configure Settings
    IP Based Brute Force Protection Period in minutes: 30
    Brute Force Protection Period in minutes: 35
    Maximum Failures By Account: 15
    Maximum Failures Per IP: 8
    Maximum Failures Per IP before IP is blocked for two week period: 20
    Extend account lockout time upon additional authentication failures: Y
    Send notification when brute force user is detected: Y

    But, what's frightening me :eek: is that the brute force is trying the exact user names os my clients... How could it know that? Did I got cracked in a way the cracker could know only the real usernames but not the passwords? :confused:

    Thanks! :eek:
    Henrique.
     
    #1 hifi_ninja, Apr 7, 2008
  2. nyjimbo

    nyjimbo Well-Known Member

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    Its possible someone who has shell access got hold of the password file, without the actual passwords and is trying to hack that. Years ago we had a customer on a box we that offered shell access on and he went and grabbed the /etc/passwd file, weeks later came back and started to try to hack them with a script. Not sure what he was trying to do but he was doing it. Also its possible a spammer attacked your machine with emails to the servers domain name and found results of real account names (no undeliverable returns) and is trying to hack that.
     
    #2 nyjimbo, Apr 7, 2008
  3. Kent Brockman

    Kent Brockman Well-Known Member

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    Twitter:
    Does the usernames of your accounts differ from the domain name their belongs to? i.e: domain: onedomain.com ; username: onedomai

    That also gives a bit of help for crackers and should be aware of.

    Like Jimbo says, I also seen logged (using Logwatch) login attempts using usernames of email accounts currently being spammed. for such brute force attacks, we are lowering their incidence using the (D)DoS-Deflate script (http://deflate.medialayer.com/) ;)
     
    #3 Kent Brockman, Apr 9, 2008
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