ssh attempts



I´ve noticed that several Linux Machines I have running are getting scanned via ssh for
multiple accounts such as "guest webmaster mysql info shell apache test..." and many others,
the log show:


Jan 3 01:31:08 machine sshd2[22087]: WARNING: DNS lookup failed for "X.X.X.233".
Jan 3 01:31:10 machine sshd2[22087]: password authentication failed. Login to account webmaster not allowed or account non-existent.
Jan 3 01:31:13 machine sshd2[21757]: LoginGraceTime exceeded.


as well there are attempts to connect with root login, with the log message show as:

WARNING: DNS lookup failed for "X.X.X.233".
Jan  3 01:17:53 machine sshd2[21651]: root login denied for user 'root'.

Obviously, We don´t have accounts with that name on our systems, and the root account
is disabled for ssh, but I would like to know which software can do this scan type, because
while it's running, the machine proccesses grow too much.


Thanks.
Emilio C.


---------------------------------------------------------------------------
EARN A MASTER OF SCIENCE IN INFORMATION ASSURANCE - ONLINE
The Norwich University program offers unparalleled Infosec management education and the case study affords you unmatched consulting experience. Tailor your education to your own professional goals with degree customizations including Emergency Management, Business Continuity Planning, Computer Emergency Response Teams, and Digital Investigations.


http://www.msia.norwich.edu/secfocus
----------------------------------------------------------------------------



Relevant Pages

  • Re: ssh attempts
    ... IF they are able to hit your system like that via SSH it is ... > Login to account webmaster not allowed or account non-existent. ... > education and the case study affords you unmatched consulting experience. ... > Computer Emergency Response Teams, ...
    (Security-Basics)
  • Re: ssh attempts
    ... the excellent iptables firewall you probably already have on your system. ... consider changing the port SSH listens on. ... Login to account webmaster not allowed or account non-existent. ... Computer Emergency Response Teams, and Digital Investigations. ...
    (Security-Basics)
  • Re: ssh attempts
    ... Limiting SSH to a particular IP isn't always practical. ... the excellent iptables firewall you probably already have on your system. ... >> Login to account webmaster not allowed or account non-existent. ... >> Computer Emergency Response Teams, ...
    (Security-Basics)
  • Re: Passing password in ssh
    ... If I create keys without a passphrase, and share the public keys between ... You do know that you first have to get the private key of the key ... The .ssh directory also ... But simply cracking into a user's account who has access to several ...
    (Fedora)
  • Re: Problems with Sudo
    ... where only one unprivileged account is allowed to log in. ... you're gaining nothing at all by running two ssh daemons ... Using odd port numbers isn't very useful either, ... I have SSH exposed to the world with key-only login and an iptables ...
    (Ubuntu)