RE: Trace of 139 attack?
From: Stephen Pinto (stephen.pinto@paladion.net)Date: 07/24/01
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From: "Stephen Pinto" <stephen.pinto@paladion.net> To: "Patrik Birgersson" <pbirgersson@telia.com> Subject: RE: Trace of 139 attack? Date: Tue, 24 Jul 2001 03:36:37 +0530 Message-ID: <MJEDLLNPEBEAOCPCANOJAEKICAAA.stephen.pinto@paladion.net>
To add to Patrick
1) administrator account cannot be locked
2) Enable Auditing in your policies
3) Use some software(scheduler) to export your logs to some other machine or
tape after a particular period of time.so that even if the hacker plans of
deleting the logs he cannot do it. Best practice is to use a Dot Matrix
printer to print the logs which is a bit expensive.
Usually if a attacker is doing a brute force on ur Server ur logs will
get full. best solution is to use an IDS (snort which is free)
Try Firewall like checkpoint which has some authentication mechanism.
Better go to www.sans.org you will get lots of info.
Regards
Stephen Pinto
Security Consultant
Paladion Networks,
E-217, Tower-3, International InfoTech Park,
Vashi, Navi Mumbai,400703
Ph: +91 22 7812446 / 7812450/ 7892890
FAX: +91 22 7812140
-----Original Message-----
From: Patrik Birgersson [mailto:pbirgersson@telia.com]
Sent: Wednesday, July 25, 2001 12:34 AM
To: Eagle; focus-ms@securityfocus.com
Subject: SV: Trace of 139 attack?
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You would like to use the Event Log.
There's an HOWTO at:
http://support.microsoft.com/support/kb/articles/Q300/5/49.ASP
(URL might be wrapped).
If this box of yours is a web server to the world, you should _not_
use it as file server with NetBIOS shares 'n stuff. Use another box
on a private network for that
If your shares must be accessed from outside your office (like from
another office or employees on the road) you should use some VPN
solution that tunnels your NetBIOS traffic.
NetBIOS is inheritly insecure and shall _not_ be allowed from
untrusted networks (you know - like the Internet).
If the server you're talking about is an Intranet server, then you
might have a harder time disabling NetBIOS, especially if you got
*old* clients (like Win95/98/ME/NTW) that doesn't utilize Kerberos
for authentication.
However, regardless of the server is "inside" or "outside" and wether
you restricted NetBIOS or net, your Security Log would fill up
quickly if someone's bruteforcing an account. You should configure
your machine so that it'll shut down if the security log fills up
(this can be "dangerous" - you must of course maintain your logs
carefully, otherwise your computer will shutdown "out of the blue" on
day). You should also apply timed account lockouts if more than 5 (3
attempts with manual unlock if you're strict) failed login attempts
has been made.
Patrik Birgersson
# Security is not a product - it is a process #
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