RE: Odd entries in my Security Router logs

From: Andrews, Jonathan (US - Hermitage) <joandrews(at)deloitte.com>
Date: Tue Dec 10 2002 - 12:17:54 EST

192.168.0.0/16 is a privately addressed netblock. These packets could not be routed over the Internet. Do you NAT at your edge router and were these traces obtained from the "internal" interface of your router?

If so, this would have to be something on your internal network broadcasting this traffic.

Jonathan Andrews, CISSP CCSA
Sr. Information Security Analyst
Network Security Group
Deloitte & Touche

-----Original Message-----
From: Julian Young [mailto:julian.young@nl.compuware.com] Sent: Monday, December 09, 2002 3:38 AM
To: incidents@securityfocus.com
Subject: Odd entries in my Security Router logs

I keep seeing these entry in my external routers log files. Does any one recognize theme and know what type of attack they are. ok is obviously something to do with DHCP. but i recently had a firewall compromised and i still don't know how. since that wall had dhcp open I wounder if this could have been the trick.

I has left the ip number as they are since none of them belong to me or in any range i use !

#   Time        Packet Information                             
Reason            Action
  1|Dec  8 02 |From:192.168.7.249   To:192.168.255.254 |match          


|block  


   | 09:37:12 |UDP     src port:00068 dest port:00067  |service deny   

|      

  2|Dec  8 02 |From:192.168.8.250   To:192.168.255.254 |match          


|block  


   | 09:37:12 |UDP     src port:00068 dest port:00067  |service deny   

|      

  3|Dec  8 02 |From:192.168.7.249   To:192.168.255.254 |match          


|block  


   | 15:45:32 |UDP     src port:00068 dest port:00067  |service deny   

|      





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This list is provided by the SecurityFocus ARIS analyzer service. For more information on this free incident handling, management and tracking system please see: http://aris.securityfocus.com Received on Wed Dec 11 13:13:55 2002