Security Basics mailing list archives
Re: I need help with Firewall Hits
From: ~Kevin Davis³ <kevin.davis () mindless com>
Date: Mon, 3 Nov 2003 19:43:25 -0500
Linksys routers transmit their router logs via port 162. Go into your admin (web) interface and turn off your logging. Or, get some software to help process the logs (for one example www.wallwatcher.com) ~Kevin Davis³ What possibly could go wrong? ----- Original Message ----- From: "Preston, Tony" <Tony.Preston () acs-inc com> To: <security-basics () securityfocus com> Sent: Monday, November 03, 2003 11:08 AM Subject: I need help with Firewall Hits
I thought I posted this information the other day(with a different set of data), but did not see it so I am re-asking my questions... I have a Win/Me with the latest patches, a linksys wireless router with
the
latest firmware (BEFS4W11 V 1.44). My Wireless card has the latest
drivers.
I have Kerio tiny personal firewall (latest version) installed and it is collecting about 700 hits per day of the same type. I am no expert on
this
kind of thing so any help is appreciated. My system looks like: ~~~~[Cable modem]~~~~~[Linksys Wireless Router] ... [ Win/ME, TPF ] I have changed the ssid and channel (althought the channel is apparently
not
used) from the default, WEP is not enabled. There are three systems that could be on my wireless network (my system and two laptops, the hits occur even when the laptops are not connected so I have assumed they are not the cause). I only see the MAC addresses of the three systems in my router tables. The hits are a continuous attempt to hit port 162 on my system, the
"sender"
is always ip address 192.168.1.1, my router's ip address, with a port that varies on each hit, increments on each hit. Over the last few days it was 40901 to 42925 (almost 2000 hits over the last 3 days) A summary of the report is: 1,[31/Oct/2003 07:12:30] Rule 'Packet to unopened port received': Blocked: In UDP, 192.168.1.1:40901->localhost:162, Owner: no owner ... 192.168.1.1:42925->localhost:162, Owner: no owner I do get other hits, but those are few enough, blocked, and I can identify the exploits (msblaster trying to infect my system for example) so they
are
of a lesser concern that this one. I would like to resolve who/why I am getting these hits and identify what the exploit is. How can I figure out where these are coming from? I have reset the router (to ensure it wasn't the router that was doing
them)
and cable modem. Anyone have any ideas on what I can do to track this down and possibly
stop
it? Tony Preston Systems Engineer, AS&T Inc. Division of L3 Corporation (609) 485-0205 x 181 -----Original Message----- From: Ivan Hernandez [mailto:ivan.hernandez () globalsis com ar] Sent: Wednesday, October 29, 2003 2:21 PM To: Ansgar -59cobalt- Wiechers Cc: security-basics () securityfocus com Subject: Re: Personal Firewall for Business use Ansgar -59cobalt- Wiechers wrote:On 2003-10-27 Ivan Hernandez wrote: [ Windows TCP filtering ] "Application level protection" is ridiculous if the protecting agent is running on the same box. I keep wondering how people can expect software that allows user interaction (like most personal firewalls do) to prevent other (malicious) software from doint whatever it pleases. Regards Ansgar WiechersI would reccomend you to read the good information about on the Gibson Research site at http://www.grc.com Try the information leak utility that's very usefull with all the other toys written in assembly. It's a nice and educational site. Windows Kernel Filtering will not stop a trojan from making connections on the internet, and that's one of the most important risks on a personal computer. Most worms are going via email today, and the filter will do nothing with that, but with some application level filtering, like Zone Alarm has, you can catch them before they go to the internet. Windows Kernel Filter also is very bad option to filter UDP traffic. For example... you would, just want to recieve responses of DNS queryies you have made, but this is just impossible because you have no way to keep track of your connections. I think you must take a little more time before saying that somthing that other said is "ridiculous" and, in doubt ask first what did the other exactly mean, and ask for more information if necessary. Cheers... Ivan Hernandez http://biromeponja.8k.com --------------------------------------------------------------------------
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Current thread:
- I need help with Firewall Hits Preston, Tony (Nov 03)
- RE: I need help with Firewall Hits jm (Nov 03)
- RE: I need help with Firewall Hits David Gillett (Nov 03)
- Re: I need help with Firewall Hits ~Kevin Davis³ (Nov 04)
- <Possible follow-ups>
- RE: I need help with Firewall Hits Thomson, Stuart A. (Nov 03)
- Re: I need help with Firewall Hits bp1974 (Nov 03)