Re: Home firewall Hits

[<rjemckay () verizon net>]

Tony - check the log tab in your Linksys router setup, it probably has logging enabled.  If it is it will send 
oout/broadcast SNMP packets with log information obtained at the router.  I'm assuming that you're runing your router 
as a NAT box and so much if not all of the inbound traffic from the internet is being blocked at the router (unless 
you've enable various services).  If you want to check or view the log information from the router I would suggest 
using WallWatcher and WallreViewer - both packages are free.  WallWatcher will show give you a nice readout of the SNMP 
logs generated by your router, WallReViewer gives you a nice analysis of the logs over a period of time.  Also, you 
will need to determine what internal IP address you want the router to broadcast to - if you want it to broadcast to 
all computers on your internal network use 255 in the last octet or put a specific computer IP address.  

Wall Watcher and WallReViewer can be found at 
http://www.sonic.net/~sraaii/wallwatcher/Index.html

rm
> From: "Preston, Tony" <Tony.Preston () acs-inc com>
> Date: 2003/10/31 Fri AM 08:56:15 EST
> To: "'security-basics () securityfocus com'" <security-basics () securityfocus com>
> Subject: Home firewall Hits
>
> I am hoping someone here can explain what I am seeing on my home network.
> I use Kerio's tiny personal firewall and Windows ME.  I have everything up
> to date with the latest patches.
>
> This is my home network and something strange is happening.  The
> configurations is
>
>
>   [cable modem] <----> [ Linksys Wireless Router] ~~~ [ Windows ME W/
> firewall ]
>
>
> From reading the firewall log, I would think that my router is continuously
> hitting 
> Port 162  with a UDP message.  The odd thing is that it is doing this by
> using an 
> incrementing port from  192.168.1.1, I see many of these every day, it is
> continuous.
>
> I have the latest firmware from linksys, the firewall is rejecting all the
> packets.
>
> While I am an experienced programmer, I do not have alot of network
> experience, probably
> I would classify myself as knowing enough to be dangerous...:) 
>
> The activity is at a moderate rate from a couple per second to one every 20
> seconds.  If it
> is some sort of attack attempt it is using a randomized delay between
> packets.
>
> Here is a summary of the hits.
>
> [30/Oct/2003 23:53:48] Rule 'Packet to unopened port received': Blocked: In
> UDP, 
>   192.168.1.1:40826->localhost:162, Owner: no owner
>       thru
>   192.168.1.1:40899->localhost:162, Owner: no owner
>
>
> I do see other "hits" which are much less frequent which are an occasional
> hit here or
> there, I am not as concerned about these, but would be curious if anyone has
> ideas about
> why they occur.   The first one, I might see one or two a day.   The second
> one would
> show up in sets of 5-10, maybe a couple of times a day.
>
> [30/Oct/2003 23:53:56] Rule 'TCP ack packet attack': Blocked: In TCP,
>  207.46.197.121:80->localhost:1452, Owner: no owner
>
> [31/Oct/2003 00:00:02] Rule 'Packet to unopened port received': Blocked: In
> UDP,
>  0.0.0.0:68->localhost:67, Owner: no owner
>
> Anything here I should be concerned with??
>
> I am hoping someone here can explain what I am seeing on my home network.
> I use Kerio's tiny personal firewall and Windows ME.  I have everything up
> to date with the latest patches.
>
> The configurations is:
>
>   [cable modem] <----> [ Linksys Wireless Router] ~~~ [ Windows ME W/
> firewall ]
>
>
> From reading the firewall log, I would think that my router is continuously
> hitting 
> Port 162  with a UDP message.  The odd thing is that it is doing this by
> using an 
> incrementing port from  192.168.1.1, I see many of these every day, it is
> continuous.
>
> I have the latest firmware from linksys, the firewall is rejecting all the
> packets.
>
> While I am an experienced programmer, I do not have alot of network
> experience, probably
> I would classify myself as knowing enough to be dangerous...:) 
>
> The activity is at a moderate rate from a couple per second to one every 20
> seconds.  If it
> is some sort of attack attempt it is using a randomized delay between
> packets.
>
> Here is a summary of the hits.
>
> [30/Oct/2003 23:53:48] Rule 'Packet to unopened port received': Blocked: In
> UDP, 
>   192.168.1.1:40826->localhost:162, Owner: no owner
>       thru
>   192.168.1.1:40899->localhost:162, Owner: no owner
>
>
> I do see other "hits" which are much less frequent which are an occasional
> hit here or
> there, I am not as concerned about these, but would be curious if anyone has
> ideas about
> why they occur.   The first one, I might see one or two a day.   The second
> one would
> show up in sets of 5-10, maybe a couple of times a day.
>
> [30/Oct/2003 23:53:56] Rule 'TCP ack packet attack': Blocked: In TCP,
>  207.46.197.121:80->localhost:1452, Owner: no owner
>
> [31/Oct/2003 00:00:02] Rule 'Packet to unopened port received': Blocked: In
> UDP,
>  0.0.0.0:68->localhost:67, Owner: no owner
>
> Anything here I should be concerned with??
>
>
>
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Forum Systems PRESIDIO: PGP / XML GATEWAY APPLIANCE
The Presidio integrates PGP data encryption and XML Web Services security to 
simplify the management and deployment of PGP and reduce overall PGP costs 
by up to 80%.
FREE WHITEPAPER & 30 Day Trial - 
http://www.securityfocus.com/sponsor/ForumSystems_security-basics_031027 
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