Unverified security issue and workaround

tz1

I haven't been able to exploit a potential problem with the KR1 (even the new firmware), but I've found a way to block it in any case. I won't go into details about what is going on - anyone smart enough can figure out what the problem might be.

If the problem is real (it is hard to exploit from behind a firewall), then it is extremely serious. Also note my GPSD firmware releases aren't designed to be secure though I'm working on fixes for that too, but for my firmware you can also block TCP 23/23 in addition to UDP 69/69 below to prevent remote logins to the KR1.

I would recommend everyone with a KR1 add the following configuration setting

Go to the advanced, virtual server page:

http://192.168.0.1/adv_virtual.html <use your KR1 address

name: security1 <anything to identify it
PrivateIP: 10.9.8.7 <something that doesn't exist
Protocol Type: UDP
Private port:69 <could be anything
Public port:69
Schedule: always

After applying, you should see a new line at the bottom of the list like:

security1 10.9.8.7 UDP 69/69 always

mysigp226 · EVDO User Joined: 26 Nov 2005 Posts: 42

don't tell me they are allowing tftp on the wan port!

tz1 · Posted: Thu Mar 23, 2006 11:55 am Post subject:

Ok, I won't tell you. But so far I haven't gotten it to work completely because the UDP packets haven't worked their way back from the EVDO card, however the transaction starts because a file with the correct name is created on the router if you do tftp put. This might be serious for reasons I won't go into, but it could be very, very serious if a whole file could be downloaded correctly.

But just because my connections so far have not done the right things with UDP packets, it doesn't mean others won't, or consider one EVDO box to another using the same provider, so it doesn't go through very many routers.

Mackieman · EVDO Junkie Joined: 31 Oct 2005 Posts: 491

There is really no way to know what IP is using what unless you're capturing packets from the EVDO RF stream. I believe the likelihood of this ever being an issue is very, very remote.

tz1 · Posted: Fri Mar 24, 2006 7:19 pm Post subject:

Unless you use Dyndns type services which might specifically identify you (like my kr1gps.dyndns.org).