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Posted
We use something called Netviewer. Never seems to have any problems getting onto RM clients although it does require someone on the other side to initiate the client bit of software every time.
Posted
i found it was blocked today but you can go into your rm admin webpage and allow it. i put *.logmein.com* and this allowed me to access both http://www.logmein.com and secure.logmein.com and all other pages after that. i don't really understand why they would want to ban it either. i love checking on my downloads from work
Posted
I've been experimenting with DNS tunnels.

 

::cough::splutter:: DNS as covert channel is an idea you're supposed to scare folk with (someone did that to many years ago), but no one was supposed to write it!!

 

Does this one do the tricky to stop stuff? IOW you give it a DNS domain/zone e.g. example.com, the NS for that zone is the tunnel endpoint and it all works via some nearby DNS box and whatever forwarders that might be using?

 

RM use logmein themselves

 

AIUI RM paid some money and don't have you bouncing via logmein servers. Logmein is also blocked by my local LEA and it's perfectly obvious why.

Posted
Does this one do the tricky to stop stuff? IOW you give it a DNS domain/zone e.g. example.com, the NS for that zone is the tunnel endpoint and it all works via some nearby DNS box and whatever forwarders that might be using?

 

You need a box somewhere out on the internet running the 'server' end of the software. This box needs to be pointed to as being a DNS server authoritative for some domain. This is easily done with dyndns.org for example.

 

On the client end you need the client software and tell it what domain it should tunnel to. It'll use the local DNS servers and they will merrily relay the DNS zone info (and thus the data) and be none the wiser.

 

Basically you end up with a functioning TCP connection between your client system and your remote server using the existing DNS infrastructure. You can then widen this up with SSH and do some port mapping to get what ever application running you want.

 

World of Warcraft works quite well.

 

The only effective countermeasures I've seen implemented is to limit the number of dns queries/sec a client can make (not possible with Windows DNS AFAIK) and thus the speed of the tunnel or using IDS signatures to detect the tunnel (running SSH through the DNS tunnel mitigates this)

Posted
It'll use the local DNS servers and they will merrily relay the DNS zone info

 

Oh good :(

 

Soooo... assuming you can get away with it, disable recursion/forwarding on internal DNS.

Posted
Yes, or use a real DNS server that allows you to control the queries/sec. You can easily delegate your AD specific sub zones back down to your Windows DNS servers (or just import the records from a DC).
  • 3 years later...

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