RE: RDP and security

["Dan Harp" <dan () brenius com>]

Not sure how this specifically relates to firewalls...

However, as stated by MS: "every version of RDP uses RSA Security’s RC4
cipher, a stream cipher designed to efficiently encrypt small amounts of
varying size data. RC4 is designed for secure communications over networks,
and is also used in protocols such as SSL, which encrypts traffic to and
from secure Web sites.

In Windows 2000, administrators can choose to encrypt the data using a 56-
or 128-bit key. Encryption is bi-directional except when using the ‘low’
security setting that only encrypts data from the client to the server
(which protects sensitive information such as passwords). The default
setting is “medium” which uses a 56-bit key to bi-directionally encrypt the
data. 128-bit encryption can be enabled after installing the Windows 2000
High Encryption Pack."

As previously stated, the largest flaw is the lack of pre-Windows
authentication. For a more secure system, a non-Windows authentication
should be first, and then once authenticated, access to the Terminal
Services/Remote Desktop authentication process (connected to Windows
authentication) should be granted.

Without writing your own pre-authentication system, or involving a 3rd
party, you could limit connections to TCP port 3389 based on allowed IP
addresses at your firewall.

Regards,


- Dan


> -----Original Message-----
> From: firewall-wizards-admin () honor icsalabs com 
> [mailto:firewall-wizards-admin () honor icsalabs com] On Behalf 
> Of GChen () allianz ca
> Sent: January 6, 2004 9:21 AM
> To: morty () frakir org
> Cc: firewall-wizards () nfr com; 
> firewall-wizards-admin () honor icsalabs com; TSimons () Delphi-Tech com
> Subject: RE: [fw-wiz] RDP and security
>
>
>
>
> Windows 2003 Server may fixed the issue. It supports SSL for 
> Terminal Services over the web.
>
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>                       TSimons () Delphi-Tech com                 
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>                       Sent by:                              
> To:       morty () frakir org                                    
>                           
>                       firewall-wizards-admin@honor.i        
> cc:       firewall-wizards () nfr com                            
>                           
>                       csalabs.com                           
> Subject:  RE: [fw-wiz] RDP and security                       
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>                       01/05/2004 08:24 AM                     
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> In our eyes the biggest design flaw is that there is no 
> authentication prior to the windows authentication.  PCs in a 
> locked office are more secure than a Terminal Server out on 
> the public internet... because you need a key to get into the office.
>
> -----Original Message-----
> From: Mordechai T. Abzug [mailto:morty () frakir org]
> Sent: Friday, November 21, 2003 12:48 AM
> To: firewall-wizards () nfr com
> Subject: [fw-wiz] RDP and security
>
>
>
> Anyone have any strong opinions on the security of RDP 
> (Microsoft's terminal server/remote desktop protocol)?  
> Poking around on the net, I see that they've had at least one 
> design flaw that supposedly hasn't been fixed (ie. server 
> identification.)  Any other design problems?
>
> Thanks!
>
> - Morty
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