Synopsis :

It may be possible to get access to the remote host.

Description :

The remote version of the Remote Desktop Protocol Server (Terminal
Service) is vulnerable to a man-in-the-middle (MiTM) attack. The RDP client
makes no effort to validate the identity of the server when setting
up encryption. An attacker with the ability to intercept traffic
from the RDP server can establish encryption with the client and server
without being detected. A MiTM attack of this nature would allow the
attacker to obtain any sensitive information transmitted, including
authentication credentials.

This flaw exists because the RDP server stores a hardcoded RSA
private key in the mstlsapi.dll library. Any local user with
access to this file (on any Windows system) can retrieve the
key and use it for this attack.

See also :

http://www.oxid.it/downloads/rdp-gbu.pdf
http://www.nessus.org/u?e2628096
http://technet.microsoft.com/en-us/library/cc782610.aspx

Solution :

- Force the use of SSL as a transport layer for this service if supported, or/and
- Select the 'Allow connections only from computers running Remote Desktop with
Network Level Authentication' setting if it is available.

Risk factor :

Medium / CVSS Base Score : 5.1
(CVSS2#AV:N/AC:H/Au:N/C:P/I:P/A:P)
CVSS Temporal Score : 4.6
(CVSS2#E:F/RL:W/RC:ND)
Public Exploit Available : true