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DDIVRT-2007-05 NetSupport Manager Client Buffer Overflow

NetSupport Manager Client Buffer Overflow


Date Discovered

Discovered By
Digital Defense, Inc. Vulnerability Research Team Credit Given To: sxkeebler and r@b13$ http://www.digitaldefense.net/

Vulnerability Description
The NetSupport Manager client that listens on TCP port 5405 does not properly validate input supplied during the initial connection sequence. 
Specifically, during the configuration exchange part of the initial connection setup, the client does not appear to validate the supplied data which can result in a DoS of the NetSupport Manager Client.  Remote code exploitation is also thought to be possible.  Within Technical Document ID TD545, NetSupport acknowledges that this flaw is present in unspecified versions of NetSupport School Student.

Solution Description
Digital Defense, Inc. notified NetSupport on September 9, 2007 of this flaw but did not receive any response or acknowledgement from the vendor. 
However, NetSupport has released a patch for this flaw as described by NetSupport Technical Document ID TD545.  

Tested Systems / Software (with versions)
NetSupport Manager 10.20 running on Windows XP SP2 and Windows 2K3 SP2.  

NetSupport acknowledges in Technical Document ID TD545 that the following versions of the NetSupport Manager are vulnerable to this flaw:

NSM 10.00, NSS 9.00, NSM 10.20

Vendor Contact