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                                 Delphis Consulting Plc
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                               Security Team Advisories
                                    [30/05/2000]
                                        
      
                             securityteam@delphisplc.com
                  [http://www.delphisplc.com/thinking/whitepapers/]
        
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Adv     :       DST2K0008 
Title   :       Buffer Overrun in Sambar Server 4.3 (Production)
Author  :       DCIST (securityteam@delphisplc.com)
O/S     :       Microsoft Windows NT v4.0 Workstation (SP6)
Product :       Sambar Server 4.3 Beta 9 (Production)
Date    :       30/05/2000

I.    Description

II.   Solution

III.  Disclaimer


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I. Description
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Delphis Consulting Internet Security Team (DCIST) discovered the following
vulnerability in the Sambar Server under Windows NT.

By using the default finger script shipped with Sambar server it is possible
to cause an Buffer overrun in sambar.dll overwriting the EIP allowing the 
execution of arbitry code. This is done by sending a large hostname in the 
required field. The string has to be a length of 32286 + EIP (4 bytes) making
a total of 32290 bytes.

From the our research it seems the problem also exists in a number of scripts
which rely on sambar dll functionality this includes but is not limited to:

o whois demonstration script
o finger demonstration script



II. Solution
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Vendor Status: Informed

Currently there is no vendor patch available but the following are preventative
measures Delphis Consulting Internet Security Team would advise users running
this service to implement.

o Remove both demonstration scripts.



III. Disclaimer
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THE INFORMATION CONTAINED IN THIS ADVISORY IS BELIEVED TO BE ACCURATE AT
THE TIME OF PRINTING, BUT NO REPRESENTATION OR WARRANTY IS GIVEN, EXPRESS OR
IMPLIED, AS TO ITS ACCURACY OR COMPLETENESS.  NEITHER THE AUTHOR NOR THE
PUBLISHER ACCEPTS ANY LIABILITY WHATSOEVER FOR ANY DIRECT, INDIRECT OR
CONSEQUENTIAL LOSS OR DAMAGE ARISING IN ANY WAY FROM ANY USE OF, OR RELIANCE
PLACED ON, THIS INFORMATION FOR ANY PURPOSE.
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