DST2K0008.txt

`================================================================================  
Delphis Consulting Plc  
================================================================================  
  
Security Team Advisories  
[30/05/2000]  
  
  
[email protected]  
[http://www.delphisplc.com/thinking/whitepapers/]  
  
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Adv : DST2K0008   
Title : Buffer Overrun in Sambar Server 4.3 (Production)  
Author : DCIST ([email protected])  
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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