================================================================================ Delphis Consulting Plc ================================================================================ Security Team Advisories [30/05/2000] securityteam@delphisplc.com [http://www.delphisplc.com/thinking/whitepapers/] ================================================================================ 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 ================================================================================ I. Description ================================================================================ 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 ================================================================================ 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 ================================================================================ 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. ================================================================================