[NT] Savant Webserver Buffer Overflow Vulnerability

From: support@securiteam.com
Date: 01/14/02 

From: support@securiteam.com
To: list@securiteam.com
Date: Mon, 14 Jan 2002 23:07:32 +0100 (CET)

The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com
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  Savant Webserver Buffer Overflow Vulnerability
------------------------------------------------------------------------

SUMMARY

 <http://sourceforge.net/projects/savant/> Savant web server is a very
configurable freeware HTTP daemon for Windows 95, 98, NT and 2000. A
vulnerability in the product allows attackers to cause an internal buffer
overflow, allowing them to execute arbitrary code.

DETAILS

Vulnerable systems:
Savant version 3.0

Example:
Server crashes after sending very long parameter a few times.

http://host/cgi-bin/cgi-test.pl.............................................................................................................
................................................................................................................................

The instruction at "0x002e2e3d" referenced memory at "0xac40303c".
The memory could not be "written".

Log:
Error File: <error.txt>
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Error: TCP buffer overflow
Error: TCP buffer overflow
Error: TCP buffer overflow
Error: TCP buffer overflow
Error: TCP buffer overflow
Error: TCP buffer overflow
Error: TCP buffer overflow
Error: TCP buffer overflow
Error: TCP buffer overflow
Error: TCP buffer overflow
Error: TCP buffer overflow
Error: TCP buffer overflow
Error: TCP buffer overflow
Error: Failure to create CGI Process
Error: Failure to create CGI Process
Error: Failure to create CGI Process
Error: Failure to create CGI Process
Error: Failure to create CGI Process
Error: Failure to create CGI Process
Error: Failure to create CGI Process
Error: Failure to create CGI Process
Error: Failure to create CGI Process

ADDITIONAL INFORMATION

The information has been provided by <mailto:ts@securityoffice.net> Tamer
Sahin.

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