Savant Webserver Buffer Overflow Vulnerability

["Tamer Sahin" <ts () securityoffice net>]

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Savant Webserver Buffer Overflow Vulnerability

Type:
DoS, crashes Daemon

Release Date:
January 5, 2002

Product / Vendor:
Savant is a freeware open source web server that runs on Windows 95,
98, ME, NT, and 2000, turning any desktop computer into a powerful
web server.  Designed to be fast, secure, and efficient, Savant is
the choice of thousands of professional and amateur webmasters
worldwide.

http://savant.sourceforge.net

Summary:
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>
- -
- -
- -
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

Tested:
Windows 2000 / Savant 3.0

Vulnerable:
Savant 3.0 (And may be other)

Disclaimer:
http://www.securityoffice.net is not responsible for the misuse or
illegal use of any of the information and/or the software listed on
this security advisory.

Author:
Tamer Sahin
ts () securityoffice net
http://www.securityoffice.net

Tamer Sahin
http://www.securityoffice.net
PGP Key ID: 0x2B5EDCB0 Fingerprint:
B96A 5DFC E0D9 D615 8D28 7A1B BB8B A453 2B5E DCB0

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