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Remote DoS Attack in Small HTTP Server ver. 1.212 Vulnerability

USSR Advisory Code:   USSR-2000047

Release Date:
June 16, 2000

Systems Affected:
Small HTTP Server ver. 1.212 (maybe others)

THE PROBLEM

The Ussr Labs team has recently discovered a buffer overflow memory
problem in the Small HTTP Server.

What happens is by preforming an attack with a malformed url
information to port 80 it will cause the proccess containg the
services to stop responding.

SPECIAL NOTE: That we take no responsibility for this code it is for
educational purposes only.

Example:
The http Server (Port 80) service has a overflow in the GET command

[hellme@die-communitech.net$ telnet example.com 80
Trying example.com...
Connected to example.com.
Escape character is '^]'.
GET /[buffer]

Where [buffer] is aprox. 65000 characters.

and the process containg the service crash


Vendor Status:  
Informed!

Vendor   Url: http://wwwwin.wplus.net/pp/mrdoors/srv/index.htm
Program  Url: http://wwwwin.wplus.net/pp/mrdoors/srv/sethttp.exe

Related Links:

Underground Security Systems Research
http://www.ussrback.com

Greetings:
Eeye, Attrition, w00w00, beavuh, Rhino9, SecurityFocus.com, ADM, HNN,
Technotronic and Wiretrip.

Copyright (c) 1999-2000 Underground Security Systems Research.
Permission is hereby granted for the redistribution of this alert
electronically. It is not to be edited in any way without express
consent of Ussr. If you wish to reprint the whole or any part of this
alert in any other medium excluding electronic medium, please e-mail
labs@ussrback.com for permission.

Disclaimer:
The information within this paper may change without notice. Use of
this information constitutes acceptance for use in an AS IS
condition. There are NO warranties with regard to this information.
In no event shall the author be liable for any damages whatsoever
arising out of or in connection with the use or spread of this
information. Any use of this information is at the user's own risk.

Feedback:
Please send suggestions, updates, and comments to:

Underground Security Systems Research
mail:labs@ussrback.com
http://www.ussrback.com

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