[NT] Vizer Web Server DoS

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To: list@securiteam.com
Date: 18 Feb 2004 15:42:55 +0200

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  Vizer Web Server DoS
------------------------------------------------------------------------

SUMMARY

 <http://sourceforge.net/projects/vizerwebserver/> Vizer is "an open
source web server written in Visual Basic". A vulnerability in the product
allows remote attackers to cause the product to become unable to service
any additional requests by sending malformed HTTP requests.

DETAILS

Vulnerable Systems:
 * Vizer Web Server version 1.9.1

The program doesn't well menage the input strings received, so an attacker
is able to crash the web server, sending a crafted string. To test the
vulnerability, send to the web server a string like:

index.htm
(without specifying GET and HTTP)

Or:
GET /aaaaaa[ 250 of a ]aaa HTTP/1.1
(specifying GET and HTTP)

GET /aaaaaa[ 250 of a ]aaa
(specifying only GET)

Or:
GET c:\
(specifying only GET)

ADDITIONAL INFORMATION

The information has been provided by <mailto:fdonato@autistici.org>
Donato Ferrante.

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