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    Delphis Consulting Plc

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   Security Team Advisories

       [25/08/2000]



    securityteam@delphisplc.com

  [http://www.delphisplc.com/thinking/whitepapers/]



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Adv     :       DST2K0023

Title   :       Directory Traversal Possible & Denial of Service in Worm

HTTP Server

Author  :       DCIST (securityteam@delphisplc.com)

O/S     :       Microsoft Windows NT v4.0 Workstation (SP6)

Product :       Worm HTTP Server v1.0

Date    :       25/08/2000



I.    Description



II.   Solution



III.  Disclaimer





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I. Description

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Vendor URL: http://www.wormonline.com/software.htm



Delphis Consulting Internet Security Team (DCIST) discovered the following

vulnerabilities in Worm HTTP Server under Windows NT.



Severity: medium



It is possible to cause a denial of service by passing a very log filename

in the url. This causes the Worm HTTP server to crash with a 'runtime error'

causeing denial of service.



Severity: high



It is possible to traverse directories lower than the web root by knowing

the exact path and filename of the file you wish to retrieve. This is

done by executing the double-dot-bug similar to other web servers.



II. Solution

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Vendor Status: Informed



The work around for the directory traversal exploit will only work under

WindowsNT. Due to the fact that the Worm HTTP server runs as the useraccount



which started it allows you to set appropriate NTFS permissions to limit the



files the webserver is able to access.



III. Disclaimer

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THE INFORMATION CONTAINED IN THIS ADVISORY IS BELIEVED TO BE ACCURATE AT

THE TIME OF PRINTING, BUT NO REPRESENTATION OR WARRANTY IS GIVEN, EXPRESS OR

IMPLIED, AS TO ITS ACCURACY OR COMPLETENESS.  NEITHER THE AUTHOR NOR THE

PUBLISHER ACCEPTS ANY LIABILITY WHATSOEVER FOR ANY DIRECT, INDIRECT OR

CONSEQUENTIAL LOSS OR DAMAGE ARISING IN ANY WAY FROM ANY USE OF, OR RELIANCE

PLACED ON, THIS INFORMATION FOR ANY PURPOSE.

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