DST2K0023: Directory Traversal Possible & Denial of Service in Wo rm HTTP Server

[Security Team <SecurityTeam () DELPHISPLC COM>]

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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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