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          Delphis Consulting Plc
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         Security Team Advisories
             [22/09/2000]

          securityteam@delphisplc.com
      [http://www.delphisplc.com/thinking/whitepapers/]
  
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Adv     :       DST2K0036
Title   :       Price modification possible in CyberOffice Shopping Cart
Author  :       DCIST (securityteam@delphisplc.com)
O/S     :       Microsoft Windows NT 4 Server (SP5)
Product :       CyberOffice Shopping Cart v2
Date    :       22/09/2000

I.    Description

II.   Delphis Solution

III.  Vendor Comments

IV.   Disclaimer


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I. Description
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Vendor URL: http://www.smartwin.com.au/smartwin.htm

Delphis Consulting Internet Security Team (DCIST) discovered the following
vulnerability in CyberOffice Shopping Cart v2 under Windows NT.

Severity: high - Price modification possible

It is possible to modify the unit price of items as it is submitted as
a hidden field as part of the order form. By saving a copy of the order
form down locally and modify the value it is possible to submit a order
form with a zero or even negative price value.

example: <input type="hidden" name="Price" value="0">

The vendor solutions relies on referrers and is easily bypassed.

II. Delphis Solution
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Vendor Status: Informed

Currently Delphis recommend the following:

 o Make transactions non-realtime (i.e. Manual authorisation)

III. Vendor Comments
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SmartWin is aware of the problem and has provided solution since about 6
months ago.

Under Global / System Settings of the Shop Manager, you can set Authorized
URL(s) to specify the Web sites (folders) where the shopping pages reside.
This effectively stops the problem you reported in this article.

Typically, merchants will switch on the option for real-time services.

IV. 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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