An adversary exploits a weakness in the server's trust of client-side processing by modifying data on the client-side, such as price information, and then submitting this data to the server, which processes the modified data. For example, eShoplifting is a data manipulation attack against an on-line merchant during a purchasing transaction. The manipulation of price, discount or quantity fields in the transaction message allows the adversary to acquire items at a lower cost than the merchant intended. The adversary performs a normal purchasing transaction but edits hidden fields within the HTML form response that store price or other information to give themselves a better deal. The merchant then uses the modified pricing information in calculating the cost of the selected items.
The targeted site must contain hidden fields to be modified.
The targeted site must not validate the hidden fields with backend processing.
The adversary must have the ability to modify hidden fields by editing the HTTP response to the server.
Manipulating hidden fields to change the normal flow of transactions (eShoplifting)
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July 31, 2017
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