SydShamino writes: Researches at Indiana University and Microsoft found and exploited flaws in the communication between web stores and third-party cashiers (Amazon Payments, PayPal, Google Checkout) to order items for free, or at prices of their choice. "We believe that it is difficult to ensure the security of a CaaS-based checkout system in the presence of a malicious shopper" said the study co-author. The identified flaws have been reported and fixed, but they feel that more, similar flaws are likely given the complicated nature of many web-based transactions.
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