GMS-2014-27: Validation bypass

December 3, 2014

paypal-ipn uses the test_ipn parameter (which is set by the PayPal IPN simulator) to determine if it should use the production PayPal site or the sandbox. “With a bit of time, an attacker could craft a request using the simulator that would fool any application which does not explicitly check for test_ipn in production.” See provided link.

References

github.com/andzdroid/paypal-ipn/issues/11

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