System and method for blocking the transmission of sensitive data using dynamic data tainting

摘要

Blocking transmission of tainted data using dynamic data tainting is described. For example, sensitive information is stored on a client device as tainted data. The client device generates a data request for retrieving data from a non-trusted entity via a network. A gateway is communicatively coupled to the client device and the network. The gateway receives computer code from the non-trusted entity via the network. The gateway executes the computer code. The gateway tracks the execution of the computer code to determine whether the computer code attempts to access tainted data and transmit the tainted data to an outside entity. The gateway blocks the transmission of the tainted data to the outside entity responsive to determining that the computer code has attempted to access tainted data and transmit the tainted data to an outside entity.

主权项

1. A computer-implemented method comprising:
in response to determining that a data structure object is a first type, tainting the data structure object by modifying a taint bit of a property field of the data structure object, the data structure object included in first data; tracking, at a gateway device, execution of computer code received from a non-trusted entity via a network, the computer code received by the gateway when sent by the non-trusted entity to a client device in response to a request from the client device, the tracking including identifying that the computer code performs an operation on the tainted first data; when the operation on the tainted first data results in second data, tainting the second data; detecting that the computer code attempts a network transmission to the non-trusted entity; and when the attempted network transmission includes at least one of the tainted first data or the tainted second data, blocking transmission of the at least one of the tainted first data or the tainted second data.