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Smart TVs communicate with (and accept communication from) online media services, smart locks allow themselves to be unlocked by phones or keypads, digital cameras contact social media services, and smart meters communicate with the users utility company. Such communication, along with other functionalities of the device, is handled by software (termed firmware) embedded in the device. Because these devices often receive privacy-sensitive information from their sensors (such as what a user is watching, or how much electricity they are using), or carry out a safety-critical function (such as actuators that lock the front door), errors in the devices firmware, whether present due to an accidental mistake or purposeful malice, can have serious and varying implications in both the digital and physical world. Firmware, like any piece of software, is susceptible to a wide range of software errors. These include memory corruption flaws, command injection vulnerabilities and application logic flaws. Another common error seen in firmware is a logic flaw called an authentication bypass or less formally, a backdoor. An authentication bypass occurs when an error in the authentication routine of a device allows a user to perform actions for which they would otherwise need to know a set of credentials. In other cases, backdoors are deliberately inserted by the manufacturer to get access to deployed devices for maintenance and upgrade. Detecting vulnerabilities and backdoors in firmware is challenging for several reasons. To begin with, the devices in question are usually proprietary, and therefore the source code of the firmware is not available. While this is a problem common to analyzing binary software in general, firmware takes it one step further: firmware often takes the form of a single binary image that runs directly on the hardware of the device, without an underlying operating system. Because of this, OS and library abstractions do not exist in some cases, and are non-... Read more↗

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Updated1 year ago
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Keywordsus moore spread spectrum satcom hacking attacking the globalstar simplex data service pdf global star
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