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By following the wrong link, or being served a malicious banner advertisement, you could inadvertently provide an attacker with access to the thermostat that controls the temperature in your home..
Here is an example of some of the data that I’ve exfiltrated from my own Chromecast.
They inherently trust other machines on the network in the same way that you would inherently trust someone you’ve allowed into your home.
They use protocols like Universal Plug and Play (UPn P) and HTTP to communicate freely between one another but are inherently protected from inbound connections from the Internet by means of their router’s firewall.
If you follow a malicious link on the web, the web page you arrive at shouldn’t be able to make an HTTP request to your bank website and leverage your logged in-session there to empty your account. (DNS) provides a useful mechanism of translating easy-to-remember domain names into the IP addresses that our computer’s actually use to talk to each other. DNS can be abused to trick web browsers into communicating with servers they don’t intend to.
Browsers restrict this behavior by limiting HTTP requests originating from a domain to access only other resources that are also located on that domain (or another domain that explicitly enables are different domains and therefor the browser treats them as separate origins. The catch is that modern browsers use URLs to evaluate same-origin policy restrictions, not IP addresses. DNS rebinding has received a few brief moments of attention over the past year when vulnerabilities were found in a few popular pieces of software.