The modern enterprise typically exposes more to the internet than they would like. Shodan gives us greater visibility into the insecure, interconnected cyberphysical world in which we all now live. You can’t play defense if you don’t know what you must defend, and this is true equally at both the enterprise level and society as a whole. The real value of Shodan lies in helping defenders gain greater visibility into their own networks. That’s what botnets running zmap are for. Attackers intent on causing harm don’t need Shodan to find targets. This is, of course, hyperbole caused by ignorance. Shodan reveals what’s connected to and visible from the internet, such as this facility How can you let hackers know where all the power plants are so they can blow them up? This is awful! Shodan CNN called it the “ scariest search engine on the internet” in 2013. Shodan gives the example of an FTP banner: A banner publicly declares to the entire internet what service it offers and how to interact with it. Services running on open ports announce themselves, of course, with banners. Shodan finds all the things, indexes all the things, makes searchable all the things. Check the random IPv4 address on the random port and grab a banner Generate a random port to test from the list of ports that Shodan understandsģ. The basic algorithm is short and sweet:Ģ. The best way to understand what Shodan does is to read founder John Matherly’s book on the subject. Google and other search engines, by comparison, index only the web. Shodan is a search engine for everything on the internet - web cams, water treatment facilities, yachts, medical devices, traffic lights, wind turbines, license plate readers, smart TVs, refrigerators, anything and everything you could possibly imagine that’s plugged into the internet (and often shouldn’t be).
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