The client who sent the request will then automatically connect to that network, thinking it knows it. Rogue APsīut it gets worse! Someone could collect the SSID from a received probe request, open a new WiFi network and give it the exact same name, then send a probe response. Systems like this could be used in locations like shopping malls to track the routes of customers. Apple).īecause WiFi clients tend to send probe requests regularly, it's possible to use mesh networks to track their movement. Plus the metadata provided by the MAC address of said clients like the name of the manufacturer (i.e. So by simply listening for probe requests, you can track how many WiFi clients are nearby and where they have been. In addition, services like WiGLE can be used to pinpoint an SSID to a specific location. This data can be used to identify you because your phone is likely to have a unique list of known networks. And not just that, it's probably broadcasting the names of every network you ever connected to! In other words, your phone might be leaking the name of your home network constantly. Meaning the probe request will contain the SSID of a known network in cleartext. They are used simply for network discovery.īut it's common that a device will actively ask for a specific network name. They are not encrypted, since they contain no user data. Probe requests are a type of WiFi management frame. When an access point receives a probe request frame, it will reply with a probe response frame. There are two ways to discover WiFi networks: either by passively waiting and listening for announcements (beacon frames) from access points or by actively asking every WiFi device around if they are a network using probe requests. If you open the WiFi settings menu on your phone, you'll see a list of available networks. So let's have a look at probe requests and what they are used for. If you ever used our ESP8266 Deauther, you might have wondered what the probe attack is for.
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