Original source (should replace the current link): https://www.ndss-symposium.org/wp-content/uploads/2026-f1282... Summary: https://www.ndss-symposium.org/ndss-paper/airsnitch-demystif... (hat tip: https://news.ycombinator.com/item?id=47167975 )
@dang, can we get the link and title changed?
AirSnitch: Demystifying and breaking client isolation in Wi-Fi networks [pdf]
61–70 of 204 posts
Re: AirSnitch: Demystifying and breaking client isolation in Wi-Fi networks [pdf]
#62As far as I can tell, all of these attacks require the attacker to already be associated to a victim's network. Most of these attacks seem similar to ones expected on shared wifi (airports, cafes) that have been known about for a while. The novel attacks seem to exploit weaknesses in particular router implementations that didn't actually segregate traffic between guest and normal networks. I'm curious if I missed som…
What about XFinity, which by default shares the wifi you pay for with strangers to create access points around the city?
Re: AirSnitch: Demystifying and breaking client isolation in Wi-Fi networks [pdf]
#63I just read the paper, and my take is that practically every home wifi user can now get pwned since most WiFi routers use the same SSID and 2.4 and 5Ghz. It can even beat people using Radius authentication, but they did not deep dive on that one. I am curious about whether the type of EAP matters for reading the traffic. Essentially everyone with the SSID on multiple access point MAC addresses can get pwned. Neighhoo…
They still need to be able to connect to one of the network no? So a home network without guest would be fine is my understanding?
My concern is doing it asynchronously against things when no one is watching.
Basically it takes turn being the client and the AP both so that it can get the traffic from both. It is an evil twin attack doubled.
It might have broken EAP TLS.
If your wifi is off when you are not using it and you are not getting denial of serviced while using it and you have only one Mac for your SSID, this attack is not occuring.
Re: AirSnitch: Demystifying and breaking client isolation in Wi-Fi networks [pdf]
#64This is a big deal: it means a client on one wifi network can MITM anything on any other wifi network hosted on the same AP, even if the other wifi network has different credentials. Pretty much every enterprise wifi deployment I've ever seen relies on that isolation for security. These attacks are not new: the shocking thing here that apparently a lot of enterprise hardware doesn't do anything to mitigate these triv…
Like as in me being on the Guest network at a business can then read traffic of the Corporate network?
Re: AirSnitch: Demystifying and breaking client isolation in Wi-Fi networks [pdf]
#65I just read the paper, and my take is that practically every home wifi user can now get pwned since most WiFi routers use the same SSID and 2.4 and 5Ghz. It can even beat people using Radius authentication, but they did not deep dive on that one. I am curious about whether the type of EAP matters for reading the traffic. Essentially everyone with the SSID on multiple access point MAC addresses can get pwned. Neighhoo…
> Essentially everyone with the SSID on multiple access point MAC addresses can get pwned You still have to be able to authenticate to some network: the spoofing only allows users who can access one network to MITM others, it doesn't allow somebody with no access to do anything. In practice a lot of businesses have a guest network with a public password, so they're vulnerable. But very few home users do that.
Re: AirSnitch: Demystifying and breaking client isolation in Wi-Fi networks [pdf]
#66Re: AirSnitch: Demystifying and breaking client isolation in Wi-Fi networks [pdf]
#67Original source (should replace the current link): https://www.ndss-symposium.org/wp-content/uploads/2026-f1282... Summary: https://www.ndss-symposium.org/ndss-paper/airsnitch-demystif... (hat tip: https://news.ycombinator.com/item?id=47167975 )
Re: AirSnitch: Demystifying and breaking client isolation in Wi-Fi networks [pdf]
#68I just read the paper, and my take is that practically every home wifi user can now get pwned since most WiFi routers use the same SSID and 2.4 and 5Ghz. It can even beat people using Radius authentication, but they did not deep dive on that one. I am curious about whether the type of EAP matters for reading the traffic. Essentially everyone with the SSID on multiple access point MAC addresses can get pwned. Neighhoo…
They still need to be able to connect to one of the network no? So a home network without guest would be fine is my understanding?
Some people also have passwords easy to break. Friend of mine literally had "hunter22" as WiFi password.
Re: AirSnitch: Demystifying and breaking client isolation in Wi-Fi networks [pdf]
#69I just read the paper, and my take is that practically every home wifi user can now get pwned since most WiFi routers use the same SSID and 2.4 and 5Ghz. It can even beat people using Radius authentication, but they did not deep dive on that one. I am curious about whether the type of EAP matters for reading the traffic. Essentially everyone with the SSID on multiple access point MAC addresses can get pwned. Neighhoo…
> Essentially everyone with the SSID on multiple access point MAC addresses can get pwned You still have to be able to authenticate to some network: the spoofing only allows users who can access one network to MITM others, it doesn't allow somebody with no access to do anything. In practice a lot of businesses have a guest network with a public password, so they're vulnerable. But very few home users do that.
I have been relying on EAP TLS via wifi so my phones could upload their photos and videos to Nextcloud.It was way cheaper than doing it via AWS, which is what I used to do and used ethernet LAN connections only. If this works asynchronously across time to allow authentication to my network which uses EAP TLS, will knock me out of being able to use Nexctloud on my mobile devices since plugging an ethernet in after I take photos is too cumbersome to do very often.
I love Nextcloud, but do not want to pay Amazon for EC2 etc.
My read is this allows them to mimic both client and access point to assemble the handshake and obtain radius authentication. Rather than have to verify a certificate on the client or crack complex passwords, they pretend to the client sending the response it sends when the certificate is verified. Then they switch MAC to the SSID MAC and send the next part to the client. Previous evil twin attacks were one sided rather than basic frame assemblers.
I read that paper as describing a successful reconstruction of the Radius authentication handshakes at layer 2 after the fact for use later rather than caring about actual certificate validations. Basically handing a three letter agency quality tool to the Kali Linux fan club.
I am hoping I read it wrong,
Re: AirSnitch: Demystifying and breaking client isolation in Wi-Fi networks [pdf]
#70As far as I can tell, all of these attacks require the attacker to already be associated to a victim's network. Most of these attacks seem similar to ones expected on shared wifi (airports, cafes) that have been known about for a while. The novel attacks seem to exploit weaknesses in particular router implementations that didn't actually segregate traffic between guest and normal networks. I'm curious if I missed som…
What about XFinity, which by default shares the wifi you pay for with strangers to create access points around the city?