I'm doing some researches for university and, before wasting a lot of time into it, I'd like to know if what I've got in my mind can be done.
I'm talking about a simple MITM attack but, in my scenario, the victim is forced to use a VPN to access the internet.
So here's a quick overview of the scenario:
An open WiFi network (let's call it WIFIUniversity) (gateway is at 192.168.1.1)
A VPN server (IP = 126.96.36.199) which seems to be not reachable from outside the WiFi (or at least it rejects my ping requests)
I've thought to 2 kind of attacks that may work, but the last one seems really unrealistic while I'm writing.
- Using an ARP POISONING tool to make every client think that my PC is the VPN server.
This means that I've got to install and setup a VPN server on my PC (OpenVPN seems good) and act as a server. This will lead to this "chain":
victim -> me -> real vpn server -> network. This may lead to some kind of fake certificate warning, but I can forge a fake certificate that looks like the university one and the user will accept it without thinking that he may be victim of an attack. (Provided that the victim is NOT an IT expert but an ordinary user which doesn't know what a certificate is). So, after all this stuff, the victim's traffic will be redirected to my VPN and this means that I can get the HTTP response from the real VPN and I can change it before encrypting and sending it back to the victim.
- If the VPN uses a gateway that is on my same subnet, I can Arp poison the VPN server to let it think that I'm his gateway to the network and so it'll give me his decrypted requests and I can edit the responses before passing them back to he VPN server. Something like
victim -> real vpn server -> me as a fake gateway -> network.
I've tried to summarize them as I'm not an expert of this kind of things and I just want to know if my ideas are right before starting and investigating on how to do these attacks.
So, please, before linking some long pdf, just reply as straight as possible by saying something like:
Yeah, you're right, point 1 may work
Go and study as you don't know anything about VPN and network security
Thanks in advance!