Man in the middle – Captcha against Mitm attacks works?

I pestered a site that had no security against MITM attacks, and found that when I tried to steal the credentials and attacked myself, the CAPTCHA was unable to connect to the Internet (the site was disconnected from http ) I could not send the credentials to the website and steal them with my other PC.

Is this a standard answer, can it be bypassed? Is it safe to use it to ward off MITM attacks?

While browsing Google, I found that this was not the case, but for some reason, it was good protection when I attacked this site, so I do not really know what to think.

man in the middle – no hsts but still protected against mitm attacks?

I know HSTS and their instructions … However, if you have enabled HSTS on your website and that user has already visited your website, the browser will remember that it should return to https. Since the fake site does not have an SSL certificate, the user can not visit the site and is safe.

However, I can not reproduce a mitm attack if I visited the site before. Only if I delete all cookies and try again, this works perfectly. For some reason, the site behaves as if it had HSTS, but not … so, what's wrong here? If the website does not have HSTS, the browser should not think about connecting to HTTPS

Man in the middle – How do FIDO keys prevent MITM reflection attacks?

FIDO keys used for 2-factor authentication are based on a challenge-response mechanism.

In addition to using diffie-hellman to generate a common 1-time key or transmit all data via TLS, how can they prevent reflection attacks?

Challenge: Alice -> Eve -> Bob

Answer (even if encrypted): Bob -> Eve -> Alice

eve <-> Alice initiates a secure connection.

Routing – Can we use the network hub as a MITM sniffing device?

My intention is to analyze all network traffic coming from and originating from a network connected device. From the configurations of the device I can characterize all the HTTP traffic coming from the device. However, I believe that the device also communicates over other protocols.

The device and my computer are both in a switched network, and I do not want to use ARP cache poisoning to route all the packets through my computer. I'm looking for a simpler solution where I could replace the printer with a hub and then connect the printer to one of the hubs' ports. I also want to connect my laptop to one if the hubs of this hub were introduced to the network. Technically, the hub would flood all packets to all ports, and I should be able to snoop them in promiscuous mode with Wireshark from my laptop.

One problem that I discovered in this approach was finding a & # 39; hub & # 39 ;. The search itself returns "switch" results, which are Layer 2 devices. I am confused about the popular use of the words "switches" and "hubs". What should I buy for this purpose? Should it be a hub or a switch (technically only one hub can be used for this purpose, but I want to know if the devices listed on websites are actually hubs)?

Certificates – What are MITM proxies used for in companies?

My company uses (like many others I suspect) a proxy in the middle with a personal root approx.

Disclaimer : I am not a security expert. Maybe I did not really understand what this network configuration does. Therefore, the following question assumes that this configuration is used to decrypt my HTTPS flux.

My question is what justifies this practice. What are the use cases? Is it possible to catch viruses in traffic? Or is this used to check which sites employees go to and which data they send to the Internet (preventing data leakage)?

Since I do not know why they are using it and they have not told us about it, I think this practice is a violation of privacy. In my case, for example, it is tolerated to check my private mail or even make a quick payment via e-banking. But no one has told us that he can read the data (login / password, account balance, …) that should be encrypted (SSL).

Security – How can Python packages be modified and redirected during the MitM attack?

This is for a CTF challenge. We have a client and a server that communicate with each other on the same subnet as we do. We have to poison them, modify the packages and then forward them

i know how to modify the packages with scapy, and i have already implemented the arp poisoning part of it

The problem I am currently facing is how to connect the received packet received from the socket library and send it to a function that modifies it. Then I can send it I tried socket library

should I have something like this in my Python code? :

s = socket.socket (socket.AF_INET, socket.SOCK_STREAM)
s.bind ((host, port))
s.listening (5)

while true:

conn, addr = s.accept ()

If so, I should start the code. How can I change it using scapy now ?!

can scapy even change the package that was received from the socket?

AND I can not use tools and libraries that need access to the iptables command because access is locked in the operating system (for example, Netfilterqueue).

To edit: I think the other option is just to use sniff (), then change part of it and pass it on. If this is the best option, you can tell me how I can see and change the content of the payload. For example, when I say something like Print (package)[TCP].payload) shows a kind of byte stream, which comes with b & # 39; x44 … & # 39; starts

I tried to decode it with package[TCP].payload.decode (& # 39; utf-8 & # 39;) and ascii, however, did not work and returned the following error: A

ttributeError: decode

I also tried to string it into a string like str (package[TCP].payload) and still did not work.

kali linux – How can I get MITM attack running with sslstrip?

I've done the following:

I modified iptables too Forward to another port:

iptables -t nat -A PREROUTING -p tcp --destination-port 80 -j REDIRECT --to-port 1000

I allowed Port-forwarding:

echo 1> / proc / sys / net / ipv4 / ip_forward

I arpspoofed the gateway and the victim (my mobile Android phone is a Xiaomi Note 5):

arpspoof -i wlan0 -t [victim IP] [gateway IP]

I started sslstrip:

sslstrip -w filename.txt -l 1000

Each of these commands has been executed without mistakesThey seem to work, but nothing is displayed in filename.txt. I just tried arpspoofing in one way, first the gateway, then the victim, resetting the iptables and rewriting rules, but nothing seems to work.

There are two ways to arp score. The victim can not access or access the Internet at all, but sslstrip does not work without delay. I assume that in this case the traffic "flows" through my PC, but sslstrip does not remove it.

How can I see which part of this MITM is not working? Is there something I can check to see if the traffic is being redirected?
Thank you in advance.

wifi – How to prevent a MITM DNS attack by a router

My landlord is very busy and has extreme political views. I suspect he uses a Windows program that communicates with the wireless router to record which websites all tenants visit. I suspect this is not just because of his personality, but also because (A) the wireless router insists on being DNS, and (B) its Windows computer was ruined by the recent Windows 10 update bug he was forced to change the two SSIDs of the wireless router. Normally, SSIDs do not need to be changed because of what happens on a connected computer.

My simple workaround for the router that wanted to be my DNS was always 1.1.1.1, 8.8.8.8 and 9.9.9.9 as my DNSes. However, if its wireless router has the ability to be a DNS MITM, and it is e.g. If it is known that these IPs are known DNSes, it could still record all of my DNS interactions. How can I prevent this?