A man-in-the-middle attack (MiTM) is an attack against a communication protocol where the attacker relays and modifies messages in transit. The parties believe they are talking to each other directly, but in fact both are talking to the attacker.

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Tor website HPKP (key pinning) failure

I'm currently facing a key pinning error when trying to access the torproject.org website with Firefox. Is anyone facing the same problem? Does anyone know if they changed their certificate? If not, ...
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For attackers looking to launch arp spoof on a target, does the attack have to happen in real time?

I was surfing the web at 3 in the morning and I got a warning which seems to indicate a MITM attack. Does this mean the attacker was able to passive sniff my activity in real-time in order to launch ...
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81 views

is it easier to eavesdrop on ethernet connection rather than wifi?

I heard someone say that ethernet connection is vulerable if someone can connect to your LAN, and that the traffic isn't encrypted in the way it might be if you're using WPA wifi encryption. Is this ...
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462 views

How to know if I'm under a MITM attack

If I am connected in a public WiFi, is there any way to know whether I am under attack or not while browsing sites using SSL? For example, if I visit facebook.com and the URL starts with "https://", ...
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63 views

What are some ways to spot email spoof attacks?

I use Gmail and I started getting malicious-sounding emails from people I know intimately. The people I spoke to said they did not send those emails. In order for the attacker to carry this off, are ...
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105 views

Man in the Middle Attack against NTP

So, lately I've been really into penetration testing and learning the nitty-gritty of tech. I'm dong courses on computer architecture, cryptography, surveillance law, and computer networks. I never ...
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41 views

Influence of SSL Intercept on SSLVPN

We're considering implementing an SSL Intercept proxy in my organization. It will perform a SSL MITM to be able to inspect traffic. It will be a solution of a commercial vendor. It is clear that we ...
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35 views

If I install a certificate for the purposes of logging into a Wifi connection, is it still safe?

There are some wifi networks (large universities for example) which use HTTPS to get to a login page, and in order to verify that they have not been spoofed, provide the certificate ahead of time ...
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35 views

Security of nested ssh

First of all, by nested ssh, I mean the following way of using ssh: ssh usera@Bob 'ssh usera@C' suppose A wants to login on server C, but for some reason C is not directly available to A (e.g. C's ...
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128 views

How can I tell if my ethernet connection is being sniffed? [duplicate]

I read in another post that wired traffic is not protected: The only real additional threat that a malicious network administrator would pose, is that they have access to the wired side of the ...
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20 views

Can Bluetooth be man in the middle'd at the L2CAP layer?

Bluetooth HID devices can be man in the middle'd with two bluetooth dongles and this code http://ossmann.com/shmoo-2010/ Is this technique limited to just HID profile bluetooth devices or could this ...
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Unrecognized leaf certificate

Every 15 minutes or so I get this message in my system.log Apr 25 22:05:36 Ivans-MacBook-Pro.local apsd[194]: Unrecognized leaf certificate Apr 25 22:20:57 Ivans-MacBook-Pro.local apsd[194]: ...
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70 views

Faking IP address without being aware of returning response

I read different articles on the subject (Spoofing IP address), someone said: Spoofing an IP is usually better suited to "fire-an-forget" scenarios like DDoS. due to TCP two-way communication ...
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507 views

hsts bypass with sslstrip2 + dns2proxy

I am trying to understand how to bypass HSTS protection. I've read about tools by LeonardoNve ( https://github.com/LeonardoNve/sslstrip2 and https://github.com/LeonardoNve/dns2proxy ). But I quite ...
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58 views

Why am I sometimes spontaneously presented with an SSL certificate from my U-Verse Residential Gateway?

Sometimes, we will experience a brief "hiccup" in our AT&T UVerse internet service. When this happens, and a user happens to be surfing the web at the same time, we will suddenly be presented with ...
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59 views

How can MITM be performed in WebRTC?

From what I could tell, certificates are self-signed. When A wants to call B, after they finish relaying data to server, they initiate communication with each other. Certificates are self-signed, ...
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66 views

Is it possible for an attacker to redirect a packet sent by a client, modify it then sent to original server

Theoretical question: Is it possible, or will it ever be possible, for an attacker to sniff/intercept it and redirect a packet, sent from a client through wireless, modify it and then sent to the ...
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38 views

Sniffing TLS / SSL through HSTS?

Imagine the following: Client C wants to communicate with server S. The evil attacker A is the Man-In-The-Middle. C sends a request to S, A intercepts it. A creates a self-signed certificate with ...
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Problem creating evil twin using airbase-ng [migrated]

I am trying to create an evil twin access point using airbase-ng.I am creating a hotspot using my mobile and connecting anther mobile to this hotspot.Now I am trying to create an evil twin access ...
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56 views

Does HTTPS protocol leak HTTP body length?

It seems that in a MITM attack, hackers may know the whole HTTPS packet size sent through the network (i.e. size of HTTP headers + HTTP body + overhead). Besides that, does the HTTPS protocol also ...
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53 views

Protect SSL connections from MITM for users with modified clients

I'm working on a web app that uses SSL. I'm afraid that some people might access the app via a network that uses a proxy to intersect and inspect the SSL traffic [MITM]. Some people might access the ...
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237 views

SSL traffic manipulation through ettercap MitM and iptables

I am trying to understand the relation between some tools and concepts used for MitM on a wifi network and how https transaction (over this wifi network) between an android app and the respective ...
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486 views

Can a wifi provider decrypt HTTPS usind MITM without users noticing? [duplicate]

As a router, can I send forged certificates, and intercept requests to CA and return responses that they are valid. So I could MITM all https traffic, and spy on my users?
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48 views

ARP poison detection [duplicate]

I tried ARP poison on my local test system with ettercap. It was successfully, so I decided to run a test on most secure systems, like Facebook and Google, but I could not reach them and they warned ...
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69 views

Risks associated with HTTP content injection?

I'm curious about the risks associated with HTTP content injection, where an ISP injects content to pages accessed over non HTTPS connections. Some examples: ...
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MITM sniffing packets

I fail to understand how a MITM attack sniffs packets and modifies them.In the case of ARP spoofing although the attacker has spoofed the MAC address of a host, how does he modify it as the IP layer ...
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How can a web application protect IE users when this browser doesn't support HSTS?

HTTP Strict Transport Security (HSTS) is a very useful feature at preventing OWASP a9 violations and attacks like SSLStrip which try and prevent the client from making a secure connection. My ...
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Is facebook to facebook (mobile application call ) encrypted?

I understand facebook uses WebRtc to send voice data packet in network if any one end client is on the browser. Use of DTLS packets can be seen in captured (wireshark) file. But in case of mobile app ...
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Perform SSL MITM -> Decrypt packet -> Modify packet -> Encrypt packet -> Send it [closed]

I have a victim and a server. My goal is to intercept traffic, perform SSL MITM, decrypt packet, modify it, encrypt and send it further. Everything has to be on-the-fly and protocol agnostic. For now ...
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What to do about “approved” direct banking MITM sites like sofort.com?

Brussels Airlines allows several payment types, only two of which are free: Maestro and Sofort Banking: The second option was new to me, but direct debit is usually a free and practical way to pay: ...
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Man in the middle attack theory [duplicate]

Me and my colleague are trying to come up with a way around preventing a theoretical man in the middle attack. The scenario is: Communication is only through one channel and either sides isn't ...
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53 views

Is it safer to store valuable information on a unsecure client or send the data through the internet?

Background: I'm creating a secure web app with the purpose to act as a no-knowledge storage for small data (we're talking a few bytes). Since all the encryption and decryption happens client-side, ...
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Any tools like PuTTY for manually stepping through network communications?

Are there any tools that would allow me to "manually" step through the network-stack processes of a device connecting to a network and communicating with other devices? Similar to using PuTTY to ...
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Does MITM attack work across Remote Systems?

I have question about if MITM works across remote systems? Often, I'm doing internal penetration test, but I'm not sure about how to do MITM attack when I am outside from that network. Does classic ...
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217 views

Chat encryption system avoiding protocol sniffing and then key+decryption replay?

I'm working on a chat system and I want to add it some kind of security (not just HTTPS with SSL since I've read it can be sniffed and decrypted with a few tools). Now, my knowledge in cryptography is ...
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133 views

How does OTR's authentication using “Question and answer” protect against MiTM?

I've read that the answer has something to do Socialist Millionaire, but I still don't understand how can the user be protected against malicious Man In The Middle, which would capture the question ...
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Which systems in a network are able to spoof a TCP handshake?

I am reviewing for my final exam tomorrow, I came across a past exam question. An attacker wants to initiate a TCP handshake with a target to make him think E initiated it, attacker knows IP ...
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Would my protocol be safe?

Suppose I have a protocol like the one below between users A and B; -A sends random nonce G1 to B -B sends back hash_k(G1) and random none G2 -A verifies hash_k(G1), then sends back hash_k(G1 | ...
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Prevent MITM between custom phone app and local server

We're building a Wifi enabled device. The device will be installed locally on each client's office and people in the the small office will connect to this Wifi enabled device, They will send/receive ...
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560 views

Does the SSL termination happen with the ISP or a mobile service provider? [duplicate]

Is it true that when I connect to a site over HTTPS , my mobile service provider or the ISP gets to snoop in the communication? Can they play MITM?
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How does a Short Authentication String (SAS) mitigate MITM attacks?

Reading about Silent Circle, and more specifically Silent Text, I learnt that by implementing SAS, the likelyhood of a MITM attack is greatly reduced. Could someone please explain how this works? If ...
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Does mutual authentication have any impact on MiTM possibilities?

When doing a Man-in-the-middle attack against a classic one-way authentication server, the attacker just have to: Use a certificate credible enough to be trusted by the victim, Act as a standard ...
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Is there any possibility that a trusted CA can perform a man in middle attack? [duplicate]

Is there any possibility that a trusted CA can perform a man in middle attack? Since the CA certificate is installed and trusted by the browser it will never raise a warning message. Hope my doubt ...
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157 views

How do google or facebook know I'm behind a man in the middle proxy?

Whenever I'm behind a man in the middle proxy such as burp, and try to access either google or facebook, I get an alert message telling me that the connection is not reliable and blocks the page from ...
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2k views

SSL / TLS Renegotiation Handshakes MiTM Plaintext Data Injection- medium or low risk?

This is a Nessus finding, which is considered medium by default. Basically it may allow for some plaintext injection which may allow for some man in the middling. My question is, has these been ...
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Distinguish between Wi-Fi Captive portal and MitM attack

Not sure whether this should be asked in Super User or here. How does Chrome distinguish between a Wi-Fi access point intercepting with a captive portal and a man-in-the-middle attack on HTTPS? Are ...
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ssl_error_bad_certificate_domain, does Firefox still validate the certificate? [duplicate]

I have a private NAS device. It uses a self-signed SSL certificate. I can import the cert into Firefox and everything works as long as I'm accessing the device from somewhere on the internet. SSL ...
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109 views

someone may be doing something nasty

I have an ssh server. earlier toady, I was about to login to my server, when I got a message that said something along the lines of "Someone may be trying to do something nasty" and indicating a man ...
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How to recreate the Freak attack?

Currently I am trying to recreate the Freak attack on a virtual machine. For this purpose I set up a Linux Mint 17.1 system with Apache 2.4.7 (with a self signed certificate) and OpenSSL 1.0.1f. I ...
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“Authorized” Man in the middle

I am implementing a TLS connection with a basic server and client. It’s a one way connection: the server has a certificate chained to the CA, and the client has a collection of trusted root ...