Tagged Questions

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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145 views

Is there any live ZRTP mitm attack demostrtion?

I'm a student and currently try to create demonstration of libzrtp mitm attack. I've spent hours searching trough google - and there is no any useful information. Does anyone have any experience with ...
2
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1answer
85 views

MITM vs. data leakage

We are designing a web API - accessible via https only - but two schools of thought seem to have arisen among our team: Group 1 wants to adopt an approach that is more concerned about data leakage ...
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2answers
208 views

Man-in-the-middle SSL generation on request possible

I am doing some research on man-in-the-middle focusing on SSL in particular. I have been looking into generating a certificate on request when a client connects and requests a secured page. ...
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0answers
158 views

Routing Protocol Encryption

As far as I know 'newer' versions of routing protocols support authentication between routers. What about encryption and integrity checks? Some implementations like this one from Cisco use MD5, which ...
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2answers
204 views

Understanding certificate security

I am reading Computer Networks by Tanenbaum and Weatherall. In chapter 8 they describe secure communication using public key exchange via certificates. They describe a situation where Alice is sending ...
5
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0answers
610 views

Why is it not possible for an ISP to man-in-the-middle attack an SSL connection? [duplicate]

If the ISP carries my data, why do people seem to think they cannot see the contents? Wouldn't they be holding the key?
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2answers
258 views

Is it true, that using symetric encryption, if attacker knows encrypted text, original message, and algorithm means he can calculate the secret?

I am a newbie in the security field, so sorry for the naive question. In my understanding, using symetric encryption, if attacker knows encrypted text, original message, and algorithm means he can ...
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1answer
240 views

Man in the middle attack [duplicate]

How data can be modified in a man in the middle attack? is there any video demonstrating that,any how to guide,i need practical material ,i have used cain and abel,ettercap but now i am strucked i ...
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2answers
3k views

How to detect the NSA MITM attack on SSL?

As Bruce Schneider reported here... https://www.schneier.com/blog/archives/2013/09/new_nsa_leak_sh.html ...the NSA reportedly performed a MITM attack on a company in brazil and decrypted their SSL ...
7
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1answer
250 views

Are there any reasons why browsers should block mixed passive content by default?

Most browsers block "active" content that's being loaded over HTTP on HTTPS pages. This includes stuff like javascript which can be modified with an MITM and compromise the security of the entire ...
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4answers
429 views

Comparing Man-in-the-Middle with Man-in-the-Browser

According to OWASP the Man-in-the-Browser (Malware-in-the-Middle) attack uses the same approach as Man-in-the-middle attack, but the differences is that interception is done at the application layer ...
11
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1answer
15k views

How does SSLstrip work?

I've been reading up on SSLstrip and I'm not 100% sure on my understanding of how it works. A lot of documentation seems to indicate that it simply replaces occurrences of "https" with "http" in ...
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2answers
913 views

Sniffing From Squid SSL

I created a Squid proxy and a self-signed SSL certificate. The SSL certificate on the server is a private certificate linked to the ssl-bump feature. I am using tshark to dump the SSL traffic, but I ...
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0answers
360 views

Does ZRTP provide useful protection, given that the SAS is not verified?

Firstly, some important backstory. I'm producing a corporate version of an IM/VOIP/Screensharing client using the Open Source Jitsi. We are going to be using a central server and have already ...
3
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2answers
615 views

Why does Google SSL cert change so frequently?

For the last few months I have been using the Firefox addon Certificate Patrol to watch for changes to sites' SSL certs - so as to know if I am being MTIMed, against which SSL otherwise provides no ...
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3answers
216 views

How do I mitigate a MITM on https?

I am trying to view a https site (which worked perfectly fine till yesterday) and Chrome is showing me that the site's security certificate is not trusted. I am on a home network. How can I know if ...
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2answers
2k views

Man in the middle attack still possible against ssl?

I've heard about ssl strip in the past that allowed for man in the middle attacks to take place against browsers, but those vulnerabilities were patched long time ago. So my question is...are there ...
4
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1answer
460 views

What are the alternative to PKI certificates in mesh networks?

My particular problem has to do with secure communications over a mesh network (http://en.wikipedia.org/wiki/Mesh_network), in particular man-in-the-middle (MITM) attacks. The difficulty is that mesh ...
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3answers
8k views

How to prevent man-in-the-middle attacks beside of SSL?

I would like to discuss this scenario: There is a HTTPS service which responds with signed keys to an authenticated client. These signed keys can be used for another service to return very sensible ...
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4answers
918 views

What are the risks associated with SSL interception in an Organization?

If an SSL interceptor is installed for security reasons in an Organization, and a certificate from intermediate CA is installed on all domain machines, what kind of risks this setup presents?
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1answer
368 views

Can manual hash verification defend against a DH MITM attack?

I understand how DH key exchange is vulnerable to a MITM attack. When Alice sends Bob g, p and her public key, if she also sent a value H that was a hashing of the values g,p, and public key all ...
0
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1answer
367 views

Network ARP poisoned with Cain but Fiddler not modifying HTML.

The Situation I have successfully used Cain to ARP poison my phone and traffic is being routed via my PC. I have confirmed this in Wireshark and Cain is also able to recover passwords for my SMTP and ...
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3answers
340 views

Get info encrypted across a MITM proxy

All current protocols seem to only fail when MITMed. For example, SSL displays a huge red warning when somebody tries to MITM using a different certificate. Is there any protocol that can actually ...
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1answer
3k views

Is it safe to disable SSH host key checking if key-based authentication is used?

I have some tasks that go like so: Spin up some new EC2 instances (Amazon Web Services) Get them to execute a task Kill them The problem is that they're (seemingly) randomly assigned an IP ...
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3answers
447 views

If a MITM has your public key and you are SSH-ing through the MITM, what is the maximum attack it can perpetrate?

Firstly, let me start by saying that I am not attempting to hack anyone or anything (not that I would know how or where to begin, if I were). For illustration purposes, let's call the primary key ...
4
votes
3answers
2k views

How do I capture POST data then forward user to another page?

I currently have a demo site setup where I load the login form over HTTP and then POST to a HTTPS URL. The aim is to demonstrate that this is not a secure method of handling the login. I'm using ...
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2answers
355 views

Avoiding MITM attacks when using HTTPS over mobile

There are a variety of other questions that address elements of this security issue, but none that seem (to a non-expert) to address the substantial core of the issues raised in this article: ...
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2answers
518 views

Prevent my site to be sniffed and changed by man-in-the-middle-attacks

I want to secure site which is locally used for Prepaid Services, the site has been hacked many times, for the first step, I implemented SSL and its now working fine, however, I want to be sure that ...
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3answers
3k views

Can I listen to a remote IP's traffic using Wireshark? (Man in the Middle)

How can I listen to a remote IP's traffic using Wireshark? (Man in the Middle)
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5answers
959 views

What are the advantages of multi-level authentication?

By multi-level authentication, I am referring to the fact that the user makes use of a primary username password keypair to log into his account. Then, to perform some other actions, such as authorize ...
8
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1answer
581 views

Is it possible to recognise and prevent MitM attacks on devices which use self-signed SSL certs?

I use both Linux and Windows at work on a large enterprise LAN. The majority of the network configuration is out of my reach. Certain SaaS applications that are hosted locally on the enterprise LAN, ...
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3answers
181 views

How can someone access data that I am requesting when I use HTTP?

I have heard that HTTP use plain text communication. If it is so how can a hacker or someone tap it. From my little knowledge I know that if we sent a request to a web server it replies back to us ...
1
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1answer
351 views

Assuming no MITM, is Gmail communication 100% secure and private?

I sometimes have to use my personal Gmail account from my company workstation, where I know for fact they are using content-aware firewall(s) like Palo Alto, and potentially other nasty things like ...
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2answers
13k views

Specific risks of embedding an HTTPS iframe in an HTTP page

I need help listing the specific risks of embedding an HTTPS iframe that enables credit card checkout inside of an HTTP page. Are there security issues with embedding an HTTPS iframe on an HTTP page? ...
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3answers
780 views

Can a nation-state adversary perform a MITM attack by compelling a CA to issue them with fake certs?

As I understand it, with any encryption system based on a trust chain / CAs (eg SSL, TLS, S/MIME), it would be possible for a nation-state adversary (such as the NSA) to compel the CA to issue them ...
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2answers
511 views

Why is malwarebytes.org's SSL certificate from someone else?

I tried downloading and updating malwarebytes from https://www.malwarebytes.org but their certificate seems to be incorrect. This is the warning: This is probably not the site you are looking for! ...
3
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1answer
6k views

House owner can see who's connected to WiFi; what more can he see?

I live in a rental house, and use the house-owner's wireless network to connect to the internet. The owner can see who is connected to his wireless network and I had a few questions regarding this ...
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1answer
698 views

Man-in-the-middle attack over an encrypted channel

I learned recently about man-in-the-middle attacks and came up with this question. Let's say we have two computers who try to communicate over the network. Each computer has an encryptor and a ...
6
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1answer
151 views

public key distribution from a central server

I'm trying to code up a encrypted communication program. Originally I was thinking that I would use public key cryptography and then I would keep the public keys in a database where users could query ...
6
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3answers
444 views

How to fuzz proprietary protocol over SSL?

I'm doing vulnerability research on a client/server architecture that uses a custom proprietary protocol sent over SSL (port 443). I need to be able to intercept the traffic, and be able to view it in ...
5
votes
1answer
965 views

is it possible to sniff email content inside network?

I am working in a IT company. I am using LAN for all internet activities. I send some email from my personal gmail account. My network administrator sniffed all email I send from LAN and he shows the ...
2
votes
1answer
837 views

how to make socat ignore client certificate?

I'm trying to set up a listener to check if an application checks the server's certificate (I'm strongly assuming it is not). So I've created a self-signed certificate fake.pem for a listener and am ...
3
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1answer
1k views

MITM and replay attacks prevention

I have a client (a mobile app) and a server, the app connects to the server via SSL. The server uses a self-signed certificate, and the client has a file (I'm not entirely sure what, something to do ...
3
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1answer
751 views

How to MiTM insert an iframe using burp or another tool?

So, I am trying to obtain a cookie without the secure flag enabled over HTTPS. After reading about it, I came across an answer: You visit https://secure.example.com/ which drops a cookie on your ...
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2answers
1k views

How do I block LinkedIn from extracting data from Microsoft Exchange Server?

LinkedIn now offers the ability to take a real user and password from the end user and connect to Exchange Server for the purpose of importing contacts into their system. (To do this yourself, click ...
2
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3answers
3k views

Can attackers steal SSL certificate from server and use it for MITM attacks?

I'm writing an iOS app for private use to acts as a client for a PHP server. To secure the connection I'm using a self-signed SSL certificate. Since the server is self-hosted, on the first connection ...
3
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3answers
345 views

Two-way secure communication using two pairs of public/private keys?

Let's say I want to create a protocol to securely communicate between two endpoints - each of the two endpoints know the other's public key and all data exchanged is encryted using one's public key ...
3
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1answer
221 views

How is the TLS protected against length field of the header being modified?

I know this question looks very silly, but, it has been bothering me for a while and I am unable to come up with an answer by myself. So, here it goes.. Packets in the TLS protocol consist of a 5 ...
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1answer
339 views

What is a man in the middle attack?

My university provided me with the following slide which is confusing me: From my understanding, what is happening here is that Trudy (Person in the middle) is pretending to be Alice. Bob then ...
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1answer
142 views

Are there any situations when one can only mount a passive MITM?

This came up while discussing Web & insecure HTTP - Using RSA for encrypting passwords on the client side Is there any such situation possible when requesting an HTTP page where an attacker is ...