6 HTTP MITM Attack Tools for Security Researchers

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Protecting Against MITM: A Deep Dive into 6 Must-Have HTTP Attack Tools for Security Researchers

MITM (man-in-the-middle) attacks are one of the top threats facing organizations today. By intercepting communication between two parties, attackers can secretly spy on and manipulate data with potentially catastrophic consequences. As cybersecurity researchers, having the right tools to find MITM vulnerabilities before the bad guys exploit them is absolutely essential.

In this comprehensive 4500+ word guide, we‘ll provide an in-depth look at 6 of the most powerful HTTP-focused MITM testing tools available and how to put them to work protecting your systems. You‘ll also get best practices to safeguard against these pernicious attacks. Let‘s get started!

What is a MITM Attack and How Does it Work?

First, a quick MITM refresher. A MITM attack occurs when a malicious actor inserts themselves secretly into a conversation between two parties. They’re able to monitor and modify data as it passes back and forth.

MITM attack diagram
Image via Imperva

Common MITM techniques include:

  • Packet sniffing – Inspecting data packets at a low level to obtain unauthorized access to their contents.

  • Packet injection – Introducing forged packets into the communication channel that blend in with legitimate traffic.

  • Session hijacking – Stealing session tokens used to authenticate users so the attacker can impersonate them.

  • SSL stripping – Downgrading HTTPS connections to plain unencrypted HTTP to view sensitive data in transit.

When successful, the impact of MITM attacks can be severe. According to recent research from Imperva, the average cost of a data breach is now a staggering $4.35 million. Attackers often use MITM as an initial vector to infiltrate networks and exfiltrate valuable data.

Some common consequences include:

  • Credentials theft – Usernames, passwords, API keys, etc. used for identity theft and account takeovers.

  • Financial theft – Payment information, customer data used for fraud and embezzlement.

  • Trade secret theft – Source code, designs and other intellectual property, enabling espionage and counterfeiting.

  • Ransomware – MITM enables malicious software installation for encrypting data.

  • Disinformation – Spreading false data to manipulate markets, public opinion, etc.

Simply put, MITM attacks open the door for criminals to inflict financial, reputational and operational damage. That‘s why identifying these vulnerabilities before they can be exploited needs to be a top priority.

Now let‘s explore 6 of the most robust MITM testing tools designed specifically for analyzing and manipulating HTTP-based traffic.

Hetty – Comprehensive HTTP Toolkit for MITM Testing

Hetty is an open source HTTP toolkit purpose-built for security professionals and bug bounty hunters. It functions primarily as an HTTP proxy, allowing you to intercept web traffic between clients and servers for inspection and manipulation.

As a security researcher, having granular visibility into HTTP communications is invaluable for identifying weaknesses. Some key features that make Hetty such a powerful ally:

  • Full text search – Dig through months of captured HTTP data in seconds right from your browser.

  • Sender module – Manually construct malicious requests based on patterns in captured traffic.

  • Attacker module – Automatically send malicious requests like XSS and SQLi to uncover vulnerabilities.

  • Simple to use – Installs in minutes; intuitive browser-based UI for easy traffic analysis.

  • Lightweight – Written in Golang, low resource consumption compared to tools like Burp.

MITM flaws like plaintext HTTP, missing HSTS headers, and more become blatantly obvious after intercepting traffic with Hetty. It makes auditing HTTP security controls a breeze.

Hetty is 100% open source and free to use. Over 75 contributors have helped build it into one of the most capable HTTP debugging tools available today.

Bettercap – Swiss Army Knife for Network Recon & MITM Testing

Bettercap is another extremely popular open source tool tailored for network reconnaissance, MITM testing and more. It allows deeply analyzing and manipulating networks across a variety of protocols – not just HTTP.

Bettercap can probe and attack WiFi, Bluetooth LE, IPV4/IPV6 and Ethernet segments. It’s like a versatile Swiss army knife for practically any scenario you’ll encounter during security research.

Some of Bettercap‘s more notable capabilities:

  • Powerful sniffing to passively harvest credentials, session tokens, juicy metadata and more.

  • Spoofing – Impersonate other device types on the network for deeper recon.

  • Intuitive CLI – Perform advanced MITM attacks through the interactive console interface.

  • Traffic manipulation – Inject, modify HTTP, HTTPS and TCP traffic on the fly based on powerful packet shaping rules.

  • Extensible modules – Community-built add-ons for expanding functionality.

When doing MITM testing, Bettercap makes it trivial to scan for weaknesses, harvest relevant data, then launch surgical attacks to prove vulnerabilities. All in a lightweight, easy-to-use package.

Over 7000 GitHub stars later, Bettercap remains one of the most trusted MITM testing tools among bug bounty hunters and red teams. It should definitely be a staple in your toolkit. – Lightweight HTTP/HTTPS Swiss Army Knife is an easy-to-use HTTP, HTTPS and HTTP2 proxy server written in Python. Don’t let its minimalist design fool you though – it’s a powerful ally for runtime traffic manipulation.

Some key capabilities:

  • Lightning fast – Runs on the AsyncIO library, allowing thousands of concurrent connections.
  • Low resource – Consumes only 5-20MB RAM for the proxy process.
  • Self-contained – No external dependencies outside Python‘s default libraries.
  • TLS encryption – End-to-end traffic encryption between proxy and client for security.
  • Programmable API – Modify proxy behavior dynamically through code.
  • Real-time dashboard – Monitor metrics and control proxy via web UI. makes it trivial to intercept traffic from mobile apps, web services and other HTTP-based clients to uncover vulnerabilities. Having the ability to inspect and manipulate requests in transit is invaluable during testing.

It’s also highly scalable. The proxy can handle thousands of concurrent connections with minimal overhead. For high-volume MITM testing, is a reliable choice.

Mitmproxy – Powerful SSL-Enabled HTTP Debugging Proxy

Mitmproxy has earned its reputation as one of the most capable open source HTTP proxies for security research. It allows deep inspection and manipulation of HTTP/HTTPS traffic with surgical precision.

Some notable features:

  • SSL interception – Decrypt TLS connections on the fly to debug encrypted traffic.
  • Live editing – Modify requests and responses as they flow past.
  • Session playback – Record traffic then replay scenarios for further testing.
  • Reverse proxy – Forward traffic to other backends as needed.
  • Extensible Python API – Programmatically extend core functionality.

For security testing, Mitmproxy excels at unraveling the complexities of HTTP-based apps and services. Poor TLS configuration, session management flaws, injection vulnerabilities – Mitmproxy practically hands you these findings on a silver platter compared to manual debugging. It also integrates seamlessly with tools like nmap, Wireshark and Burp for comprehensive testing capabilities.

For seasoned penetration testers, Mitmproxy is an essential tool for the kind of surgical HTTP exploits needed to demonstrate risk. Over 9K GitHub stars later, it remains one of the most trusted open source proxies available.

Burp Suite – The Swiss Army Knife for Web Security Testing

Chances are you’ve heard about Burp Suite before. It’s become a staple of the web security community relied on by professionals across the industry.

As a web vulnerability scanner, Burp’s capabilities are extensive – too many to list here. For our purposes, we’ll focus on its proxy server functionality for advanced MITM testing:

  • Raw TCP/IP control – Send custom payloads and manipulate traffic at the packet level.

  • De-encrypt TLS – Break HTTPS connections to inspect encrypted data.

  • Intercept cookies – Steal and manipulate authenticaion and session management tokens.

  • Crawler integration – Send interesting requests from Burp‘s crawler to the proxy for manipulation.

  • Powerful scanner – Automatically detect flaws like SQLi, XSS and more.

  • Extensible via addons – Add custom functionality using BApps and Python.

As an all-in-one web security platform, Burp delivers tremendous value through its comprehensive MITM capabilities blended with automation. For large scale testing, it‘s an invaluable asset.

The biggest drawback with Burp is cost. Licensing starts at $399 per user annually for the Professional edition required for MITM support. For professional pen testers and large organizations it’s well worth the investment, but for individual researchers the free version is too limited.

Ettercap – A Veteran MITM Hacking Tool for Experts

First released in 1998, Ettercap is one of the oldest MITM tools still widely used today. It provides seasoned security researchers low-level control for advanced MITM testing across a variety of protocols:

  • Broad protocol support – Manipulate IPv4/6, TCP, UDP, ICMP, DHCP, ARP packets and more.
  • Password harvesting – Sniff out and decrypt credentials from intercepted traffic.
  • Active vs. passive analysis – Toggle between stealthy observation or live manipulation.
  • Fingerprinting – Determine OS versions and host configurations through fingerprinting techniques.
  • Customizable filters – Refine your view using criteria like IP, MAC address, host name, etc.
  • Plug-in architecture– Extend functionality through plugins.

Ettercap gives you the tools security researchers need to dissect network communication at a protocol level. While not as polished as some commercial alternatives, Ettercap provides uncommon visibility and control. For seasoned penetration testers, it remains an essential instrument.

Don‘t let its dated interface fool you – at over 20 years old, Ettercap has proven its ability to hack with the times. It still sees frequent updates and remains one of the most robust open source MITM tools around.

Protecting Against the MITM Menace

Now that you have a solid grasp of tools for uncovering MITM flaws, let‘s discuss best practices for safeguarding your environment:

  • Utilize a web application firewall (WAF) – Inspect incoming traffic for threats and block attacks in real-time.

  • Perform frequent penetration testing – Utilize tools like the ones highlighted here to probe for weaknesses before attackers do.

  • Enforce TLS 1.2+ – Disable outdated SSL/TLS versions prone to downgrade attacks.

  • Employ mutual authentication – Require both client and server to provide valid certificates to connect.

  • Monitor for anomalies – Inspect network traffic regularly for unusual patterns indicative of MITM.

  • Enable HSTS preloading – HSTS reduces risk of SSL stripping on your domain.

  • Educate staff – Ensure employees understand social engineering techniques used to initiate attacks.

  • Follow the least privilege principle – Only allow access to resources required for a user‘s duties.

  • Deploy robust IDS/IPS monitoring – Rapidly detect potential threats and terminate sessions.

With a layered security approach, organizations can effectively minimize the attack surface and risks for MITM-based intrusions. But it takes continuous vigilance – persistent testing paired with defensive monitoring is key.

Go Forth and Hack Securely!

And there you have it – we‘ve explored 6 of the top HTTP-focused tools security researchers rely on to identify MITM vulnerabilities and reproduce exploits. Each brings unique capabilities to the table for mimicking the techniques real-world attackers will use.

Remember, MITM attacks start by targeting low hanging fruit. Plaintext HTTP, weak ciphers, inadequate authentication – these types of flaws provide easy footholds for infiltrating networks further.

Regularly putting your own systems, devices and apps through rigorous MITM testing is crucial. Don‘t give criminals the upper hand. Deploy these tools proactively, fix what they uncover, and help lock out adversaries before your data ends up in the headlines.

Here‘s wishing you stellar success in securing critical assets and stopping cyber attacks in their tracks. Go forth and hack responsibly!


Written by Alexis Kestler

A female web designer and programmer - Now is a 36-year IT professional with over 15 years of experience living in NorCal. I enjoy keeping my feet wet in the world of technology through reading, working, and researching topics that pique my interest.