Home > Glossary > CompTIA Security+ Certification Exam > Man-in-the-Middle (MitM) Attack

📖 What is Man-in-the-Middle (MitM) Attack?

A Man-in-the-Middle (MitM) attack involves an attacker intercepting communication between two parties, secretly relaying and potentially altering the traffic. The attacker positions themselves as an intermediary, gaining access to sensitive information exchanged between the victim and the intended recipient.

🥋 Sensei Says:

"Focus on the mechanisms enabling MitM attacks: ARP poisoning, DNS spoofing, and SSL stripping. Understand how these attacks compromise confidentiality and integrity. Remember that strong encryption protocols like TLS mitigate MitM risks."

📚 Certification: CompTIA Security+ Certification Exam (SY0-701)

🔑 What are the Key Concepts of Man-in-the-Middle (MitM) Attack?

▸ ARP poisoning exploits the trust in ARP, allowing attackers to associate their MAC address with the IP of a legitimate host, intercepting traffic.
▸ DNS spoofing redirects traffic to a malicious server by altering DNS records, enabling attackers to capture credentials or deliver malware.
▸ SSL stripping downgrades HTTPS connections to unencrypted HTTP, allowing attackers to intercept data in transit before encryption is established.
▸ MitM attacks compromise the CIA triad – Confidentiality, Integrity, and Availability – by allowing unauthorized access and potential data modification.
▸ Strong encryption (TLS/SSL) and multi-factor authentication are crucial defenses against MitM attacks, verifying identity and protecting data.

🎯 How does Man-in-the-Middle (MitM) Attack appear on the SY0-701 Exam?

You may be asked to identify the type of attack when a user reports being redirected to a fake login page after clicking a link in an email – consider scenarios involving ARP poisoning or DNS spoofing.

A scenario might describe a network where unencrypted HTTP traffic is prevalent; expect questions about the vulnerabilities this creates for MitM attacks and how to remediate them.

Expect questions about how to detect a MitM attack, such as analyzing network traffic for suspicious ARP requests or unexpected DNS responses.

❓ Frequently Asked Questions

How can I differentiate between ARP poisoning and DNS spoofing in a real-world attack?

ARP poisoning occurs on the local network segment, impacting communication based on MAC addresses. DNS spoofing affects name resolution, redirecting traffic to a different IP address, often originating from outside the local network.

What role does HSTS play in preventing MitM attacks?

HTTP Strict Transport Security (HSTS) forces browsers to only connect to a website over HTTPS, preventing SSL stripping attacks by automatically upgrading HTTP requests to HTTPS.

If a network uses strong encryption, is it completely immune to MitM attacks?

While strong encryption significantly reduces the risk, it's not foolproof. Attacks can still occur during the initial handshake phase or if certificates are compromised. Vigilance and monitoring are still essential.

Related Terms from CompTIA Security+ Certification Exam

Threat Hunting Privilege Escalation Honeypot Containerization Ransomware Penetration Testing

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