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210-250 · Question #145

Endpoint logs indicate that a machine has obtained an unusual gateway address and unusual DNS servers via DHCP. Which option is this situation most likely an example of?

The correct answer is C. Man in the middle attack. A machine receiving a rogue default gateway and malicious DNS servers via DHCP is the hallmark of a DHCP spoofing attack, which sets up a man-in-the-middle position for the attacker.

Threats and Vulnerabilities

Question

Endpoint logs indicate that a machine has obtained an unusual gateway address and unusual DNS servers via DHCP. Which option is this situation most likely an example of?

Options

  • ACommand injection
  • BPhishing
  • CMan in the middle attack
  • DEvasion methods

How the community answered

(56 responses)
  • A
    4% (2)
  • B
    13% (7)
  • C
    77% (43)
  • D
    7% (4)

Why each option

A machine receiving a rogue default gateway and malicious DNS servers via DHCP is the hallmark of a DHCP spoofing attack, which sets up a man-in-the-middle position for the attacker.

ACommand injection

Command injection involves inserting malicious commands into application input fields to execute on a server; it operates at the application layer and is entirely unrelated to DHCP lease responses or network configuration.

BPhishing

Phishing relies on deceptive emails or fake websites to steal credentials from users; it does not involve manipulating network-layer DHCP assignments to redirect traffic.

CMan in the middle attackCorrect

In a DHCP spoofing attack, a rogue DHCP server races the legitimate one to respond to client DISCOVER messages and assigns itself or a controlled host as the default gateway, while supplying attacker-controlled DNS servers. This positions the attacker to intercept, inspect, and potentially alter all traffic between the victim and external networks, which is the defining characteristic of a man-in-the-middle attack.

DEvasion methods

Evasion methods are techniques used to bypass security controls such as IDS signatures or firewall rules; a rogue DHCP server is an active network attack vector, not an evasion technique.

Concept tested: DHCP spoofing enabling man-in-the-middle attack

Source: https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/12-2SX/configuration/guide/book/snoodhcp.html

Topics

#DHCP spoofing#rogue DHCP server#man-in-the-middle#network attack

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