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CompTIA Exam CS0-002 Topic 9 Question 77 Discussion

Actual exam question for CompTIA's CS0-002 exam
Question #: 77
Topic #: 9
[All CS0-002 Questions]

Which of the following is a vulnerability associated with the Modbus protocol?

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Suggested Answer: D

Modbus is a communication protocol that is widely used in industrial control systems (ICS) and supervisory control and data acquisition (SCADA) systems. However, Modbus was not designed to provide security and it is vulnerable to various cyberattacks. One of the main vulnerabilities of Modbus is the lack of authentication, which means that any device on the network can send or receive commands without verifying its identity or authority. This can lead to unauthorized access, data manipulation, or denial of service attacks on the ICS or SCADA system.

Some examples of attacks that exploit the lack of authentication in Modbus are:

Detection attack: An attacker can scan the network and discover the devices and their addresses, functions, and registers by sending Modbus requests and observing the responses.This can reveal sensitive information about the system configuration and operation1.

Command injection attack: An attacker can send malicious commands to the devices and modify their settings, values, or outputs.For example, an attacker can change the speed of a motor, open or close a valve, or turn off a switch23.

Response injection attack: An attacker can intercept and alter the responses from the devices and deceive the master or other devices about the true state of the system.For example, an attacker can fake a normal response when there is an error or an alarm23.

Denial of service attack: An attacker can flood the network with Modbus requests or commands and overload the devices or the communication channel.This can prevent legitimate requests or commands from being processed and disrupt the normal operation of the system14.

To mitigate these attacks, some security measures that can be applied to Modbus are:

Encryption: Encrypting the Modbus messages can prevent eavesdropping and tampering by unauthorized parties.However, encryption can also introduce additional overhead and latency to the communication56.

Authentication: Adding authentication mechanisms to Modbus can ensure that only authorized devices can send or receive commands.Authentication can be based on passwords, certificates, tokens, or other methods56.

Firewall: Installing a firewall between the Modbus network and other networks can filter out unwanted traffic and block unauthorized access.A firewall can also enforce rules and policies for Modbus communication24.

Intrusion detection system: Deploying an intrusion detection system (IDS) on the Modbus network can monitor the traffic and detect anomalous or malicious activities.An IDS can also alert the operators or trigger countermeasures when an attack is detected24.


by Chaya at Apr 09, 2024, 09:22 PM

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Glenn
6 months ago
That's true, Eve. Weak encryption can expose sensitive data
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Elli
6 months ago
Weak encryption can also pose a risk for Modbus
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Angelica
6 months ago
You're right, Denial of service can disrupt operations
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Lyndia
6 months ago
I believe denial of service is also a vulnerability for Modbus
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Glenn
6 months ago
I agree with lack of authentication can lead to security breaches
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Angelica
7 months ago
I think the vulnerability associated with Modbus is lack of authentication
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Buck
7 months ago
That's true, Hoa. Weak encryption can expose sensitive data
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Hoa
7 months ago
Weak encryption can also pose a risk for Modbus
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Delsie
7 months ago
You're right, Richelle. Denial of service can disrupt operations
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Richelle
7 months ago
I believe denial of service is also a vulnerability for Modbus
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Buck
7 months ago
I agree with Delsie, lack of authentication can lead to security breaches
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Delsie
7 months ago
I think the vulnerability associated with Modbus is lack of authentication
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Lili
8 months ago
Hmm, let me think about this... Based on my understanding, the lack of authentication in Modbus is a major vulnerability. Anyone can connect and send commands without verification.
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Xuan
8 months ago
Ooh, good point Lucy. 'Unchecked user input' does seem like a classic vulnerability, especially for an older protocol like Modbus. We all know how dangerous that can be.
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Wenona
8 months ago
I agree with Adelina. Modbus may be old, but it's not going anywhere anytime soon. We need to be prepared for the real-world challenges, not just the shiny new stuff.
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Lucy
8 months ago
Hmm, I'm not so sure about 'Denial of service.' Isn't that a vulnerability that applies more broadly, not just to Modbus? I'm leaning towards 'Unchecked user input' as the answer.
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Adelina
8 months ago
Hey, don't knock Modbus! It's been around forever, but it's still widely used. Besides, vulnerabilities in legacy protocols are important to know about.
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Janey
8 months ago
Which of the following is a vulnerability associated with the Modbus protocol?
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Eden
8 months ago
Which of the following is a vulnerability associated with the Modbus protocol?
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Janna
8 months ago
Which of the following is a vulnerability associated with the Modbus protocol?
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Dominga
8 months ago
Which of the following is a vulnerability associated with the Modbus protocol?
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Sang
8 months ago
Yeah, that makes sense. And 'Denial of service' also seems plausible - older protocols are often vulnerable to simple network flooding attacks.
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Dierdre
7 months ago
B) Denial of service
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Dierdre
7 months ago
D) Lack of authentication
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Ressie
8 months ago
Ugh, Modbus protocol? Isn't that like the dinosaur of industrial protocols? I thought we were supposed to be tested on modern, secure stuff.
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Angelyn
8 months ago
I agree. My money is on 'Lack of authentication' as the answer. Modbus was designed before cybersecurity was a big concern, so it probably doesn't have robust user verification mechanisms.
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Rochell
8 months ago
Okay, let's think this through. Modbus is an older industrial protocol, so I'm guessing the vulnerabilities are related to its age and lack of modern security features.
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Jerry
8 months ago
Hmm, this Modbus protocol question seems tricky. I definitely remember learning about its security vulnerabilities in class, but I'm not sure I can recall the specifics.
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