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NEW QUESTION # 152
The principal security analyst for a global manufacturer is investigating a security incident related to abnormal behavior in the ICS network. A controller was restarted as part of the troubleshooting process, and the following issue was identified when the controller was restarted:
SECURE BOOT FAILED:
FIRMWARE MISMATCH EXPECTED UXFDC479 ACTUAL 0x79F31B
During the investigation, this modified firmware version was identified on several other controllers at the site. The official vendor firmware versions do not have this checksum. Which of the following stages of the MITRE ATT&CK framework for ICS includes this technique?
Answer: B
Explanation:
The technique described in the scenario, where modified firmware with an altered checksum is found on multiple controllers, aligns with the Persistence stage of the MITRE ATT&CK framework for ICS (Industrial Control Systems). Persistence involves ensuring that an adversary can maintain access to a system even after reboots, credential changes, or other defensive measures. The manipulation of firmware is a classic method used by attackers to ensure that they can maintain control over a system or device across reboots or resets, which is a key characteristic of the Persistence stage.
NEW QUESTION # 153
Which of the following best describes the challenges associated with widespread adoption of homomorphic encryption techniques?
Answer: D
Explanation:
Homomorphic encryption allows computations to be performed on encrypted data without decrypting it, preserving confidentiality. However, its adoption faces significant challenges due to performance overhead. According to the CompTIA SecurityX CAS-005 study materials (Domain 3: Cybersecurity Technology, 3.3), homomorphic encryption requires substantial computational resources, which standard processors struggle to provide efficiently. Specialized hardware, such as coprocessors (e.g., GPUs or TPUs), is often needed to handle the complex mathematical operations involved. The lack of widespread, optimized coprocessor support in existing infrastructure is a primary barrier to adoption.
Option A (Incomplete mathematical primitives): While early homomorphic encryption schemes had limitations, modern schemes (e.g., CKKS, BFV) have mature mathematical foundations, making this less of a challenge today.
Option B (No use cases): Use cases exist, such as secure cloud computing and privacy-preserving data analytics, so this is not accurate.
Option C (Quantum computers): Homomorphic encryption is not dependent on quantum computing, and quantum computers are unrelated to its current challenges.
Option D (Insufficient coprocessor support): This is the most accurate, as performance bottlenecks require specialized hardware that is not yet widely available or integrated.
Reference:
CompTIA SecurityX CAS-005 Official Study Guide, Domain 3: Cybersecurity Technology, Section 3.3: "Evaluate emerging cryptographic technologies, including homomorphic encryption challenges." CAS-005 Exam Objectives, 3.3: "Analyze barriers to adopting advanced encryption techniques."
NEW QUESTION # 154
A security manager at a local hospital wants to secure patient medical records. The manager needs to:
- Choose an access control model that clearly defines who has access to sensitive information.
- Prevent those who enter new patient information from specifying who
has access to this data.
Which of the following access control models is the best way to ensure the lowest risk of granting unintentional access?
Answer: A
Explanation:
Mandatory Access Control (MAC) enforces centrally defined policies that determine access to sensitive data, such as medical records. It prevents users who create or enter new data from assigning permissions, thereby reducing the risk of unintentional or improper access.
NEW QUESTION # 155
An organization determines existing business continuity practices areinadequateto support critical internal process dependencies during a contingency event. Acompliance analystwants the Chief Information Officer (CIO) to identify the level ofresidual riskthat is acceptable to guide remediation activities. Which of the following does the CIO need to clarify?
Answer: A
Explanation:
Comprehensive and Detailed Explanation:
* Understanding Residual Risk:
* Residual riskis the amount of risk remainingafter controls and mitigations have been applied.
* Risk appetitedefines the level of risk an organization iswilling to acceptbefore taking additional actions.
* Why Option D is Correct:
* TheCIO must clarify the organization's "Risk Appetite"to determinehow much residual risk is acceptable.
* If risk exceeds the appetite,additional security measuresneed to be implemented.
* This aligns withISO 31000andNIST Risk Management Framework (RMF).
* Why Other Options Are Incorrect:
* A (Mitigation):Mitigation refers toreducing risk, but it doesn't define the acceptable level of residual risk.
* B (Impact):Impact assessment measurespotential damage, but it does not determine what is acceptable.
* C (Likelihood):Likelihood is theprobability of risk occurring, but not what level isacceptable.
NEW QUESTION # 156
A security analyst is reviewingsuspicious log-in activity and sees the following data in the SICM:
Which of the following is the most appropriate action for the analyst to take?
Answer: C
Explanation:
The log-in activity indicates a security threat, particularly involving the ADMIN account with a high-risk failure status. This suggests that the account may be targeted by malicious activities such as credential stuffing or brute force attacks.
Updating log configuration settings (A) may help in better logging future activities but does not address the immediate threat.
Changing the admin account password (B) is a good practice but may not fully mitigate the ongoing threat if the account has already been compromised.
Blocking employees (C) from logging into non-business applications might help in reducing attack surfaces but doesn't directly address the compromised account issue.
Implementing automation to disable accounts associated with high-risk activities ensures an immediate response to the detected threat, preventing further unauthorized access and allowing time for thorough investigation and remediation.
References:
CompTIA SecurityX guide on incident response and account management.
Best practices for handling compromised accounts.
Automation tools and techniques for security operations centers (SOCs).
NEW QUESTION # 157
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