CS0-003 Vulnerability Management Practice Question
This CS0-003 practice question tests your understanding of vulnerability management. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
During a penetration test, an analyst successfully exploits a privilege escalation vulnerability to gain root access on a Linux server. The server is used for application development. Which of the following remediation actions would be MOST effective in preventing similar attacks?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Apply the principle of least privilege to user accounts
The principle of least privilege ensures that users and processes have only the minimum permissions necessary to perform their tasks. By applying this to user accounts, the attack surface for privilege escalation is reduced because even if an account is compromised, the attacker cannot easily escalate to root. This directly addresses the root cause of the vulnerability exploited in the scenario.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Deploy a host intrusion detection system
Why it's wrong here
HIDS detects attacks but does not prevent privilege escalation.
✗
Harden the kernel using sysctl parameters
Why it's wrong here
Kernel hardening is beneficial but not the most effective single measure against privilege escalation.
✗
Implement application whitelisting
Why it's wrong here
Whitelisting prevents unauthorized code but does not address user privileges.
✓
Apply the principle of least privilege to user accounts
Why this is correct
Least privilege limits what an attacker can gain after initial access, reducing the impact.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CompTIA often tests the distinction between detection (HIDS), system hardening (sysctl), execution control (whitelisting), and access control (least privilege), expecting candidates to recognize that preventing privilege escalation requires limiting permissions rather than just monitoring or restricting specific binaries.
Detailed technical explanation
How to think about this question
Privilege escalation often exploits misconfigured sudoers entries, SUID binaries, or weak file permissions (e.g., world-writable scripts run by root). Applying least privilege involves auditing and restricting sudo access (e.g., using sudoers rules with specific commands and no password caching), removing unnecessary SUID bits, and ensuring user accounts are in the correct groups (e.g., not in the 'wheel' or 'sudo' group unless required). In a real-world scenario, a developer account with sudo access to a build script could be used to execute arbitrary commands as root if the script is modifiable.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A security team runs a vulnerability scan on a web application and discovers an unpatched SQL injection flaw. The team prioritises remediation by CVSS score — critical flaws are patched within 24 hours, high within 7 days. Questions like this test whether you understand vulnerability management processes, scanning tools, and remediation prioritisation.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CS0-003 question in full detail.
Vulnerability Management — This question tests Vulnerability Management — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Apply the principle of least privilege to user accounts — The principle of least privilege ensures that users and processes have only the minimum permissions necessary to perform their tasks. By applying this to user accounts, the attack surface for privilege escalation is reduced because even if an account is compromised, the attacker cannot easily escalate to root. This directly addresses the root cause of the vulnerability exploited in the scenario.
What should I do if I get this CS0-003 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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