Quick Answer
The answer is authentication logs, as they are the most critical log source for detecting privilege escalation attacks. This is because authentication logs record every user identity change, including the execution of privileged commands like 'su' or 'sudo' and modifications to group memberships, which directly indicate a shift in access rights. A SIEM correlates these events with other logs to spot anomalous privilege transitions, such as a standard user suddenly gaining administrative rights—a hallmark of privilege escalation. On the CISSP exam, this concept tests your understanding of the Identity and Access Management (IAM) domain, specifically how log monitoring reveals unauthorized privilege abuse. A common trap is focusing on system or application logs, which show activity but not the identity shift itself. Remember the mnemonic: “Auth logs catch the climb”—authentication logs capture the moment a user escalates privileges, making them the first place to look for lateral or vertical movement.
This CISSP practice question tests your understanding of security operations. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
A company uses a SIEM to correlate logs from multiple sources. Which log source is most critical for detecting privilege escalation attacks?
Authentication logs
Authentication logs contain login attempts and account changes indicative of privilege escalation.
DNS logs
Why wrong: DNS logs show domain resolution, not user authentication events.
Firewall logs
Why wrong: Firewall logs show network traffic, not user account activities.
Web server logs
Why wrong: Web server logs show HTTP requests, not system authentication.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Authentication logs
Authentication logs are most critical for detecting privilege escalation attacks because they record user identity changes, such as the use of 'su' or 'sudo' commands, and account modifications like group membership changes. A SIEM can correlate these events with other logs to identify anomalous privilege transitions, such as a standard user suddenly acquiring administrative rights, which is a hallmark of privilege escalation.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Authentication logs
Why this is correct
Authentication logs contain login attempts and account changes indicative of privilege escalation.
Related concept
Read the scenario before looking for a memorised answer.
DNS logs
Why it's wrong here
DNS logs show domain resolution, not user authentication events.
Firewall logs
Why it's wrong here
Firewall logs show network traffic, not user account activities.
Web server logs
Why it's wrong here
Web server logs show HTTP requests, not system authentication.
Common exam traps
The trap here is that candidates often choose firewall logs or DNS logs because they associate them with detecting attacks in general, but the question specifically targets privilege escalation, which requires logs that capture user identity and privilege changes, not network-level events.
Trap categories for this question
Command / output trap
DNS logs show domain resolution, not user authentication events.
Detailed technical explanation
Privilege escalation often involves the use of system calls like setuid() or the execution of binaries with the SUID bit set, which are logged by the OS audit subsystem (e.g., Linux auditd or Windows Security Event ID 4672). A SIEM can correlate these with authentication logs (e.g., Windows Event ID 4624 for logon and 4648 for explicit credentials) to detect when a low-privileged account performs a privileged action, such as a user in the 'Users' group suddenly running a process as SYSTEM.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A security analyst at a medium-sized enterprise encounters this scenario during an investigation or architecture review. The correct answer reflects best practice for the specific threat or control described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Security exam questions test whether you can match controls to threats in context — not just recall definitions.
What to study next
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Security Operations — study guide chapter
Learn the concepts, then practise the questions
Security Operations practice questions
Targeted practice on this topic area only
All CISSP questions
529 questions across all exam domains
Certified Information Systems Security Professional CISSP study guide
Full concept coverage aligned to exam objectives
CISSP practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Practise CISSP questions linked to Software Development Security.
Practise CISSP questions linked to Security Assessment and Testing.
Practise CISSP questions linked to Identity and Access Management.
Practise CISSP questions linked to Security and Risk Management.
Practise CISSP questions linked to Security Architecture and Engineering.
Practise CISSP questions linked to Communication and Network Security.
Practise CISSP questions linked to Asset Security.
Practise CISSP questions linked to Security Operations.
Practise CISSP questions linked to CISSP fundamentals.
Practise CISSP questions linked to CISSP scenario.
Practise CISSP questions linked to CISSP troubleshooting.
Practice this exam
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Security Operations — This question tests Security Operations — Read the scenario before looking for a memorised answer..
The correct answer is: Authentication logs — Authentication logs are most critical for detecting privilege escalation attacks because they record user identity changes, such as the use of 'su' or 'sudo' commands, and account modifications like group membership changes. A SIEM can correlate these events with other logs to identify anomalous privilege transitions, such as a standard user suddenly acquiring administrative rights, which is a hallmark of privilege escalation.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Last reviewed: Jun 24, 2026
This CISSP practice question is part of Courseiva's free ISC2 certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CISSP exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.