The correct immediate action is to remove the public read permission on the S3 bucket. This directly stops unauthorized access to the file containing credit card numbers, containing the breach in accordance with PCI DSS incident response requirements, without destroying the evidence needed for forensic analysis. The core technical concept here is that S3 bucket policies and ACLs control data exposure at the resource level; revoking public read access eliminates the attack vector instantly, whereas deleting the file or the bucket would violate PCI DSS evidence preservation mandates. On the Certified Cloud Security Professional CCSP exam, this scenario tests your understanding of cloud incident response procedures and the principle of least privilege, often appearing as a trap where candidates mistakenly choose to delete the object or disable the entire bucket. A useful memory tip is “Revoke, don’t remove”—always revoke the permission first to contain the breach while keeping the data intact for investigation.
CCSP Legal, Risk and Compliance Practice Question
This CCSP practice question tests your understanding of legal, risk and compliance. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 financial institution uses a multi-cloud strategy with AWS and Azure. They must comply with PCI DSS. The security team found that a developer accidentally stored a file with credit card numbers in an S3 bucket that is publicly readable. Which immediate action should be taken to contain the breach?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Remove the public read permission on the bucket.
Option C is correct because removing the public read permission on the S3 bucket immediately stops unauthorized access to the file containing credit card numbers, containing the breach in accordance with PCI DSS incident response requirements. This action does not destroy evidence (unlike deletion) and directly addresses the root cause—the bucket's misconfigured access control list (ACL) or bucket policy that allowed public read access. It is the fastest way to prevent further data exfiltration while preserving the file for forensic analysis.
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.
✗
Delete the file immediately.
Why it's wrong here
Deleting the file removes evidence needed for investigation.
✗
Enable default encryption on the bucket.
Why it's wrong here
Encryption protects data at rest but does not prevent public access.
✓
Remove the public read permission on the bucket.
Why this is correct
This stops further exposure while preserving the file for forensic analysis.
Related concept
Read the scenario before looking for a memorised answer.
✗
Revoke the developer's IAM credentials.
Why it's wrong here
Revoking credentials does not change the bucket ACL; the bucket remains public.
Common exam traps
Common exam trap: answer the scenario, not the keyword
ISC2 often tests the misconception that deleting the file or revoking credentials is the fastest containment step, but the trap here is that the root cause is the public permission, not the file's existence or the developer's identity—removing public access stops all anonymous access instantly, which is the correct containment action per incident response best practices.
Detailed technical explanation
How to think about this question
S3 bucket policies and ACLs are evaluated at the resource level; removing the public read permission (e.g., via the S3 Block Public Access feature or by editing the bucket policy) immediately revokes anonymous access without requiring a full bucket scan. Under the hood, AWS S3 uses a request authorization model where both identity-based policies and resource-based policies must allow access; removing the public read permission updates the resource-based policy to deny all anonymous principals. In a real-world PCI DSS scenario, the security team would also enable S3 server access logging and initiate a forensic snapshot of the bucket before modifying permissions to preserve evidence.
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 developer is choosing between AES-256 (symmetric) and RSA-2048 (asymmetric) for encrypting a large file that will be sent to a partner. Symmetric encryption is fast but requires key exchange; asymmetric is slower but solves the key distribution problem. A hybrid approach — encrypt the file with AES, encrypt the AES key with RSA — is standard. Questions like this test whether you understand when each approach applies.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Legal, Risk and Compliance — This question tests Legal, Risk and Compliance — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Remove the public read permission on the bucket. — Option C is correct because removing the public read permission on the S3 bucket immediately stops unauthorized access to the file containing credit card numbers, containing the breach in accordance with PCI DSS incident response requirements. This action does not destroy evidence (unlike deletion) and directly addresses the root cause—the bucket's misconfigured access control list (ACL) or bucket policy that allowed public read access. It is the fastest way to prevent further data exfiltration while preserving the file for forensic analysis.
What should I do if I get this CCSP 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.
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 →
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.
This CCSP 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 CCSP 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.