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CCSP Practice Question: Is reviewing a cloud application that uses AWS S3…
A security engineer is reviewing a cloud application that uses AWS S3 buckets. Which vulnerability is most specific to cloud environments and is often exploited to access sensitive data?
⚠ Common exam trap
ISC2 CCSP often tests the distinction between cloud-specific misconfigurations (like exposed S3 buckets) and traditional application vulnerabilities (like SQL injection or XSS), trapping candidates who confuse general web app flaws with cloud-native risks.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Exposed S3 buckets with public read access
Exposed S3 buckets with public read access are a cloud-specific misconfiguration vulnerability because they rely on the AWS S3 bucket policy or ACL settings that grant unauthenticated access to objects. Unlike traditional on-premises vulnerabilities, this arises from improper cloud resource configuration, allowing attackers to enumerate and download sensitive data directly via HTTP/HTTPS requests without any authentication.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Buffer overflow
Why it's wrong here
Buffer overflow corrupts process memory in running code and cannot expose S3 objects held in object storage. It is tempting because it is a classic data-breach vector, and it would be correct for unpatched native software accepting oversized input beyond allocated memory bounds.
- ✗
SQL injection
Why it's wrong here
SQL injection manipulates relational database queries and does not address S3 bucket policies, ACLs or object permissions. It is tempting because it is a headline data-exposure vulnerability, and it would be correct against a web application passing unsanitised input to a SQL database.
- ✓
Exposed S3 buckets with public read access
Why this is correct
Public read access on an S3 bucket exposes objects directly to unauthenticated internet users, bypassing application controls entirely. This cloud-specific misconfiguration is the most common cause of sensitive data exposure, since bucket policies and ACLs are frequently set permissively during development.
- ✗
Cross-site scripting (XSS)
Why it's wrong here
XSS is a general web vulnerability, not cloud-specific.
Visual reference
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.