easyMultiple ChoiceObjective-mapped

CAS-004 Practice Question: Refer to the exhibit

Exhibit

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Principal": "*",
      "Action": "s3:GetObject",
      "Resource": "arn:aws:s3:::mybucket/*"
    }
  ]
}

Refer to the exhibit. A security architect is reviewing this S3 bucket policy. Which of the following security concerns is MOST evident?

⚠ Common exam trap

CompTIA often tests the distinction between a policy that allows public read access (which is a direct security risk) versus other concerns like outdated versions or missing encryption, which are not immediately evident from the policy syntax alone.

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

✓

The policy allows public read access

The policy statement includes an `Effect: Allow` with a `Principal: "*"` and an action of `s3:GetObject`, which grants public read access to all objects in the bucket. This is the most evident security concern because it allows any anonymous user on the internet to read data from the bucket, potentially exposing sensitive information.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✗
The policy denies all write access
Why it's wrong here
The policy only grants GetObject; write access is not granted or denied explicitly.
✓
The policy allows public read access
Why this is correct
The wildcard principal '*' allows any anonymous user to read objects.
✗
The policy uses an outdated version
Why it's wrong here
Version 2012-10-17 is the current version.
✗
The policy lacks encryption
Why it's wrong here
Encryption is not specified in bucket policies; it is handled via bucket properties or server-side encryption.

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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CAS-004 Practice Question: Refer to the exhibit

Exhibit

Why each option matters

Option-by-option breakdown

AWS S3 Storage Class Comparison

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