Internet accessible S3 bucket via policy

Severity: High
Service: S3
Check ID: S3_PUBLIC_POLICY

What this check finds

This S3 bucket allows more public access than simply GetObject. These public privileges should be reduced.

Passing looks like: S3 bucket not publicly exposed via policy.

How to fix it

Remove or restrict the public statements in the bucket policy. Limit access to specific IAM principals.

AWS CLI

If the policy should be removed entirely:

aws s3api delete-bucket-policy --bucket BUCKET_NAME

Names in capitals are placeholders for your own resource. Review a command before you run it.

AWS console

S3 → Bucket → Permissions → Bucket Policy → Edit.

Compliance controls it is evidence for

A failing result counts against these controls in KloudLytics; a passing one is evidence towards them. How compliance mapping works

Compliance controls mapped to Internet accessible S3 bucket via policy
Framework	Controls
PCI-DSS v4.0.1	1.4 Network connections between trusted and untrusted networks are controlled
HIPAA Security Rule	164.308(a)(4) Information Access Management
SOC 2 — Trust Services Criteria	C1.2 Access Restrictions and Secure Disposal
NIST SP 800-53 Rev5 (Moderate)	AC-3 Access Enforcement SC-7 Boundary Protection
NIST Cybersecurity Framework 2.0	PR.AA-05 Access permissions and authorizations are enforced with least privilege PR.IR-01 Networks and environments are protected from unauthorized logical access and usage
ISO/IEC 27001:2022 Annex A	A.5.15 Access control A.8.3 Information access restriction A.8.20 Networks security

Checked on every scan

KloudLytics runs this check each time it scans a connected AWS account, through a read-only role, and lists every affected resource with its region. On Pro and Business a fix is written for the specific resource rather than the general case above. The exact access it needs

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