Ensure Bucket Policy Does Not Grant Write Permissions to Public Rule

Rule Description:

Troubleshooting Steps:

2. 1.
   Check the current bucket policy for the CloudDefense bucket.
4. 2.
   Verify that no "Statement" allows public write access to the bucket.
6. 3.
   Identify and rectify any misconfigured or overly permissive policies.

Necessary Codes:

Step-by-Step Guide for Remediation:

2. 1.
   Access the AWS Management Console and log in to your account.
4. 2.
   Open the S3 service.
6. 3.
   Locate the CloudDefense bucket and click on its name to open the bucket details.
8. 4.
   Go to the "Permissions" tab.
10. 5.
    Look for the "Bucket Policy" section and click on the "Edit" button.
12. 6.
    Review the existing bucket policy JSON in the policy editor.
14. 7.
    Check if any "Statement" allows public write access.

    • If there is a statement with "Effect" set to "Allow" and "Principal" set to "*", validate if it grants public write access.
    • Ensure the actions listed in the statement do not include "s3:PutObject" or any other write-related permissions.
16. 8.
    If a statement allows public write access, remove that particular statement.
18. 9.
    Save the updated policy by clicking on the "Save" button.
20. 10.
    After updating the policy, it is recommended to test the permissions thoroughly to ensure the desired access restrictions are in place.

Verification:

2. 1.
   Attempt to write an object to the CloudDefense bucket using public access credentials or an anonymous user.
4. 2.
   If the policy was implemented correctly, the write operation should be denied, and an appropriate error message will be displayed.