Ensure that your AWS S3 buckets cannot be publicly accessed for WRITE actions via S3 access control lists (ACLs), in order to protect your S3 data from unauthorized users. An S3 bucket that allows WRITE (UPLOAD/DELETE) access to everyone (i.e. anonymous users) can provide attackers the capability to add, delete and replace objects within the bucket, which can lead to S3 data loss or unintended charges on your AWS bill.
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This rule resolution is part of the Cloud Conformity Security & Compliance tool for AWS
Granting public "WRITE" access to your AWS S3 buckets through S3 ACLs can allow anonymous users to upload, modify and delete S3 objects without permission. Cloud-One Conformity strongly recommends against setting WRITE (UPLOAD/DELETE) permission for the "Everyone" predefined group in production.
To determine if your existing AWS S3 buckets allow public WRITE access, perform the following:
Remediation / Resolution
To remove public WRITE access for your S3 buckets, you need to perform the following:
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You are auditing:
S3 Bucket Public 'WRITE' ACL Access
Risk level: Very High