IAM Access Analyzer is the correct service for identifying Amazon S3 buckets that are shared with another AWS account. Here's why:
IAM Access Analyzer Features:
- Resource Analysis: Helps identify resources (like S3 buckets) that are shared with an external entity
- Cross-Account Access Detection: Specifically designed to find resources accessible from outside your AWS account
- Security Best Practices: Part of AWS security services that help maintain least-privilege access
Why Other Options Are Incorrect:
- AWS Lake Formation: Used for building, securing, and managing data lakes, not for identifying cross-account access
- IAM Credential Report: Provides information about IAM users and their credentials, not resource sharing
- Amazon CloudWatch: Used for monitoring and observability, not for identifying cross-account resource access
IAM Access Analyzer continuously monitors your AWS environment and alerts you when resources are shared with external entities, making it the ideal choice for this security requirement.
