S3 and Storage Exposure
Public buckets.
Why Storage Buckets Leak
Object storage like AWS S3, Azure Blob, and GCP Cloud Storage is one of the most common sources of cloud data breaches. Buckets are easy to create and easy to misconfigure.
- Accidentally set to public read or write
- Predictable names that can be guessed
- Overly broad bucket policies or ACLs
A single public bucket can leak millions of records.
How S3 Naming Works
S3 bucket names are globally unique and map to predictable URLs. This predictability is exactly what makes enumeration possible.
Anyone who guesses a valid bucket name can probe its access level.
# Two equivalent S3 URL forms
https://my-bucket.s3.amazonaws.com/
https://s3.amazonaws.com/my-bucket/
# Region-specific endpoint
https://my-bucket.s3.eu-west-1.amazonaws.com/All lessons in this course
- Cloud Attack Surface
- IAM Misconfigurations
- S3 and Storage Exposure
- Metadata and SSRF