Cloud Spotlight: Insecure Storage

Cloud Spotlight: Insecure Storage

What is the main security issue in insecure cloud storage?

Cloud storage objects may be publicly accessible without intended authorization.

Which three major cloud storage technologies are discussed?

Amazon S3, Google Cloud Storage buckets, and Azure Blob storage.

What does S3 stand for in Amazon S3?

Simple Storage Service.

What kinds of information may exposed buckets contain?

Documents, backups, sensitive customer data, or other stored files.

How did early cloud storage defaults contribute to data exposure?

Some services initially allowed public access unless administrators restricted it.

What is the usual default for creating cloud buckets today?

Public access is restricted by default.

Which MITRE ATT&CK technique ID covers data from cloud storage objects?

T1530.

What is the name of MITRE ATT&CK T1530?

Data from Cloud Storage Object.

What does AWS S3 Block all public access do by default?

Blocks public access to a newly created bucket.

Can an AWS administrator change the public-access setting?

Yes. An administrator can alter the restrictive policy.

What does ACL stand for?

Access Control List.

Why may publicly accessible cloud buckets still exist?

Misconfiguration, misunderstanding of permissions, or later reuse of public buckets.

What bucket name is used in the AWS configuration example?

falsimentis-media.

What protocol enables broad access to cloud object storage?

HTTP, optionally secured with TLS/HTTPS.

What is the Amazon S3 URL pattern shown in the book?

https://s3.amazonaws.com/BUCKETNAME

What alternate AWS S3 URL pattern is shown?

BUCKETNAME.s3.amazonaws.com

What is the Google Cloud bucket API URL pattern shown?

https://www.googleapis.com/storage/v1/b/BUCKETNAME

What is the Azure Blob storage URL pattern shown?

https://ACCOUNTNAME.blob.core.windows.net/CONTAINERNAME

Which two names identify an Azure Blob storage endpoint?

Storage account name and container name.

Can an Azure account and container have the same name?

Yes.

How are potential cloud storage endpoints enumerated?

Try candidate bucket names or account/container combinations at provider URLs.

What tool does the book use for Amazon S3 bucket discovery?

Bucket Finder (bucket_finder.rb).

Who wrote the Bucket Finder tool discussed in the book?

Robin Wood.

What input does Bucket Finder require?

A text file of candidate bucket names, one per line.

What does Bucket Finder report?

Whether a bucket exists and whether access is allowed or denied.

What does Bucket Finder --download do?

Downloads content from publicly accessible buckets.

Why should --download be used cautiously?

It can retrieve large quantities of potentially sensitive or unwanted data.

What does Bucket Finder report for a nonexistent name?

Bucket does not exist.

What does "Bucket found but access denied" indicate?

The bucket exists, but the request lacks permission.

Does Bucket Finder include a bucket-name wordlist?

No. The analyst supplies a wordlist.

What example command runs Bucket Finder on a file called words?

bucket_finder.rb words --download

What tool does the book use for Google Cloud bucket discovery?

GCPBucketBrute.

What organization developed GCPBucketBrute?

Rhino Security Labs.

What can GCPBucketBrute enumerate besides bucket names?

Bucket permissions, when enumeration is allowed.

What does GCPBucketBrute -u mean?

Perform unauthenticated permission checks.

What does GCPBucketBrute -k specify?

A keyword used to generate candidate bucket names.

What does GCPBucketBrute --check-list specify?

Use a supplied list of candidate bucket names.

What command checks unauthenticated Google buckets using a keyword?

gcpbucketbrute.py -u -k falsimentis

How many bucket permutations appear in the course example?

1,216.

What does storage.objects.list permission allow?

Listing objects within a cloud bucket.

What does storage.objects.get permission allow?

Reading an object in cloud storage.

What does UNAUTHENTICATED ACCESS ALLOWED indicate?

A bucket permits access without authentication.

Can GCPBucketBrute download objects from a public bucket?

No. The book uses gsutil for object access.

Which command lists objects in the example Google bucket?

gsutil ls gs://falsimentis-dev

Which tool is used for Azure Blob discovery in Book 4?

Basic Blob Finder (basicblobfinder.py).

What input format can Basic Blob Finder use?

accountname:containername, one candidate per line.

How does Basic Blob Finder interpret an entry without a colon?

It uses the same value for the account and container names.

What does Basic Blob Finder identify?

Publicly accessible Azure blobs and their file listings.

What command scans the file namelist for Azure blobs?

basicblobfinder.py namelist

What does a colon separate in Basic Blob Finder input?

The storage account name from the container name.

Why are default cloud bucket wordlists not always sufficient?

They may miss an organization’s unique naming conventions.

What information can improve cloud bucket name guesses?

Organization names, abbreviations, products, and common environment suffixes.

Which example suffixes are discussed for bucket names?

dev, files, data, qa, and test.

How can OSINT help bucket discovery?

It reveals names and conventions administrators might use.

What does GCPBucketBrute automatically generate from keywords?

Name permutations with prefixes and suffixes.

What does CTI stand for?

Cyber Threat Intelligence.

What CTI service indexes exposed cloud buckets?

Grayhatwarfare.

What can Grayhatwarfare help a defender identify?

Exposed organizational buckets and publicly indexed files.

Which four providers does the book say Grayhatwarfare covers?

AWS, Azure, Google Cloud, and DigitalOcean.

What page lists random example bucket names on Grayhatwarfare?

https://buckets.grayhatwarfare.com/random/buckets

What does curl -s mean in the Grayhatwarfare example?

Fetch the URL in silent mode.

Why is grep -E used with cloud provider domain endings?

To retain lines matching the listed cloud storage domains.

What does $ mean at the end of the grep pattern?

Anchor the match at the end of a line.

What is the key defensive action for cloud bucket exposure?

Audit storage configurations and eliminate unintended public permissions.

Which cloud storage access events should be logged?

Both successful and failed access attempts.

How can network logs help defenders investigate bucket exposure?

They can reveal access to storage endpoints across the organization.