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Access Analyzer for S3 is a new feature that monitors your access policies, ensuring that the policies provide only the intended access to your S3 resources. Access Analyzer for S3 evaluates your bucket access policies and enables you to discover and swiftly remediate buckets with potentially unintended access.
Access Analyzer for S3 alerts you when you have a bucket that is configured to allow access to anyone on the internet or that is shared with other AWS accounts. You receive insights or ‘findings’ into the source and level of public or shared access. For example, Access Analyzer for S3 will proactively inform you if read or write access were unintendedly provided through an access control list (ACL) or bucket policy. With these insights, you can immediately set or restore the intended access policy.
When reviewing results that show potentially shared access to a bucket, you can Block All Public Access to the bucket with a single click in the S3 Management console. You can also drill down into bucket level permission settings to configure granular levels of access. For specific and verified use cases that require public access, such as static website hosting, you can acknowledge and archive the findings on a bucket to record that you intend for the bucket to remain public or shared. You can revisit and modify these bucket configurations at any time. For auditing purposes, Access Analyzer for S3 findings can be downloaded as a CSV report.
To get started with Access Analyzer for S3, visit the IAM console to enable the AWS Identity and Access Management (IAM) Access Analyzer. When you do this, Access Analyzer for S3 will automatically be visible in the S3 Management Console.
Access Analyzer for S3 is available at no additional cost in the S3 Management Console in all commercial AWS Regions, excluding the AWS China (Beijing) Region and the AWS China (Ningxia) Region. Access Analyzer for S3 is also available through APIs in the AWS GovCloud (US) Regions.
To learn more, please read the blog post.
AWS Identity and Access Management (IAM) Access Analyzer is a new feature that makes it simple for security teams and administrators to check that their policies provide only the intended access to resources. Resource policies allow customers to granularly control who is able to access a specific resource and how they are able to use it across the entire cloud environment. With one click in the IAM console, customers can enable IAM Access Analyzer across their account to continuously analyze permissions granted using policies associated with their Amazon S3 buckets, AWS KMS keys, Amazon SQS queues, AWS IAM roles, and AWS Lambda functions.
IAM Access Analyzer continuously monitors policies for changes, meaning customers no longer need to rely on intermittent manual checks in order to catch issues as policies are added or updated. Using IAM Access Analyzer, customers can proactively address any resource policies that violate their security and governance best practices around resource sharing and protect their resources from unintended access. IAM Access Analyzer delivers comprehensive, detailed findings through the AWS IAM, Amazon S3, and AWS Security Hub consoles and also through its APIs. Findings can also be exported as a report for auditing purposes. IAM Access Analyzer findings provide definitive answers of who has public and cross-account access to AWS resources from outside an account.
IAM Access Analyzer uses a form of mathematical analysis called automated reasoning, which applies logic and mathematical inference to determine all possible access paths allowed by a resource policy. This means that IAM Access Analyzer can evaluate hundreds or even thousands of policies across a customer's environment in seconds, and deliver comprehensive findings about resources that are accessible from outside the account. Amazon calls this provable security.
With this launch, IAM Access Analyzer is available at no additional cost in the IAM console and through APIs in all commercial AWS Regions. IAM Access Analyzer is also available through APIs in AWS GovCloud (US).
To learn more about IAM Access Analyzer, see the feature page.