Define AWS Assume Role

An AWS user may temporarily assume the rights of another IAM role to carry out a particular job thanks to the security feature known as AWS Assume Role. When an IAM user wants to access resources that need higher-level rights but only has access to restricted resources, this is especially helpful.

By using the AWS Security Token Service (STS) AssumeRole API action, a role may be assumed. The ARN (Amazon Resource Name) of the role to assume is specified when you call this operation, and STS responds with a set of temporary security credentials that includes an access key, a secret access key, and a session token.

  • Once the permissions have been granted, you may use these temporary security credentials to conduct AWS API requests accorded to the acted-out position. The user reverts to their initial permissions after the temporary security credentials expire.
  • In AWS settings, the AWS Assume Role function is essential for assuring security and compliance. It is frequently utilized in situations involving cross-account access, federated access, and resource sharing.
  • Access to AWS resources may be granted across accounts using AWS Assume Role. You may use AWS Assume Role to provide the required permissions, for instance, if an application that is operating in one AWS account wants to access resources in another AWS account.
  • Additionally, federated users who have been verified by an outside identity provider (IdP), such as a corporate Active Directory or a SAML-based identity provider, can be given temporary access via AWS Assume Role.
  • You must have an IAM user or an IAM role with the authority to assume the target role to utilize AWS Assume Role. To do this, it is customary to create a policy that authorizes the "sts:AssumeRole" permission.
  • An optional "external ID" that may be used to increase process security. The target role can be set to only permit the request if the external ID matches a specified value. This is a distinctive identifier that is supplied along with the AssumeRole request.
  • Additionally, "role chaining" situations, in which one position may assume another, which in turn can assume still another role, can be made using AWS Identity and Access Management (IAM). When many levels of authorization are needed in complicated contexts, this can be advantageous.

You can use the AWS Management Console, the AWS CLI, or one of the AWS SDKs to utilize AWS Assume Role. The precise procedure for taking on a position will be determined by the tool you're use.


AWS Assume Role is a strong security tool that enables you to temporarily offer access to AWS resources while exercising rigorous control over permissions and security.

Access to resources located inside the same AWS account can also be granted using AWS Assume Role. For instance, you might not want to grant all users access to a role with enhanced rights that grants access to a particular S3 bucket. A user can momentarily gain access to the bucket with the required permissions by taking that role.

You can optionally include a "session name" when you take a role to offer more information about the assumed role session. As it makes it easier to determine who carried out the actions while adopting the position, this might be helpful for recording and auditing reasons.

The target account must expressly permit the assuming account to use AWS Assume Role in a cross-account situation by establishing a bond of trust between the two accounts, adopt the role.

In order to increase security and compliance monitoring capabilities, AWS Assume Role may be used in concert with other AWS security tools like AWS CloudTrail and AWS Config.

AWS offers a variety of security recommended practices, such as routinely rotating the credentials used to assume the role, setting up MFA for the assuming user, and utilizing AWS CloudTrail to monitor and report all role assumption activities, in order to avoid any exploitation or misuse of AWS Assume Role.

In order to facilitate the automation of role-taking, AWS also offers a variety of tools and services. For example, AWS Single Sign-On (SSO) gives users access to numerous AWS accounts and roles through a single interface along with AWS Security Token Service (STS) session policies, which let you provide granular permissions for particular role assumption situations.

Whether you're working within a single AWS account or across many accounts, AWS Assume Role is a strong security tool that may assist you in enforcing least privilege access and upholding strict control over permissions and security.