AWS EC2 instance can update the trust policy for a role with administrative privileges
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Description
In AWS environments, some IAM permissions can lead to privilege escalation, where an identity can gain access to another more privileged identity. This rule identifies when an EC2 instance has an IAM role that can use iam:UpdateAssumeRolePolicy to modify an existing trust policy for an IAM role with administrative privileges. By modifying the role trust policy, an adversary could assume that role and leverage their privileges.
Rationale
The identity which triggered this detection can update the trust policy for a role with administrative privileges, giving them access to the privileges of that role.
Datadog recommends reducing the permissions attached to an EC2 instance to the minimum required for it to fulfill its function. To remediate the issue, either remove the iam:UpdateAssumeRolePolicy permission entirely or modify the resource specified in the IAM policy.
