IAM group inline policies

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Metadata

Id: a58d1a2d-4078-4b80-855b-84cc3f7f4540

Cloud Provider: AWS

Platform: CloudFormation

Severity: Medium

Category: Access Control

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Description

IAM groups should not contain inline policies because inline policies are tightly coupled to the group’s lifecycle and are harder to audit, review, and reuse. This increases risk of accidental loss of permissions and inconsistent access control when groups are modified or deleted.

In CloudFormation, check AWS::IAM::Group resources and ensure the Properties.Policies attribute is undefined or empty. Use reusable managed policies instead by specifying ManagedPolicyArns or creating AWS::IAM::ManagedPolicy resources and referencing them. Resources with a non-empty Policies list will be flagged as a security risk.

Secure configuration example (attach managed policies rather than inline policies):

MyGroup:
  Type: AWS::IAM::Group
  Properties:
    GroupName: Devs
    ManagedPolicyArns:
      - arn:aws:iam::aws:policy/ReadOnlyAccess

Compliant Code Examples

AWSTemplateFormatVersion: "2010-09-09"
Description: A sample template
Resources:
    myuser:
      Type: AWS::IAM::Group

{
  "Description": "A sample template",
  "Resources": {
    "myuser": {
      "Type": "AWS::IAM::Group"
    }
  },
  "AWSTemplateFormatVersion": "2010-09-09"
}

Non-Compliant Code Examples

{
  "AWSTemplateFormatVersion": "2010-09-09",
  "Description": "A sample template",
  "Resources": {
    "myuser": {
      "Type": "AWS::IAM::Group",
      "Properties": {
        "Path": "/",
        "LoginProfile": {
          "Password": "myP@ssW0rd"
        },
        "Policies": [
          {
            "PolicyName": "giveaccesstoqueueonly",
            "PolicyDocument": {
              "Version": "2012-10-17",
              "Statement": [
                {
                  "Effect": "Allow",
                  "Action": [
                    "sqs:*"
                  ],
                  "Resource": [
                    "myqueue.Arn"
                  ]
                },
                {
                  "Effect": "Deny",
                  "Action": [
                    "sqs:*"
                  ],
                  "NotResource": [
                    "myqueue.Arn"
                  ]
                }
              ]
            }
          }
        ]
      }
    }
  }
}

AWSTemplateFormatVersion: "2010-09-09"
Description: A sample template
Resources:
    myuser:
      Type: AWS::IAM::Group
      Properties:
        Path: "/"
        LoginProfile:
          Password: myP@ssW0rd
        Policies:
        - PolicyName: giveaccesstoqueueonly
          PolicyDocument:
            Version: '2012-10-17'
            Statement:
            - Effect: Allow
              Action:
              - sqs:*
              Resource:
              - !GetAtt myqueue.Arn
            - Effect: Deny
              Action:
              - sqs:*
              NotResource:
              - !GetAtt myqueue.Arn