Control: 1.9 Ensure IAM password policy prevents password reuse

Description

IAM password policies can prevent the reuse of a given password by the same user. It is recommended that the password policy prevent the reuse of passwords.

Preventing password reuse increases account resiliency against brute force login attempts.

Remediation

Perform the following to set the password policy as prescribed:

From Console:

Login to AWS Console (with appropriate permissions to View Identity Access Management Account Settings).
Go to IAM Service on the AWS Console.
Click on Account Settings on the Left Pane.
Check "Prevent password reuse".
Set "Number of passwords to remember" is set to 24.

From Command Line:

aws iam update-account-password-policy --password-reuse-prevention 24

Note: All commands starting with "aws iam update-account-password-policy" can be combined into a single command.

Usage

Run the control in your terminal:

powerpipe control run aws_compliance.control.cis_v200_1_9

Snapshot and share results via Turbot Pipes:

powerpipe login
powerpipe control run aws_compliance.control.cis_v200_1_9 --share

SQL

This control uses a named query:

select
  'arn:' || a.partition || ':::' || a.account_id as resource,
  case
    when password_reuse_prevention >= 24 then 'ok'
    else 'alarm'
  end as status,
  case
    when minimum_password_length is null then 'No password policy set.'
    when password_reuse_prevention is null then 'Password reuse prevention not set.'
    else 'Password reuse prevention set to ' || password_reuse_prevention || '.'
  end as reason
  , a.account_id
from
  aws_account as a
  left join aws_iam_account_password_policy as pol on a.account_id = pol.account_id;