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Cis Azure Foundations 5.4

DevOps & Security
cis-azure-foundations-5.4

Cis Azure Foundations 5.4 is an Agent Skill for devops & security published in the CyberStrikeus/CyberStrike repository on GitHub: a SKILL.md instruction file an AI agent can load to do this task.

Ensure 'Restrict non-admin users from creating tenants' is set to 'Yes'

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Inspect the Agent Skill at https://github.com/CyberStrikeus/CyberStrike/blob/HEAD/.cyberstrike/skill/CIS_benchmarks/Cloud_Providers/Microsoft_Azure/CIS_Microsoft_Azure_Foundations_Benchmark_v5.0.0/cis-azure-foundations-5.4/SKILL.md and all supporting files. Report provenance, permissions, scripts, dependencies, and security risks. Propose an exact installation into .agents/skills/cis-azure-foundations-5-4, but wait for my approval before writing files or running scripts.

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Ensure 'Restrict non-admin users from creating tenants' is set to 'Yes'

Description

Require administrators or appropriately delegated users to create new tenants.

Rationale

It is recommended to only allow an administrator to create new tenants. This prevents users from creating new Microsoft Entra ID or Azure AD B2C tenants and ensures that only authorized users are able to do so.

Impact

Enforcing this setting will ensure that only authorized users are able to create new tenants.

Audit Procedure

Using Azure Portal

  1. From Azure Home select the Portal Menu
  2. Select Microsoft Entra ID
  3. Under Manage, select Users
  4. Under Manage, select User settings
  5. Ensure that Restrict non-admin users from creating tenants is set to Yes

Using PowerShell

Import-Module Microsoft.Graph.Identity.SignIns
Connect-MgGraph -Scopes 'Policy.ReadWrite.Authorization'
Get-MgPolicyAuthorizationPolicy | Select-Object -ExpandProperty DefaultUserRolePermissions | Format-List

Review the "DefaultUserRolePermissions" section of the output. Ensure that AllowedToCreateTenants is not True.

Expected Result

In the Azure Portal, Restrict non-admin users from creating tenants should be set to Yes. In PowerShell, AllowedToCreateTenants should be False.

Remediation

Using Azure Portal

  1. From Azure Home select the Portal Menu
  2. Select Microsoft Entra ID
  3. Under Manage, select Users
  4. Under Manage, select User settings
  5. Set Restrict non-admin users from creating tenants to Yes
  6. Click Save

Using PowerShell

Import-Module Microsoft.Graph.Identity.SignIns

Connect-MgGraph -Scopes 'Policy.ReadWrite.Authorization'

Select-MgProfile -Name beta

$params = @{
DefaultUserRolePermissions = @{
AllowedToCreateTenants = $false
}
}

Update-MgPolicyAuthorizationPolicy -AuthorizationPolicyId -BodyParameter $params

Default Value

By default, users can create tenants.

References

  1. https://learn.microsoft.com/en-us/entra/fundamentals/users-default-permissions
  2. https://learn.microsoft.com/en-us/entra/identity/role-based-access-control/permissions-reference#tenant-creator
  3. https://blog.admindroid.com/disable-users-creating-new-azure-ad-tenants-in-microsoft-365/

CIS Controls

Controls VersionControlIG 1IG 2IG 3
v86.8 Define and Maintain Role-Based Access Controlx
v714.6 Protect Information through Access Control Listsxxx

Profile

Level 1 | Automated