Cis Azure Foundations 5.2.8

Ensure a Token Protection Conditional Access policy is considered

Description

This recommendation ensures that issued tokens are only issued to the intended device.

Rationale

When properly configured, conditional access can aid in preventing attacks involving token theft, via hijacking or reply, as part of the attack flow. Although currently considered a rare event, the impact from token impersonation can be severe.

Impact

A Microsoft Entra ID P1 or P2 license is required.

Start with a Conditional Access policy in "Report Only" mode prior to enforcing for all users.

Audit Procedure

Using Azure Portal

1. Sign in to the Microsoft Entra admin center as at least a Conditional Access Administrator.
2. Browse to Protection > Conditional Access > Policies.
3. Review existing policies to ensure that at least one policy contains the following configuration:
4. Under Assignments, review Users or workload identities and
   • Under Include, ensure the scope of the users or groups is appropriate for your organization.
   • Under Exclude, ensure only necessary users and groups (your organization's emergency access or break-glass accounts) are excepted.
5. Under Target resources > Resources > Include > Select resources: Ensure that both Office 365 Exchange Online and Office 365 SharePoint Online are selected.
6. Under Conditions > Device Platforms: Ensure Configure is set to Yes and Include indicates Windows platforms.
7. Under Conditions > Client Apps: Ensure Configure is set to Yes and Mobile Apps and Desktop Clients is selected under Modern Authentication Clients.
8. Under Access controls > Session, ensure that Require token protection for sign-in sessions is selected.

Expected Result

At least one Conditional Access policy should exist with Token Protection configured, targeting Office 365 Exchange Online and SharePoint Online on Windows platforms with mobile apps and desktop clients.

Remediation

Remediate from Azure Portal

1. Sign in to the Microsoft Entra admin center as at least a Conditional Access Administrator.
2. Browse to Protection > Conditional Access > Policies.
3. Select New policy.
4. Give your policy a name.
5. Under Assignments, select Users or workload identities.
   1. Under Include, select the users or groups to apply this policy.
   2. Under Exclude, select Users and groups and choose your organization's emergency access or break-glass accounts (if applicable).
6. Under Target resources > Resources > Include > Select resources
   1. Under Select, select the following applications:
      1. Office 365 Exchange Online
      2. Office 365 SharePoint Online
   2. Choose Select.
7. Under Conditions:
   1. Under Device platforms
      1. Set Configure to Yes.
      2. Include > Select device platforms > Windows.
      3. Select Done.
   2. Under Client apps:
      1. Set Configure to Yes.
      2. Under Modern authentication clients, only select Mobile apps and desktop clients.
      3. Select Done.
8. Under Access controls > Session, select Require token protection for sign-in sessions and select Select.
9. Confirm your settings and set Enable policy to On.
10. Select Create to enable your policy.

Default Value

A Token Protection Conditional Access policy does not exist by default.

References

1. https://learn.microsoft.com/en-us/entra/identity/conditional-access/concept-token-protection
2. https://www.microsoft.com/en-gb/security/business/microsoft-entra-pricing

CIS Controls

Profile

Level 2 | Manual