Restrict nonadministrator users from recovering the BitLocker keys for their owned devices

Maester checks this too

CIS.M365.5.1.4.6 (Ensure users are restricted from recovering BitLocker keys) checks the same setting. Running both reports it twice.

Overview

When non-administrator users can access their own BitLocker keys, threat actors who compromise user credentials can gain direct access to encryption keys without requiring privilege escalation. Once attackers obtain BitLocker keys, they can decrypt sensitive data stored on the device, including cached credentials, local databases, and confidential files.

Without proper restrictions, a single compromised user account provides immediate access to all encrypted data on that device, negating the primary security benefit of disk encryption and creating a pathway for lateral movement.

Remediation

• Restrict non-admin users from recovering the BitLocker key(s) for their owned devices

Run it

The check runs as part of the whole assessment, with the ZeroTrustAssessment module installed:

Install-Module ZeroTrustAssessment -Scope CurrentUser
Connect-Maester
Invoke-Maester -Pack ZTA -SkipBuiltIn

Leave out -SkipBuiltIn to run Maester’s own checks in the same run.

About this check

Severity	Low
Effort to fix	Low
Impact on users	Low
Pillar	Identity
Category	Access control
Product	Entra ID
Feature	Device identity
Area	Access control
ATT&CK	T1552 Unsecured Credentials
Licence	Free
Tenant	Workforce, External

Product, feature, area and ATT&CK are Maester’s: the assessment does not record them, so Maester keeps them in the pack’s taxonomy.json.

A Microsoft check, part of the Zero Trust Assessment pack. Text from ZeroTrustAssessment 3.1.0, © Microsoft, MIT licence.