Guests have restricted access to directory objects

Overview

External user accounts are often used to provide access to business partners who belong to organizations that have a business relationship with your enterprise. If these accounts are compromised in their organization, attackers can use the valid credentials to gain initial access to your environment, often bypassing traditional defenses due to their legitimacy.

External accounts with permissions to read directory object permissions provide attackers with broader initial access if compromised. These accounts allow attackers to gather additional information from the directory for reconnaissance.

Remediation

• Restrict guest access to their own directory objects

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	Medium
Effort to fix	Low
Impact on users	Medium
Pillar	Identity
Category	External collaboration
Product	Entra ID
Feature	External identities
Area	External access and sharing
ATT&CK	T1087.004 Cloud Account, T1069.003 Cloud Groups
Licence	Free
Tenant	Workforce

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.