active directory group permissions report powershell

The issue with this is that EWS throttling could negatively impact applications like Outlook for Mac and doesn’t resolve the escalation path with Exchange permissions configured in AD. Microsoft recently published an article ( ) on how to configure EWS throttling which will mitigate the issue(s) that Dirk-jan Mollema raised. The Bloodhound tool written by Andy Robbins, Rohan Vazarkar, and Will can identify attack paths involving Exchange permissions configured in Active Directory. More information about this issue has been highlighted in presentations by Andy Robbins and Will including at Black Hat USA 2017. Some slides from this presentation are shown here as representative samples (the full presentation slide deck is in the Presentations section. Users or computers with this privilege can perform synchronization operations that are normally used by Domain Controllers to replicate, which allows attackers to synchronize all the hashed passwords of users in the Active Directory.Īt the Microsoft Blue Hat in 2017, Sean Metcalf, Trimarc founder and Active Directory Subject Matter Expert (SME) highlighted issues with Exchange permissions. The Exchange Windows Permissions group has WriteDacl access on the Domain object in Active Directory, which enables any member of this group to modify the domain privileges, among which is the privilege to perform DCSync operations. The main vulnerability here is that Exchange has high privileges in the Active Directory domain. * Exchange has a feature which makes it authenticate to an attacker with the computer account of the Exchange server * NTLM authentication is vulnerable to relay attacks * Exchange Servers have (too) high privileges by default There are 3 components which are combined to escalate from any user with a mailbox to Domain Admin access: This blog combines a few known vulnerabilities and known protocol weaknesses into a new attack.

He highlights the key components of the issue in the blog post introduction:

Tools have been released to take advantage of this issue. Recently a blog post was published by Dirk-jan Mollema titled “Abusing Exchange: One API call away from Domain Admin ” ( )which highlighted several issues with Exchange permissions and a chained attack which would likely result in a regular user with a mailbox being able to become a Domain Admin in the AD forest.

Active directory group permissions report powershell