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Excluding the 'Pre-Windows 2000 Compatible Access' group when counting users [message #151763]

Mon, 30 May 2022 15:09

dchege
Messages: 1
Registered: May 2022

A customer running MailEssentials in Remote Active Directory Mode is looking to improve security in their Active Directory setup by removing the service account used in the MailEssentials Remote AD settings from the BuiltIn "Pre-Windows 2000 Compatible Access" group. Microsoft recommends that there should be no members in the Pre-Windows 2000 Compatible Access group.
However, this action results in the LDAP query used by MailEssentials to count users returning twice the number of licensed users, implying that the service account used in the MailEssentials Remote AD settings must be added to the Pre-Windows 2000 Compatible Access Active Directory group, thereby exposing the customers to a known vulnerability as documented in these articles:
https://www.lares.com/blog/detection-and-mitigation-advice-f or-printnightmare
https://www.semperis.com/blog/security-risks-pre-windows-200 0-compatibility-windows-2022/
Can you urgently tweak the MaiEssentials user count query so that it provides the correct count even if the queried user is not in the "Pre-Windows 2000 Compatible Access" group?

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Excluding the 'Pre-Windows 2000 Compatible Access' group when counting users

By: dchege on Mon, 30 May 2022 15:09

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