module
Microsoft Exchange Server DlpUtils AddTenantDlpPolicy RCE
Disclosed |
---|
Jan 12, 2021 |
Disclosed
Jan 12, 2021
Description
This vulnerability allows remote attackers to execute arbitrary code
on affected installations of Exchange Server. Authentication is
required to exploit this vulnerability. Additionally, the target user
must have the "Data Loss Prevention" role assigned and an active
mailbox.
If the user is in the "Compliance Management" or greater "Organization
Management" role groups, then they have the "Data Loss Prevention"
role. Since the user who installed Exchange is in the "Organization
Management" role group, they transitively have the "Data Loss
Prevention" role.
The specific flaw exists within the processing of the New-DlpPolicy
cmdlet. The issue results from the lack of proper validation of
user-supplied template data when creating a DLP policy. An attacker
can leverage this vulnerability to execute code in the context of
SYSTEM.
Tested against Exchange Server 2016 CU19 on Windows Server 2016.
on affected installations of Exchange Server. Authentication is
required to exploit this vulnerability. Additionally, the target user
must have the "Data Loss Prevention" role assigned and an active
mailbox.
If the user is in the "Compliance Management" or greater "Organization
Management" role groups, then they have the "Data Loss Prevention"
role. Since the user who installed Exchange is in the "Organization
Management" role group, they transitively have the "Data Loss
Prevention" role.
The specific flaw exists within the processing of the New-DlpPolicy
cmdlet. The issue results from the lack of proper validation of
user-supplied template data when creating a DLP policy. An attacker
can leverage this vulnerability to execute code in the context of
SYSTEM.
Tested against Exchange Server 2016 CU19 on Windows Server 2016.

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