Detections
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2.3.6.1 (L1) Ensure 'Domain member: Digitally encrypt or sign secure channel data (always)' is set to 'Enabled'

Information

This policy setting determines whether all secure channel traffic that is initiated by the domain member must be signed or encrypted.
The recommended state for this setting is: Enabled.

Rationale:
When a computer joins a domain, a computer account is created. After it joins the domain, the computer uses the password for that account to create a secure channel with the Domain Controller for its domain every time that it restarts. Requests that are sent on the secure channel are authenticated?and sensitive information such as passwords are encrypted?but the channel is not integrity-checked, and not all information is encrypted.
Digital encryption and signing of the secure channel is a good idea where it is supported. The secure channel protects domain credentials as they are sent to the Domain Controller.

Solution

To establish the recommended configuration via GP, set the following UI path to Enabled:
Computer Configuration\Policies\Windows Settings\Security Settings\Local Policies\Security Options\Domain member: Digitally encrypt or sign secure channel data (always)

Impact:
None - this is the default behavior. However, only Windows NT 4.0 with Service Pack 6a (SP6a) and subsequent versions of the Windows operating system support digital encryption and signing of the secure channel. Windows 98 Second Edition clients do not support it unless they have Dsclient installed. Therefore, you cannot enable the Domain member: Digitally encrypt or sign secure channel data (always) setting on Domain Controllers that support Windows 98 clients as members of the domain. Potential impacts can include the following:
- The ability to create or delete trust relationships with clients running versions of Windows earlier than Windows NT 4.0 with SP6a will be disabled.
- Logons from clients running versions of Windows earlier than Windows NT 4.0 with SP6a will be disabled.
- The ability to authenticate other domains' users from a Domain Controller running a version of Windows earlier than Windows NT 4.0 with SP6a in a trusted domain will be disabled.
You can enable this policy setting after you eliminate all Windows 9x clients from the domain and upgrade all Windows NT 4.0 servers and Domain Controllers from trusted/trusting domains to Windows NT 4.0 with SP6a.

Default Value:
Enabled. (All secure channel data must be signed or encrypted.)

References:
1. CCE-34892-0

See Also

https://workbench.cisecurity.org/benchmarks/14249

Item Details

Category: SECURITY ASSESSMENT AND AUTHORIZATION

References: 800-53|CA-7, CSCv6|13, CSCv7|13.3

Plugin: Windows

Control ID: 494ab2d68beb4ea906d8a1152a9ca264025294712bba0955ed07e50bb09fa8ee