Policy CSP - ADMX_sam
Tip
This CSP contains ADMX-backed policies which require a special SyncML format to enable or disable. You must specify the data type in the SyncML as <Format>chr</Format>. For details, see Understanding ADMX-backed policies.
The payload of the SyncML must be XML-encoded; for this XML encoding, there are a variety of online encoders that you can use. To avoid encoding the payload, you can use CDATA if your MDM supports it. For more information, see CDATA Sections.
SamNGCKeyROCAValidation
| Scope | Editions | Applicable OS |
|---|---|---|
| ✅ Device ❌ User |
✅ Pro ✅ Enterprise ✅ Education ✅ Windows SE ✅ IoT Enterprise / IoT Enterprise LTSC |
✅ Windows 10, version 2004 with KB5005101 [10.0.19041.1202] and later ✅ Windows 10, version 20H2 with KB5005101 [10.0.19042.1202] and later ✅ Windows 10, version 21H1 with KB5005101 [10.0.19043.1202] and later ✅ Windows 11, version 21H2 [10.0.22000] and later |
./Device/Vendor/MSFT/Policy/Config/ADMX_sam/SamNGCKeyROCAValidation
This policy setting allows you to configure how domain controllers handle Windows Hello for Business (WHfB) keys that are vulnerable to the "Return of Coppersmith's attack" (ROCA) vulnerability.
For more information on the ROCA vulnerability, please see:
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-15361
https://en.wikipedia.org/wiki/ROCA_vulnerability
If you enable this policy setting the following options are supported:
Ignore: during authentication the domain controller won't probe any WHfB keys for the ROCA vulnerability.
Audit: during authentication the domain controller will emit audit events for WHfB keys that are subject to the ROCA vulnerability (authentications will still succeed).
Block: during authentication the domain controller will block the use of WHfB keys that are subject to the ROCA vulnerability (authentications will fail).
This setting only takes effect on domain controllers.
If not configured, domain controllers will default to using their local configuration. The default local configuration is Audit.
A reboot isn't required for changes to this setting to take effect.
Note to avoid unexpected disruptions this setting shouldn't be set to Block until appropriate mitigations have been performed, for example patching of vulnerable TPMs.
More information is available at< https://go.microsoft.com/fwlink/?linkid=2116430>.
Description framework properties:
| Property name | Property value |
|---|---|
| Format | chr (string) |
| Access Type | Add, Delete, Get, Replace |
Tip
This is an ADMX-backed policy and requires SyncML format for configuration. For an example of SyncML format, refer to Enabling a policy.
ADMX mapping:
| Name | Value |
|---|---|
| Name | SamNGCKeyROCAValidation |
| Friendly Name | Configure validation of ROCA-vulnerable WHfB keys during authentication |
| Location | Computer Configuration |
| Path | System > Security Account Manager |
| Registry Key Name | Software\Microsoft\Windows\CurrentVersion\Policies\System\SAM |
| ADMX File Name | sam.admx |