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Check: WN10-SO-000190

Microsoft Windows 10 STIG: WN10-SO-000190 (in versions v3 r2 through v1 r7)

Title

Kerberos encryption types must be configured to prevent the use of DES and RC4 encryption suites. (Cat II impact)

Discussion

Certain encryption types are no longer considered secure. This setting configures a minimum encryption type for Kerberos, preventing the use of the DES and RC4 encryption suites.

Check Content

If the following registry value does not exist or is not configured as specified, this is a finding: Registry Hive: HKEY_LOCAL_MACHINE Registry Path: \SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\Kerberos\Parameters\ Value Name: SupportedEncryptionTypes Value Type: REG_DWORD Value: 0x7ffffff8 (2147483640)

Fix Text

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "Network security: Configure encryption types allowed for Kerberos" to "Enabled" with only the following selected: AES128_HMAC_SHA1 AES256_HMAC_SHA1 Future encryption types

Additional Identifiers

Rule ID: SV-220936r971535_rule

Vulnerability ID: V-220936

Group Title: SRG-OS-000120-GPOS-00061

Expert Comments

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CCIs

CCIs tied to check.

Number	Definition
CCI-000803	Implement mechanisms for authentication to a cryptographic module that meet the requirements of applicable laws, Executive Orders, directives, policies, regulations, standards, and guidance for such authentication.

Controls

Controls tied to check. These are derived from the CCIs shown above.

Number	Title
IA-7	Cryptographic Module Authentication