Kerberos encryption types must be configured to prevent the use of DES and RC4 encryption suites.

From Windows Server 2016 Security Technical Implementation Guide

Associated with: CCI-000803

SV-88349r1_rule Kerberos encryption types must be configured to prevent the use of DES and RC4 encryption suites.

Vulnerability discussion

Certain encryption types are no longer considered secure. The DES and RC4 encryption suites must not be used for Kerberos encryption.

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

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