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Kerberos encryption types must be configured to prevent the use of DES and RC4 encryption suites.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-73685 | WN16-SO-000350 | SV-88349r1_rule | Medium |
| Description |
|---|
| Certain encryption types are no longer considered secure. The DES and RC4 encryption suites must not be used for Kerberos encryption. |
| STIG | Date |
|---|---|
| Windows Server 2016 Security Technical Implementation Guide | 2017-11-20 |
Details
| Check Text ( C-73767r1_chk ) |
|---|
| 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 (F-80135r1_fix) |
|---|
| 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 |