Microsoft Windows 11

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

STIG ID: WN11-SO-000190 | SRG: SRG-OS-000120-GPOS-00061 | Severity: Medium | CCI: CCI-000803 | Vulnerability ID: V-253460

Description

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

C-56913r829462_chk

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

Fix

F-56863r829463_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_SHA1AES256_HMAC_SHA1Future encryption types