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


Overview

Finding ID Version Rule ID IA Controls Severity
V-21954 WN08-SO-000064 SV-48426r1_rule ECSC-1 Medium
Description
Certain encryption types are no longer considered secure. This setting configures a minimum encryption type for Kerberos, preventing the use of the DES encryption suites.
STIG Date
Windows 8 Security Technical Implementation Guide 2014-01-07

Details

Check Text ( C-45094r2_chk )
Analyze the system using the Security Configuration and Analysis snap-in. (See "Performing Analysis with the Security Configuration and Analysis Snap-in" in the STIG Overview document.)
Expand the Security Configuration and Analysis tree view.
Navigate to Local Policies -> Security Options.

If the value for "Network Security: Configure encryption types allowed for Kerberos" is not set to "Enabled" with only the following selected, this is a finding:

RC4_HMAC_MD5
AES128_HMAC_SHA1
AES256_HMAC_SHA1
Future encryption types

(If DES_CBC_CRC and DES_CBC_MD5 are selected, this is a finding)

The policy referenced configures the following registry value:

Registry Hive: HKEY_LOCAL_MACHINE
Subkey: \Software\Microsoft\Windows\CurrentVersion\Policies\System\Kerberos\Parameters\

Value Name: SupportedEncryptionTypes

Type: REG_DWORD
Value: 0x7ffffffc (2147483644)
Fix Text (F-41557r2_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:

RC4_HMAC_MD5
AES128_HMAC_SHA1
AES256_HMAC_SHA1
Future encryption types