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

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-21954	3.154	SV-32706r1_rule	ECSC-1	Medium

Description
This setting configures a minimum encryption type for Kerberos preventing the use of the DES encryption suites.

STIG	Date
Windows Server 2008 R2 Domain Controller Security Technical Implementation Guide	2013-10-01

Details

Check Text ( C-32914r1_chk )

Analyze the system using the Security Configuration and Analysis snap-in. 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, then 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: \Sofware\Microsoft\Windows\CurrentVersion\Policies\System\Kerberos\Parameters\ Value Name: SupportedEncryptionTypes Type: REG_DWORD Value: 0x7ffffffc (2147483644)

Fix Text (F-22943r1_fix)
Configure the policy value for “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