The use of DES encryption suites must not be allowed for Kerberos encryption.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-21954	WN12-SO-000064	SV-53179r2_rule		Medium

Description
Certain encryption types are no longer considered secure. By default, Windows 2012/R2 does not use the DES encryption suites. If the configuration of allowed Kerberos encryption suites is needed, the DES encryption suites must not be included.

STIG	Date
Windows Server 2012 / 2012 R2 Member Server Security Technical Implementation Guide	2016-07-22

Details

Check Text ( None )
None

Fix Text (F-66513r3_fix)
The default system configuration does not use DES encryption for Kerberos and supports this requirement. If Kerberos encryption types must be configured, ensure the following are not selected: DES_CBC_CRC DES_CBC_MD5 If the policy for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "Network security: Configure encryption types allowed for Kerberos" is configured, only the following selections are allowed: RC4_HMAC_MD5 AES128_HMAC_SHA1 AES256_HMAC_SHA1 Future encryption types

Fix Text (F-66513r3_fix)

The default system configuration does not use DES encryption for Kerberos and supports this requirement. If Kerberos encryption types must be configured, ensure the following are not selected:

DES_CBC_CRC
DES_CBC_MD5

If the policy for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "Network security: Configure encryption types allowed for Kerberos" is configured, only the following selections are allowed:

RC4_HMAC_MD5
AES128_HMAC_SHA1
AES256_HMAC_SHA1
Future encryption types