STIGQter: STIG Summary: Microsoft Windows Server 2016 Security Technical Implementation Guide Version: 2 Release: 2 Benchmark Date: 04 May 2021:

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

DISA Rule

SV-225052r569186_rule

Vulnerability Number

V-225052

Group Title

SRG-OS-000120-GPOS-00061

Rule Version

WN16-SO-000350

Severity

CAT II

CCI(s)

CCI-000803 - The information system implements mechanisms for authentication to a cryptographic module that meet the requirements of applicable federal laws, Executive Orders, directives, policies, regulations, standards, and guidance for such authentication.

Weight

Fix Recommendation

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

Note: Organizations with domain controllers running earlier versions of Windows where RC4 encryption is enabled, selecting "The other domain supports Kerberos AES Encryption" on domain trusts, may be required to allow client communication across the trust relationship.

Check Contents

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)

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

DISA Rule

Vulnerability Number

Group Title

Rule Version

Severity

CCI(s)

Weight

Fix Recommendation

Check Contents

Vulnerability Number

Documentable

Rule Version

Severity Override Guidance

Check Content Reference

Target Key

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