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Configure Kerberos encryption types.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-21954 | 3.154 | SV-25277r1_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 7 Security Technical Implementation Guide | 2013-07-03 |
Details
| Check Text ( C-26839r1_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 |