Details

Encryption is only as good as the encryption modules utilized. Unapproved cryptographic module algorithms cannot be verified and cannot be relied on to provide confidentiality or integrity, and DoD data may be compromised due to weak algorithms. The use of TLS provides confidentiality of data in transit between the application server and client. FIPS 140-2 approved TLS versions include TLS V1.0 or greater.

TLS must be enabled and non-FIPS-approved SSL versions must be disabled. NIST SP 800-52 specifies the preferred configurations for government systems.

Solution

Set the policy value for Computer Configuration >> Administrative Templates >> Microsoft Office 2016 (Machine) >> Security Settings >> IE Security ‘Consistent Mime Handling’ to ‘Enabled’ and select the check boxes for all installed Office programs.

Supportive Information

The following resource is also helpful.

• https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_MS_Office_365_ProPlus_V2R3_STIG.zip

This security hardening control applies to the following category of controls within NIST 800-53: Identification and Authentication.This control applies to the following type of system Windows.

References

• 800-53|IA-7
• CAT|II
• CCI|CCI-000803
• CSCv6|3.1
• Rule-ID|SV-223297r508019_rule
• STIG-ID|O365-CO-000015
• STIG-Legacy|SV-108773
• STIG-Legacy|V-99669
• Vuln-ID|V-223297

Source

• Tenable.com/audits