Detections
Analytics
DTOO264 - Send all signed messages as clear signed messages must be configured.
Information
This policy setting controls whether Outlook sends signed messages as clear text signed messages. If you enable this policy setting, the 'Send clear text signed message when sending signed messages' option is selected in the E-mail Security section of the Trust Center. If you disable or do not configure this policy setting, when users sign e-mail messages with their digital signature and send them, Outlook uses the signature's private key to encrypt the digital signature but sends the messages as clear text, unless they are encrypted separately.Solution
Set the policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2016 -> Security -> Cryptography 'Send all signed messages as clear signed messages' to 'Enabled'.See Also
http://iasecontent.disa.mil/stigs/zip/U_MS_Outlook_2016_V1R2_STIG.zip
Item Details
Audit Name: DISA STIG Microsoft Outlook 2016 v1r2
Category: SYSTEM AND COMMUNICATIONS PROTECTION
References: 800-53|SC-8(1), CAT|II, CCI|CCI-000366, Rule-ID|SV-85855r1_rule, STIG-ID|DTOO264, Vuln-ID|V-71231
Plugin: Windows
Control ID: 32a45552f3b42f9b5bbd4cf055ed5bcbee5abb8809f468fe886c94d3d95567cb