Outgoing secure channel traffic must be encrypted when possible.

From Windows 8/8.1 Security Technical Implementation Guide

Part of Encryption of Secure Channel Traffic

SV-48055r1_rule Outgoing secure channel traffic must be encrypted when possible.

Vulnerability discussion

Requests sent on the secure channel are authenticated, and sensitive information (such as passwords) is encrypted, but not all information is encrypted. If this policy is enabled, outgoing secure channel traffic will be encrypted.

Check content

Analyze the system using the Security Configuration and Analysis snap-in. (See "Performing Analysis with the Security Configuration and Analysis Snap-in" in the STIG Overview document.) Expand the Security Configuration and Analysis tree view. Navigate to Local Policies -> Security Options. If the value for "Domain Member: Digitally encrypt secure channel data (when possible)" is not set to "Enabled", this is a finding. The policy referenced configures the following registry value: Registry Hive: HKEY_LOCAL_MACHINE Registry Path: \System\CurrentControlSet\Services\Netlogon\Parameters\ Value Name: SealSecureChannel Value Type: REG_DWORD Value: 1 Note: If the value for "Domain Member: Digitally encrypt or sign secure channel data (always)" is set to "Enabled", this would not be a finding.

Fix text

Configure the policy value for Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> Security Options -> "Domain Member: Digitally encrypt secure channel data (when possible)" to "Enabled".

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