IPSec Exemptions must be limited.

From Windows 8/8.1 Security Technical Implementation Guide

Associated with IA controls: ECSC-1

Associated with: CCI-000366

SV-48171r2_rule IPSec Exemptions must be limited.

Vulnerability discussion

IPSec exemption filters allow specific traffic that may be needed by the system for such things as Kerberos authentication. This setting configures Windows for specific IPSec exemptions.

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. (See "Updating the Windows Security Options File" in the STIG Overview document if MSS settings are not visible in the system's policy tools.) If the value for "MSS: (NoDefaultExempt) Configure IPSec exemptions for various types of network traffic" is not set to "Multicast, broadcast and ISAKMP exempt (best for Windows XP)", this is a finding. The policy referenced configures the following registry value: Registry Hive: HKEY_LOCAL_MACHINE Registry Path: \System\CurrentControlSet\Services\IPSEC\ Value Name: NoDefaultExempt Value Type: REG_DWORD Value: 1

Fix text

Configure the policy value for Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> Security Options -> "MSS: (NoDefaultExempt) Configure IPSec exemptions for various types of network traffic" to "Multicast, broadcast and ISAKMP exempt (best for Windows XP)".

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