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IPSec Exemptions must be limited.


Overview

Finding ID Version Rule ID IA Controls Severity
V-14232 WN12-SO-000042 SV-52945r1_rule Low
Description
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.
STIG Date
Windows Server 2012/2012 R2 Member Server Security Technical Implementation Guide 2020-06-16

Details

Check Text ( C-47251r2_chk )
If the following registry value does not exist or is not configured as specified, this is a finding:

Registry Hive: HKEY_LOCAL_MACHINE
Registry Path: \System\CurrentControlSet\Services\IPSEC\

Value Name: NoDefaultExempt

Value Type: REG_DWORD
Value: 3
Fix Text (F-45871r2_fix)
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 "Only ISAKMP is exempt (recommended for Windows Server 2003)".

(See "Updating the Windows Security Options File" in the STIG Overview document if MSS settings are not visible in the system's policy tools.)