Title

IPSec Exemptions are limited. (Cat III impact)

Discussion

This check verifies that Windows is configured to limit IPSec exemptions.

Check Content

Analyze the system using the Security Configuration and Analysis snap-in. Expand the Security Configuration and Analysis tree view. Navigate to Local Policies -> Security Options. If the value for “MSS: (NoDefaultExempt) Configure IPSec exemptions for various types of network traffic” is not set to “Only ISAKMP is exempt (recommended for Windows Server 2003)”, then 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: 3

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 “Only ISAKMP is exempt (recommended for Windows Server 2003)”.

Additional Identifiers

Rule ID: SV-16835r1_rule

Vulnerability ID: V-14232

Group Title: IPSec Exemptions

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.