Compliance  oval:gov.nist.fdcc.xpfirewall:def:5111
Prohibit unicast response to multicast or broadcast requests - Standard Profile  

The Windows Firewall: Prohibit unicast response to multicast or broadcast requests setting prevents a computer from receiving unicast responses to its outgoing multicast or broadcast messages. When this policy setting is enabled and the computer sends multicast or broadcast messages to other computers, Windows Firewall blocks the unicast responses sent by those other computers. When the setting is disabled and this computer sends a multicast or broadcast message to other computers, Windows Firewall waits up to three seconds for unicast responses from the other computers and then blocks all later responses. Typically, you would not want to receive unicast responses to multicast or broadcast messages. Such responses can indicate a denial of service (DoS) attack or an attacker attempting to probe a known live computer. This appendix recommends you configure this policy setting to Enabled to help prevent this type of attack. Note: This policy setting has no effect if the unicast message is a response to a Dynamic Host Configuration Protocol (DHCP) broadcast message sent by the computer. Windows Firewall always permits those DHCP unicast responses. However, this policy setting can interfere with the NetBIOS messages that detect name conflicts.
Create Date: 2007-06-26

Affected Platforms/Products

Platforms: windows (from OVAL definitions)
  • Microsoft Windows XP

References

  • CCE-632
  • CCE-3103-9

Criteria

The system is compliant
IF : All of the following are true
IF : SOFTWARE\Policies\Microsoft\WindowsFirewall\StandardProfile!DisableUnicastResponsesToMulticastBroadcast exists
Windows : Registry Test :  SOFTWARE\Policies\Microsoft\WindowsFirewall\StandardProfile!DisableUnicastResponsesToMulticastBroadcast exists 
At least one of the objects listed below must exist on the system (Existence check)
Windows : Registry Object 
HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\WindowsFirewall\StandardProfile : DisableUnicastResponsesToMulticastBroadcast
IF : SOFTWARE\Policies\Microsoft\WindowsFirewall\StandardProfile!DisableUnicastResponsesToMulticastBroadcast is set to the variable defined in the profile
Windows : Registry Test :  SOFTWARE\Policies\Microsoft\WindowsFirewall\StandardProfile!DisableUnicastResponsesToMulticastBroadcast is set to the variable defined in the profile 
At least one of the objects listed below must exist on the system (Existence check)
Windows : Registry Object 
HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\WindowsFirewall\StandardProfile : DisableUnicastResponsesToMulticastBroadcast
type (equals) reg_dword
value
External Variable:oval:gov.nist.fdcc.xpfirewall:var:51111 (Prohibit unicast response to multicast or broadcast requests - Standard Profile)
(equals) (datatype=int)
windows : registry_state 
IF : Any one of the following are true
Prerequisites (Extended Definitions)
Microsoft Windows XP (x86) SP2 is installed oval:org.mitre.oval:def:754
Microsoft Windows XP (x86) SP3 is installed oval:org.mitre.oval:def:5631

Quick Help

External Variables
External variables are values defined by your policies, requirements etc. You should choose the most suitable value for you
Other Help Topics
Data Types
What is an Object?
What is a State?
What is a Test?
Other Help Topics
Regular Expression Patterns
Some object or state definitions are defined as regular expression patterns, you should interpret the regexp pattern while evaluating them.

OVAL Definitions By Referenced Objects

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