II - Mission Support Classified
Rules and Groups employed by this XCCDF Profile
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NET0180
Group -
All global address ranges used on unclassified and classified networks must be properly registered with the DoD Network Information Center (NIC).
If network address space is not properly configured, managed, and controlled, the network could be accessed by unauthorized personnel resulting in security compromise of site information and resour...Rule Medium Severity -
NET0185
Group -
Network Address Translation (NAT) and private IP address space must not be deployed within the SIPRNet enclave.
The DoD has an enterprise level security-focused configuration management (SecCM) requirement to support end-to-end monitoring of SIPRNet, as a National Security System (NSS). The use of NAT and pr...Rule Medium Severity -
NET0198
Group -
Dynamic Host Configuration Protocol (DHCP) audit and event logs must record sufficient forensic data to be stored online for thirty days and offline for one year.
In order to identify and combat IP address spoofing, it is highly recommended that the DHCP server logs MAC addresses and hostnames on the DHCP server, in addition to standard data such as IP addre...Rule Medium Severity -
NET0199
Group -
Dynamic Host Configuration Protocol (DHCP) servers used within SIPRNet infrastructure must be configured with a minimum lease duration time of 30 days.
In order to trace, audit, and investigate suspicious activity, DHCP servers within the SIPRNet infrastructure must have the minimum lease duration time configured to 30 or more days.Rule Low Severity -
NET0210
Group -
All network infrastructure devices must be located in a secure room with limited access.
If all communications devices are not installed within controlled access areas, risk of unauthorized access and equipment failure exists, which could result in denial of service or security comprom...Rule Medium Severity -
NET0346
Group -
All hosted NIPRNet-only applications must be located in a local enclave Demilitarized Zone (DMZ).
Without the protection of a DMZ, production networks will be prone to outside attacks as they are allowing externally accessible services to be accessed on the internal LAN. This can cause many un...Rule Medium Severity -
NET0348
Group -
All Internet-facing applications must be hosted in a DoD Demilitarized Zone (DMZ) Extension.
Without the protection of a DMZ, production networks will be prone to outside attacks as they are allowing externally accessible services to be accessed on the internal LAN. This can cause many un...Rule Medium Severity -
NET0351
Group -
When protecting the boundaries of a network, the firewall must be placed between the private network and the perimeter router and the Demilitarized Zone (DMZ).
The only way to mediate the flow of traffic between the inside network, the outside connection, and the DMZ is to place the firewall into the architecture in a manner that allows the firewall the a...Rule Medium Severity -
NET0365
Group -
The organization must implement a deep packet inspection solution when protecting perimeter boundaries.
Deep packet inspection (DPI) examines the packet beyond the Layer 4 header by examining the payload to identify the application or service. DPI searches for illegal statements, predefined criteria,...Rule High Severity -
NET0369
Group -
A deny-by-default security posture must be implemented for traffic entering and leaving the enclave.
To prevent malicious or accidental leakage of traffic, organizations must implement a deny-by-default security posture at the network perimeter. Such rulesets prevent many malicious exploits or ac...Rule High Severity -
NET0445
Group -
Two-factor authentication must be implemented to restrict access to all network elements.
Without secure management implemented with authenticated access controls, strong two-factor authentication, encryption of the management session and audit logs, unauthorized users may gain access t...Rule Medium Severity -
NET0810
Group -
Two Network Time Protocol (NTP) servers must be deployed in the management network.
NTP provides an efficient and scalable method for managed network elements to actively synchronize to an accurate time source. Insuring that there are always NTP servers available to provide time i...Rule Low Severity -
NET0928
Group -
A policy must be implemented to keep Bogon/Martian rulesets up to date.
A Bogon route or Martian address is a type of packet that should never be routed inbound through the perimeter device. Bogon routes and Martian addresses are commonly found as the source addresses...Rule Medium Severity -
NET0998
Group -
A dedicated management network must be implemented.
To deploy a management network for the purpose of controlling, monitoring, and restricting management traffic, a separate management subnet must be implemented. Define a large enough address block ...Rule Medium Severity -
NET1025
Group -
A minimum of two syslog servers must be deployed in the management network.
Maintaining an audit trail of system activity logs can help identify configuration errors, understand past intrusions, troubleshoot service disruptions, and react to probes and scans of the network.Rule Low Severity -
NET1026
Group -
Syslog messages must be retained for a minimum of 30 days online and then stored offline for one year.
Logging is a critical part of router security. Maintaining an audit trail of system activity logs (syslog) can help identify configuration errors, understand past intrusions, troubleshoot service ...Rule Low Severity -
NET1040
Group -
Current and previous network element configurations must be stored in a secured location.
If the network element's non-volatile memory is lost without a recent configuration stored in an offline location, it may take time to recover that segment of the network. Users connected directly...Rule Low Severity -
NET1050
Group -
The organization must encrypt all network device configurations while stored offline.
If a network device's non-volatile memory is lost without a recent configuration stored in an offline location, it may take time to recover that segment of the network. Users connected directly to...Rule Medium Severity -
NET1622
Group -
An Out-of-Band (OOB) management network must be deployed or 24x7 personnel must have console access for device management.
From an architectural point of view, providing Out-Of-Band (OOB) management of network systems is the best first step in any management strategy. No production traffic resides on an out-of-band net...Rule Medium Severity -
NET1815
Group -
All Releasable Local Area Network (REL LAN) environments must be documented in the System Security Authorization Agreement (SSAA).
The ISSM will ensure Releasable Local Area Network (REL LAN) environments are documented in the SSAA.Rule Medium Severity -
NET1816
Group -
Annual reviews must be performed on all Releasable Local Area Network (REL LAN) environments.
The ISSM will ensure Releasable Local Area Network (REL LAN) reviews are performed annually.Rule Medium Severity -
NET1826
Group -
Enabling a connection that extends DISN IP network connectivity (e.g., NIPRNet and SIPRNet) to any DoD Vendor, Foreign, or Federal Mission Partner enclave or network without a signed DoD CIO approved sponsorship memo is prohibited. For classified connectivity it must be to a DSS approved contractor facility or DoD Component approved foreign government facility.
Having a circuit provisioned that connects the SIPRNet enclave to a non-DoD, foreign, or contractor network puts the enclave and the entire SIPRNet at risk. If the termination point is not operated...Rule High Severity -
NET1827
Group -
Command and Control (C2) and non-C2 exceptions of SIPRNet must be documented in the enclaves accreditation package and an Authority to Connect (ATC) or Interim ATC amending the connection approval received prior to implementation.
Any exception to use SIPRNet must be documented in an update to the enclave's accreditation package and an Authority to Connect (ATC) or Interim ATC amending the connection approval received prior...Rule Medium Severity -
NET1832
Group -
VPN gateways used to create IP tunnels to transport classified traffic across an unclassified IP network must comply with appropriate physical security protection standards for processing classified information.
When transporting classified data over an unclassified IP network, it is imperative that the network elements deployed to provision the encrypted tunnels are located in a facility authorized to pro...Rule Medium Severity -
NET2000
Group -
Multi-Protocol Labeled Switching (MPLS) protocols deployed to build Label-Switch Path (LSP) tunnels must authenticate all messages with a hash function using the most secured cryptographic algorithm available.
Spoofed TCP segments could be introduced into the connection streams for LDP sessions used to build LSPs. By configuring strict authentication between LSR peers, LDP TCP sessions can be restricted ...Rule Medium Severity
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