Firewall Security Requirements Guide
Rules, Groups, and Values defined within the XCCDF Benchmark
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SRG-NET-000192
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SRG-NET-000193
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The firewall implementation must manage excess bandwidth to limit the effects of packet flooding types of denial-of-service (DoS) attacks.
A firewall experiencing a DoS attack will not be able to handle production traffic load. The high utilization and CPU caused by a DoS attack will also have an effect on control keep-alives and time...Rule Medium Severity -
SRG-NET-000202
Group -
SRG-NET-000205
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The perimeter firewall must filter traffic destined to the internal enclave in accordance with the specific traffic that is approved and registered in the Ports, Protocols, and Services Management (PPSM) Category Assurance List (CAL), Vulnerability Assessments (VAs) for that the enclave.
The enclave's internal network contains the servers where mission-critical data and applications reside. Malicious traffic can enter from an external boundary or originate from a compromised host i...Rule Medium Severity -
SRG-NET-000235
Group -
SRG-NET-000236
Group -
SRG-NET-000333
Group -
SRG-NET-000335
Group -
If communication with the central audit server is lost, the firewall must generate a real-time alert to, at a minimum, the SCA and ISSO.
Without a real-time alert (less than a second), security personnel may be unaware of an impending failure of the audit functions and system operation may be adversely impacted. Alerts provide organ...Rule Medium Severity -
SRG-NET-000362
Group -
The firewall must employ filters that prevent or limit the effects of all types of commonly known denial-of-service (DoS) attacks, including flooding, packet sweeps, and unauthorized port scanning.
Not configuring a key boundary security protection device such as the firewall against commonly known attacks is an immediate threat to the protected enclave because they are easily implemented by ...Rule High Severity -
SRG-NET-000364
Group -
The firewall must apply ingress filters to traffic that is inbound to the network through any active external interface.
Unrestricted traffic to the trusted networks may contain malicious traffic that poses a threat to an enclave or to other connected networks. Additionally, unrestricted traffic may transit a network...Rule Medium Severity -
SRG-NET-000364
Group -
SRG-NET-000364
Group -
The premise firewall (located behind the premise router) must block all outbound management traffic.
The management network must still have its own subnet in order to enforce control and access boundaries provided by Layer 3 network nodes such as routers and firewalls. Management traffic between t...Rule Medium Severity -
SRG-NET-000364
Group -
The firewall must restrict traffic entering the VPN tunnels to the management network to only the authorized management packets based on destination address.
Protect the management network with a filtering firewall configured to block unauthorized traffic. This requirement is similar to the out-of-band management (OOBM) model, when the production networ...Rule Medium Severity
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