Firewall Security Requirements Guide
Rules, Groups, and Values defined within the XCCDF Benchmark
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SRG-NET-000019
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SRG-NET-000019
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The firewall must immediately use updates made to policy enforcement mechanisms such as firewall rules, security policies, and security zones.
Information flow policies regarding dynamic information flow control include, for example, allowing or disallowing information flows based on changes to the Ports, Protocols, Services Management [P...Rule Medium Severity -
SRG-NET-000061
Group -
SRG-NET-000074
Group -
SRG-NET-000075
Group -
The firewall must generate traffic log entries containing information to establish when (date and time) the events occurred.
Without establishing when events occurred, it is impossible to establish, correlate, and investigate the events leading up to an outage or attack. In order to compile an accurate risk assessment, ...Rule Medium Severity -
SRG-NET-000076
Group -
The firewall must generate traffic log entries containing information to establish the location on the network where the events occurred.
Without establishing where events occurred, it is impossible to establish, correlate, and investigate the events leading up to an outage or attack. In order to compile an accurate risk assessment ...Rule Medium Severity -
SRG-NET-000077
Group -
The firewall must generate traffic log entries containing information to establish the source of the events, such as the source IP address at a minimum.
Without establishing the source of the event, it is impossible to establish, correlate, and investigate the events leading up to an outage or attack. In order to compile an accurate risk assessment...Rule Low Severity -
SRG-NET-000078
Group -
The firewall must generate traffic log entries containing information to establish the outcome of the events, such as, at a minimum, the success or failure of the application of the firewall rule.
Without information about the outcome of events, security personnel cannot make an accurate assessment as to whether an attack was successful or if changes were made to the security state of the ne...Rule Medium Severity -
SRG-NET-000098
Group -
The firewall must be configured to use TCP when sending log records to the central audit server.
If the default UDP protocol is used for communication between the hosts and devices to the Central Log Server, then log records that do not reach the log server are not detected as a data loss. The...Rule Medium Severity -
SRG-NET-000099
Group -
SRG-NET-000100
Group -
The firewall must protect the traffic log from unauthorized deletion of local log files and log records.
If audit data were to become compromised, forensic analysis and discovery of the true source of potentially malicious system activity would be impossible to achieve. To ensure the veracity of audi...Rule Medium Severity -
SRG-NET-000131
Group -
The firewall must disable or remove unnecessary network services and functions that are not used as part of its role in the architecture.
Network devices are capable of providing a wide variety of functions (capabilities or processes) and services. Some of these functions and services are installed and enabled by default. The organiz...Rule Medium Severity -
SRG-NET-000192
Group -
SRG-NET-000193
Group -
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
Group -
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 -
SRG-NET-000392
Group -
The firewall must generate an alert that can be forwarded to, at a minimum, the ISSO and ISSM when denial-of-service (DoS) incidents are detected.
Without an alert, security personnel may be unaware of major detection incidents that require immediate action, and this delay may result in the loss or compromise of information. The firewall gen...Rule Low Severity -
SRG-NET-000492
Group -
SRG-NET-000493
Group -
SRG-NET-000364
Group -
The firewall must be configured to inspect all inbound and outbound traffic at the application layer.
Application inspection enables the firewall to control traffic based on different parameters that exist within the packets such as enforcing application-specific message and field length. Inspectio...Rule Medium Severity -
SRG-NET-000364
Group -
The firewall must be configured to inspect all inbound and outbound IPv6 traffic for unknown or out-of-order extension headers.
IPv6 packets with unknown extension headers as well as out-of-order headers can create denial-of-service attacks for other networking components as well as host devices. IPv6 inspection can check c...Rule Medium Severity -
SRG-NET-000364
Group -
The firewall must be configured to restrict it from accepting outbound packets that contain an illegitimate address in the source address field via an egress filter or by enabling Unicast Reverse Path Forwarding (uRPF).
A compromised host in an enclave can be used by a malicious platform to launch cyberattacks on third parties. This is a common practice in "botnets", which are a collection of compromised computers...Rule Medium Severity
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