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Firewall Security Requirements Guide

Rules, Groups, and Values defined within the XCCDF Benchmark

  • SRG-NET-000100

    <GroupDescription></GroupDescription>
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  • The firewall must protect the traffic log from unauthorized deletion of local log files and log records.

    &lt;VulnDiscussion&gt;If audit data were to become compromised, forensic analysis and discovery of the true source of potentially malicious system ...
    Rule Medium Severity
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  • SRG-NET-000131

    <GroupDescription></GroupDescription>
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  • The firewall must disable or remove unnecessary network services and functions that are not used as part of its role in the architecture.

    &lt;VulnDiscussion&gt;Network devices are capable of providing a wide variety of functions (capabilities or processes) and services. Some of these ...
    Rule Medium Severity
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  • SRG-NET-000192

    <GroupDescription></GroupDescription>
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  • The firewall must block outbound traffic containing denial-of-service (DoS) attacks to protect against the use of internal information systems to launch any DoS attacks against other networks or endpoints.

    &lt;VulnDiscussion&gt;DoS attacks can take multiple forms but have the common objective of overloading or blocking a network or host to deny or ser...
    Rule Medium Severity
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  • SRG-NET-000193

    <GroupDescription></GroupDescription>
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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.

    &lt;VulnDiscussion&gt;A firewall experiencing a DoS attack will not be able to handle production traffic load. The high utilization and CPU caused ...
    Rule Medium Severity
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  • SRG-NET-000202

    <GroupDescription></GroupDescription>
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  • The firewall must deny network communications traffic by default and allow network communications traffic by exception (i.e., deny all, permit by exception).

    &lt;VulnDiscussion&gt;To prevent malicious or accidental leakage of traffic, organizations must implement a deny-by-default security posture at the...
    Rule High Severity
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  • SRG-NET-000205

    <GroupDescription></GroupDescription>
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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.

    &lt;VulnDiscussion&gt;The enclave's internal network contains the servers where mission-critical data and applications reside. Malicious traffic ca...
    Rule Medium Severity
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  • SRG-NET-000235

    <GroupDescription></GroupDescription>
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  • The firewall must fail to a secure state upon the failure of the following: system initialization, shutdown, or system abort.

    &lt;VulnDiscussion&gt;Failure to a known safe state helps prevent systems from failing to a state that may cause loss of data or unauthorized acces...
    Rule Medium Severity
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  • SRG-NET-000236

    <GroupDescription></GroupDescription>
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  • The firewall must apply ingress filters to traffic that is inbound to the network through any active external interface.

    &lt;VulnDiscussion&gt;Unrestricted traffic to the trusted networks may contain malicious traffic that poses a threat to an enclave or to other conn...
    Rule Medium Severity
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  • SRG-NET-000364

    <GroupDescription></GroupDescription>
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  • In the event of a system failure of the firewall function, the firewall must be configured to save diagnostic information, log system messages, and load the most current security policies, rules, and signatures when restarted.

    &lt;VulnDiscussion&gt;Failure to a secure state can address safety or security in accordance with the mission needs of the organization. Failure to...
    Rule Medium Severity
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  • SRG-NET-000333

    <GroupDescription></GroupDescription>
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  • The firewall must be configured to send traffic log entries to a central audit server for management and configuration of the traffic log entries.

    &lt;VulnDiscussion&gt;Without the ability to centrally manage the content captured in the traffic log entries, identification, troubleshooting, and...
    Rule Medium Severity
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