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II - Mission Support Classified

Rules and Groups employed by this XCCDF Profile

  • SRG-NET-000061-FW-000001

    <GroupDescription></GroupDescription>
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  • The F5 BIG-IP appliance that filters traffic from the VPN access points must be configured with organization-defined filtering rules that apply to the monitoring of remote access traffic.

    &lt;VulnDiscussion&gt;Remote access devices (such as those providing remote access to network devices and information systems) that lack automated ...
    Rule Medium Severity
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  • SRG-NET-000019-FW-000003

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  • The F5 BIG-IP appliance must be configured to use filters that use packet headers and packet attributes, including source and destination IP addresses and ports, to prevent the flow of unauthorized or suspicious traffic between interconnected networks with different security policies, including perimeter firewalls and server VLANs.

    &lt;VulnDiscussion&gt;Blocking or restricting detected harmful or suspicious communications between interconnected networks enforces approved autho...
    Rule High Severity
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  • F5BI-FW-300005

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  • The F5 BIG-IP appliance must generate traffic log entries containing information to establish the details of the event, including success or failure of the application of the firewall rule.

    &lt;VulnDiscussion&gt;Without establishing what type of event occurred, it would be difficult to establish, correlate, and investigate the events l...
    Rule Medium Severity
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  • SRG-NET-000089-FW-000019

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  • In the event that communication with the central audit server is lost, the F5 BIG-IP appliance must continue to queue traffic log records locally.

    &lt;VulnDiscussion&gt;It is critical that when the network element is at risk of failing to process traffic logs as required, it takes action to mi...
    Rule Low Severity
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  • SRG-NET-000098-FW-000021

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  • The F5 BIG-IP appliance must be configured to use TCP when sending log records to the central audit server.

    &lt;VulnDiscussion&gt;If the default UDP protocol is used for communication between the hosts and devices to the central log server, then log recor...
    Rule Medium Severity
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  • SRG-NET-000364-FW-000042

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  • The F5 BIG-IP appliance must be configured to restrict itself 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).

    &lt;VulnDiscussion&gt;A compromised host in an enclave can be used by a malicious platform to launch cyber attacks on third parties. This is a comm...
    Rule Medium Severity
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  • SRG-NET-000362-FW-000028

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  • The F5 BIG-IP appliance 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.

    &lt;VulnDiscussion&gt;Not configuring a key boundary security protection device such as the firewall against commonly known attacks is an immediate...
    Rule High Severity
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  • SRG-NET-000202-FW-000039

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  • The F5 BIG-IP appliance 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-000392-FW-000042

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  • The F5 BIG-IP appliance must generate an alert that can be forwarded to, at a minimum, the information system security officer (ISSO) and information system security manager (ISSM) when denial-of-service (DoS) incidents are detected.

    &lt;VulnDiscussion&gt;Without an alert, security personnel may be unaware of major detection incidents that require immediate action, and this dela...
    Rule Low Severity
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  • SRG-NET-000364-FW-000040

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  • The F5 BIG-IP appliance must be configured to inspect all inbound and outbound traffic at the application layer.

    &lt;VulnDiscussion&gt;Application inspection enables the firewall to control traffic based on different parameters that exist within the packets su...
    Rule Medium Severity
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  • SRG-NET-000364-FW-000031

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  • The F5 BIG-IP appliance must be configured to filter inbound traffic on all external interfaces.

    &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-FW-000032

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  • The F5 BIG-IP appliance must be configured to filter outbound traffic on all internal interfaces.

    &lt;VulnDiscussion&gt;If outbound communications traffic is not filtered, hostile activity intended to harm other networks or packets from networks...
    Rule Medium Severity
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  • SRG-NET-000364-FW-000035

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  • The F5 BIG-IP appliance must be configured to block all outbound management traffic.

    &lt;VulnDiscussion&gt;The management network must still have its own subnet to enforce control and access boundaries provided by Layer 3 network no...
    Rule Medium Severity
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  • SRG-NET-000205-FW-000040

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  • The BIG-IP appliance perimeter firewall must be configured to filter traffic destined to the enclave in accordance with the specific traffic that is approved and registered in the Ports, Protocols, and Services Management (PPSM) Category Assurance List (CAL) and vulnerability assessments.

    &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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