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II - Mission Support Classified

Rules and Groups employed by this XCCDF Profile

  • SRG-OS-000027

    <GroupDescription></GroupDescription>
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  • The operating system must limit the number of concurrent sessions for each account to an organization-defined number of sessions.

    &lt;VulnDiscussion&gt;Limiting the number of allowed users and sessions per user can limit risks related to denial of service attacks. The organiza...
    Rule Low Severity
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  • SRG-OS-000480

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  • The system must disable directed broadcast packet forwarding.

    &lt;VulnDiscussion&gt;This parameter must be disabled to reduce the risk of denial of service attacks.&lt;/VulnDiscussion&gt;&lt;FalsePositives&gt;...
    Rule Low Severity
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  • SRG-OS-000480

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  • The system must not respond to ICMP timestamp requests.

    &lt;VulnDiscussion&gt;By accurately determining the system's clock state, an attacker can more effectively attack certain time-based pseudorandom n...
    Rule Low Severity
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  • SRG-OS-000480

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  • The system must not respond to ICMP broadcast timestamp requests.

    &lt;VulnDiscussion&gt;By accurately determining the system's clock state, an attacker can more effectively attack certain time-based pseudorandom n...
    Rule Low Severity
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  • SRG-OS-000480

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  • The system must not respond to ICMP broadcast netmask requests.

    &lt;VulnDiscussion&gt;By determining the netmasks of various computers in your network, an attacker can better map your subnet structure and infer ...
    Rule Low Severity
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  • SRG-OS-000480

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  • The system must not respond to broadcast ICMP echo requests.

    &lt;VulnDiscussion&gt;ICMP echo requests can be useful for reconnaissance of systems and for denial of service attacks.&lt;/VulnDiscussion&gt;&lt;F...
    Rule Medium Severity
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  • SRG-OS-000480

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  • The system must not respond to multicast echo requests.

    &lt;VulnDiscussion&gt;Multicast echo requests can be useful for reconnaissance of systems and for denial of service attacks.&lt;/VulnDiscussion&gt;...
    Rule Low Severity
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  • SRG-OS-000480

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  • The system must ignore ICMP redirect messages.

    &lt;VulnDiscussion&gt;Ignoring ICMP redirect messages reduces the likelihood of denial of service attacks.&lt;/VulnDiscussion&gt;&lt;FalsePositives...
    Rule Low Severity
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  • SRG-OS-000480

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  • The system must set strict multihoming.

    &lt;VulnDiscussion&gt;These settings control whether a packet arriving on a non-forwarding interface can be accepted for an IP address that is not ...
    Rule Medium Severity
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  • SRG-OS-000480

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  • The system must disable ICMP redirect messages.

    &lt;VulnDiscussion&gt;A malicious user can exploit the ability of the system to send ICMP redirects by continually sending packets to the system, f...
    Rule Low Severity
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  • SRG-OS-000480

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  • The system must disable TCP reverse IP source routing.

    &lt;VulnDiscussion&gt;If enabled, reverse IP source routing would allow an attacker to more easily complete a three-way TCP handshake and spoof new...
    Rule Low Severity
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  • SRG-OS-000480

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  • The system must set maximum number of half-open TCP connections to 4096.

    &lt;VulnDiscussion&gt;This setting controls how many half-open connections can exist for a TCP port. It is necessary to control the number of comp...
    Rule Medium Severity
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  • SRG-OS-000480

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  • The system must set maximum number of incoming connections to 1024.

    &lt;VulnDiscussion&gt;This setting controls the maximum number of incoming connections that can be accepted on a TCP port limiting exposure to deni...
    Rule Low Severity
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  • SRG-OS-000480

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  • The system must disable network routing unless required.

    &lt;VulnDiscussion&gt;The network routing daemon, in.routed, manages network routing tables. If enabled, it periodically supplies copies of the sys...
    Rule Medium Severity
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  • SRG-OS-000480

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  • The system must implement TCP Wrappers.

    &lt;VulnDiscussion&gt;TCP Wrappers is a host-based access control system that allows administrators to control who has access to various network se...
    Rule Low Severity
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  • SRG-OS-000480

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  • The boundary protection system (firewall) must be configured to deny network traffic by default and must allow network traffic by exception (i.e., deny all, permit by exception).

    &lt;VulnDiscussion&gt;A firewall that relies on a deny all, permit by exception strategy requires all traffic to have explicit permission before tr...
    Rule Medium Severity
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  • SRG-OS-000480

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  • The system must prevent local applications from generating source-routed packets.

    &lt;VulnDiscussion&gt;Source-routed packets allow the source of the packet to suggest that routers forward the packet along a different path than c...
    Rule Low Severity
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  • SRG-OS-000023

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  • The operating system must display the DoD approved system use notification message or banner before granting access to the system for general system logons.

    &lt;VulnDiscussion&gt;Warning messages inform users who are attempting to log in to the system of their legal status regarding the system and must ...
    Rule Low Severity
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  • SRG-OS-000023

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  • The operating system must display the DoD approved system use notification message or banner for SSH connections.

    &lt;VulnDiscussion&gt;Warning messages inform users who are attempting to log in to the system of their legal status regarding the system and must ...
    Rule Low Severity
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  • SRG-OS-000023

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  • The GNOME service must display the DoD approved system use notification message or banner before granting access to the system.

    &lt;VulnDiscussion&gt;Warning messages inform users who are attempting to log in to the system of their legal status regarding the system and must ...
    Rule Low Severity
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  • SRG-OS-000023

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  • The FTP service must display the DoD approved system use notification message or banner before granting access to the system.

    &lt;VulnDiscussion&gt;Warning messages inform users who are attempting to log in to the system of their legal status regarding the system and must ...
    Rule Low Severity
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  • SRG-OS-000126

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  • The operating system must terminate all sessions and network connections when non-local maintenance is completed.

    &lt;VulnDiscussion&gt;Non-local maintenance and diagnostic activities are those activities conducted by individuals communicating through a network...
    Rule Medium Severity
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  • SRG-OS-000480

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  • The operating system must prevent internal users from sending out packets which attempt to manipulate or spoof invalid IP addresses.

    &lt;VulnDiscussion&gt;Manipulation of IP addresses can allow untrusted systems to appear as trusted hosts, bypassing firewall and other security me...
    Rule Medium Severity
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  • SRG-OS-000481

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  • Wireless network adapters must be disabled.

    &lt;VulnDiscussion&gt;The use of wireless networking can introduce many different attack vectors into the organization’s network. Common attack vec...
    Rule Medium Severity
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  • SRG-OS-000481

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  • The operating system must use mechanisms for authentication to a cryptographic module meeting the requirements of applicable federal laws, Executive orders, directives, policies, regulations, standards, and guidance for such authentication.

    &lt;VulnDiscussion&gt;Encryption is only as good as the encryption modules utilized. Unapproved cryptographic module algorithms cannot be verified,...
    Rule Medium Severity
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