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II - Mission Support Classified

Rules and Groups employed by this XCCDF Profile

  • SRG-OS-000480-GPOS-00227

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  • The Photon operating system must configure Secure Shell (SSH) to perform strict mode checking of home directory configuration files.

    &lt;VulnDiscussion&gt;If other users have access to modify user-specific SSH configuration files, they may be able to log on to the system as anoth...
    Rule Medium Severity
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  • SRG-OS-000480-GPOS-00227

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  • The Photon operating system must configure Secure Shell (SSH) to disallow Kerberos authentication.

    &lt;VulnDiscussion&gt;If Kerberos is enabled through SSH, sshd provides a means of access to the system's Kerberos implementation. Vulnerabilities ...
    Rule Medium Severity
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  • SRG-OS-000480-GPOS-00227

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  • The Photon operating system must configure Secure Shell (SSH) to disallow compression of the encrypted session stream.

    &lt;VulnDiscussion&gt;If compression is allowed in an SSH connection prior to authentication, vulnerabilities in the compression software could res...
    Rule Medium Severity
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  • SRG-OS-000480-GPOS-00227

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  • The Photon operating system must configure Secure Shell (SSH) to display the last login immediately after authentication.

    &lt;VulnDiscussion&gt;Providing users with feedback on the last time they logged on via SSH facilitates user recognition and reporting of unauthori...
    Rule Medium Severity
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  • SRG-OS-000480-GPOS-00227

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  • The Photon operating system must configure Secure Shell (SSH) to ignore user-specific trusted hosts lists.

    &lt;VulnDiscussion&gt;SSH trust relationships enable trivial lateral spread after a host compromise and therefore must be explicitly disabled. Indi...
    Rule Medium Severity
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  • SRG-OS-000480-GPOS-00227

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  • The Photon operating system must configure Secure Shell (SSH) to ignore user-specific known_host files.

    &lt;VulnDiscussion&gt;SSH trust relationships enable trivial lateral spread after a host compromise and therefore must be explicitly disabled. Indi...
    Rule Medium Severity
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  • SRG-OS-000480-GPOS-00227

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  • The Photon operating system must configure Secure Shell (SSH) to limit the number of allowed login attempts per connection.

    &lt;VulnDiscussion&gt;By setting the login attempt limit to a low value, an attacker will be forced to reconnect frequently, which severely limits ...
    Rule Medium Severity
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  • SRG-OS-000480-GPOS-00227

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  • The Photon operating system must configure Secure Shell (SSH) to restrict AllowTcpForwarding.

    &lt;VulnDiscussion&gt;While enabling TCP tunnels is a valuable function of sshd, this feature is not appropriate for use on single purpose applianc...
    Rule Medium Severity
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  • SRG-OS-000480-GPOS-00227

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  • The Photon operating system must configure Secure Shell (SSH) to restrict LoginGraceTime.

    &lt;VulnDiscussion&gt;By default, SSH unauthenticated connections are left open for two minutes before being closed. This setting is too permissive...
    Rule Medium Severity
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  • SRG-OS-000480-GPOS-00227

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  • The Photon operating system must be configured so that the x86 Ctrl-Alt-Delete key sequence is disabled on the command line.

    &lt;VulnDiscussion&gt;When the Ctrl-Alt-Del target is enabled, a locally logged-on user who presses Ctrl-Alt-Delete, when at the console, can reboo...
    Rule Medium Severity
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  • SRG-OS-000480-GPOS-00227

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  • The Photon operating system must not forward IPv4 or IPv6 source-routed packets.

    &lt;VulnDiscussion&gt;Source routing is an Internet Protocol mechanism that allows an IP packet to carry information, a list of addresses, that tel...
    Rule Medium Severity
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  • SRG-OS-000480-GPOS-00227

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  • The Photon operating system must not respond to IPv4 Internet Control Message Protocol (ICMP) echoes sent to a broadcast address.

    &lt;VulnDiscussion&gt;Responding to broadcast (ICMP) echoes facilitates network mapping and provides a vector for amplification attacks.&lt;/VulnDi...
    Rule Medium Severity
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  • SRG-OS-000480-GPOS-00227

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  • The Photon operating system must prevent IPv4 Internet Control Message Protocol (ICMP) redirect messages from being accepted.

    &lt;VulnDiscussion&gt;ICMP redirect messages are used by routers to inform hosts that a more direct route exists for a particular destination. Thes...
    Rule Medium Severity
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  • SRG-OS-000480-GPOS-00227

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  • The Photon operating system must prevent IPv4 Internet Control Message Protocol (ICMP) secure redirect messages from being accepted.

    &lt;VulnDiscussion&gt;ICMP redirect messages are used by routers to inform hosts that a more direct route exists for a particular destination. Thes...
    Rule Medium Severity
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  • SRG-OS-000480-GPOS-00227

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  • The Photon operating system must not send IPv4 Internet Control Message Protocol (ICMP) redirects.

    &lt;VulnDiscussion&gt;ICMP redirect messages are used by routers to inform hosts that a more direct route exists for a particular destination. Thes...
    Rule Medium Severity
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  • SRG-OS-000480-GPOS-00227

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  • The Photon operating system must log IPv4 packets with impossible addresses.

    &lt;VulnDiscussion&gt;The presence of "martian" packets (which have impossible addresses) as well as spoofed packets, source-routed packets, and re...
    Rule Medium Severity
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  • SRG-OS-000480-GPOS-00227

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  • The Photon operating system must use a reverse-path filter for IPv4 network traffic.

    &lt;VulnDiscussion&gt;Enabling reverse path filtering drops packets with source addresses that should not have been able to be received on the inte...
    Rule Medium Severity
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  • SRG-OS-000480-GPOS-00227

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  • The Photon operating system must not perform IPv4 packet forwarding.

    &lt;VulnDiscussion&gt;Routing protocol daemons are typically used on routers to exchange network topology information with other routers. If this s...
    Rule Medium Severity
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  • SRG-OS-000480-GPOS-00227

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  • The Photon operating system must send TCP timestamps.

    &lt;VulnDiscussion&gt;TCP timestamps are used to provide protection against wrapped sequence numbers. It is possible to calculate system uptime (an...
    Rule Medium Severity
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  • SRG-OS-000480-GPOS-00227

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  • The Photon operating system must be configured to protect the Secure Shell (SSH) public host key from unauthorized modification.

    &lt;VulnDiscussion&gt;If a public host key file is modified by an unauthorized user, the SSH service may be compromised.&lt;/VulnDiscussion&gt;&lt;...
    Rule Medium Severity
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  • SRG-OS-000480-GPOS-00227

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  • The Photon operating system must be configured to protect the Secure Shell (SSH) private host key from unauthorized access.

    &lt;VulnDiscussion&gt;If an unauthorized user obtains the private SSH host key file, the host could be impersonated.&lt;/VulnDiscussion&gt;&lt;Fals...
    Rule Medium Severity
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  • SRG-OS-000480-GPOS-00227

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  • The Photon operating system must enforce password complexity on the root account.

    &lt;VulnDiscussion&gt;Password complexity rules must apply to all accounts on the system, including root. Without specifying the enforce_for_root f...
    Rule Medium Severity
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  • SRG-OS-000480-GPOS-00227

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  • The Photon operating system must disable systemd fallback DNS.

    &lt;VulnDiscussion&gt;Systemd contains an ability to set fallback DNS servers, which is used for DNS lookups in the event no system level DNS serve...
    Rule Medium Severity
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  • SRG-OS-000480-GPOS-00227

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  • The Photon operating system must generate audit records for all access and modifications to the opasswd file.

    &lt;VulnDiscussion&gt;Without the capability to generate audit records, it would be difficult to establish, correlate, and investigate the events r...
    Rule Medium Severity
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  • SRG-OS-000250-GPOS-00093

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  • The Photon operating system must implement only approved Message Authentication Codes (MACs) to protect the integrity of remote access sessions.

    &lt;VulnDiscussion&gt;Without cryptographic integrity protections, information can be altered by unauthorized users without detection. Remote acce...
    Rule High Severity
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