II - Mission Support Public
Rules and Groups employed by this XCCDF Profile
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SRG-OS-000480-GPOS-00227
Group -
The Photon operating system must configure Secure Shell (SSH) to ignore user-specific known_host files.
SSH trust relationships enable trivial lateral spread after a host compromise and therefore must be explicitly disabled. Individual users can have a local list of trusted remote machines, which mus...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
Group -
The Photon operating system must configure Secure Shell (SSH) to limit the number of allowed login attempts per connection.
By setting the login attempt limit to a low value, an attacker will be forced to reconnect frequently, which severely limits the speed and effectiveness of brute-force attacks.Rule Medium Severity -
SRG-OS-000480-GPOS-00227
Group -
The Photon operating system must configure Secure Shell (SSH) to restrict AllowTcpForwarding.
While enabling TCP tunnels is a valuable function of sshd, this feature is not appropriate for use on single purpose appliances.Rule Medium Severity -
SRG-OS-000480-GPOS-00227
Group -
The Photon operating system must configure Secure Shell (SSH) to restrict LoginGraceTime.
By default, SSH unauthenticated connections are left open for two minutes before being closed. This setting is too permissive as no legitimate login would need such an amount of time to complete a ...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
Group -
The Photon operating system must be configured so that the x86 Ctrl-Alt-Delete key sequence is disabled on the command line.
When the Ctrl-Alt-Del target is enabled, a locally logged-on user who presses Ctrl-Alt-Delete, when at the console, can reboot the system. If accidentally pressed, as could happen in the case of a ...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
Group -
The Photon operating system must not forward IPv4 or IPv6 source-routed packets.
Source routing is an Internet Protocol mechanism that allows an IP packet to carry information, a list of addresses, that tells a router the path the packet must take. There is also an option to re...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
Group -
The Photon operating system must not respond to IPv4 Internet Control Message Protocol (ICMP) echoes sent to a broadcast address.
Responding to broadcast (ICMP) echoes facilitates network mapping and provides a vector for amplification attacks.Rule Medium Severity -
SRG-OS-000480-GPOS-00227
Group -
The Photon operating system must prevent IPv4 Internet Control Message Protocol (ICMP) redirect messages from being accepted.
ICMP redirect messages are used by routers to inform hosts that a more direct route exists for a particular destination. These messages modify the host's route table and are unauthenticated. An ill...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
Group -
The Photon operating system must prevent IPv4 Internet Control Message Protocol (ICMP) secure redirect messages from being accepted.
ICMP redirect messages are used by routers to inform hosts that a more direct route exists for a particular destination. These messages modify the host's route table and are unauthenticated. An ill...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
Group -
The Photon operating system must not send IPv4 Internet Control Message Protocol (ICMP) redirects.
ICMP redirect messages are used by routers to inform hosts that a more direct route exists for a particular destination. These messages contain information from the system's route table, possibly r...Rule Medium Severity
Node 2
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