II - Mission Support Public
Rules and Groups employed by this XCCDF Profile
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SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
OL 8 must disable the systemd Ctrl-Alt-Delete burst key sequence.
<VulnDiscussion>A locally logged-on user who presses Ctrl-Alt-Delete when at the console can reboot the system. If accidentally pressed, as c...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
OL 8 must disable the debug-shell systemd service.
<VulnDiscussion>The debug-shell requires no authentication and provides root privileges to anyone who has physical access to the machine. Whi...Rule Low Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
The Trivial File Transfer Protocol (TFTP) server package must not be installed if not required for OL 8 operational support.
<VulnDiscussion>If TFTP is required for operational support (such as the transmission of router configurations) its use must be documented wi...Rule High Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
The root account must be the only account having unrestricted access to the OL 8 system.
<VulnDiscussion>If an account other than root also has a User Identifier (UID) of "0", it has root authority, giving that account unrestricte...Rule High Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
OL 8 must prevent IPv4 Internet Control Message Protocol (ICMP) redirect messages from being accepted.
<VulnDiscussion>ICMP redirect messages are used by routers to inform hosts that a more direct route exists for a particular destination. Thes...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
OL 8 must prevent IPv6 Internet Control Message Protocol (ICMP) redirect messages from being accepted.
<VulnDiscussion>ICMP redirect messages are used by routers to inform hosts that a more direct route exists for a particular destination. Thes...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
OL 8 must not send Internet Control Message Protocol (ICMP) redirects.
<VulnDiscussion>ICMP redirect messages are used by routers to inform hosts that a more direct route exists for a particular destination. Thes...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
OL 8 must not respond to Internet Control Message Protocol (ICMP) echoes sent to a broadcast address.
<VulnDiscussion>Responding to broadcast ICMP echoes facilitates network mapping and provides a vector for amplification attacks. There are...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
OL 8 must not forward IPv4 source-routed packets.
<VulnDiscussion>Source-routed packets allow the source of the packet to suggest that routers forward the packet along a different path than c...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
OL 8 must not forward IPv6 source-routed packets.
<VulnDiscussion>Source-routed packets allow the source of the packet to suggest that routers forward the packet along a different path than c...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
OL 8 must not forward IPv4 source-routed packets by default.
<VulnDiscussion>Source-routed packets allow the source of the packet to suggest that routers forward the packet along a different path than c...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
OL 8 must not forward IPv6 source-routed packets by default.
<VulnDiscussion>Source-routed packets allow the source of the packet to suggest that routers forward the packet along a different path than c...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
OL 8 must not enable IPv6 packet forwarding unless the system is a router.
<VulnDiscussion>Routing protocol daemons are typically used on routers to exchange network topology information with other routers. If this s...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
OL 8 must not accept router advertisements on all IPv6 interfaces.
<VulnDiscussion>Routing protocol daemons are typically used on routers to exchange network topology information with other routers. If this s...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
OL 8 must not accept router advertisements on all IPv6 interfaces by default.
<VulnDiscussion>Routing protocol daemons are typically used on routers to exchange network topology information with other routers. If this s...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
OL 8 must not allow interfaces to perform Internet Control Message Protocol (ICMP) redirects by default.
<VulnDiscussion>ICMP redirect messages are used by routers to inform hosts that a more direct route exists for a particular destination. Thes...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
OL 8 must ignore IPv4 Internet Control Message Protocol (ICMP) redirect messages.
<VulnDiscussion>ICMP redirect messages are used by routers to inform hosts that a more direct route exists for a particular destination. Thes...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
OL 8 must ignore IPv6 Internet Control Message Protocol (ICMP) redirect messages.
<VulnDiscussion>ICMP redirect messages are used by routers to inform hosts that a more direct route exists for a particular destination. Thes...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
OL 8 must disable access to the network "bpf" syscall from unprivileged processes.
<VulnDiscussion>It is detrimental for operating systems to provide, or install by default, functionality exceeding requirements or mission ob...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
OL 8 must restrict the use of "ptrace" to descendant processes.
<VulnDiscussion>It is detrimental for operating systems to provide, or install by default, functionality exceeding requirements or mission ob...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
OL 8 must restrict exposed kernel pointer addresses access.
<VulnDiscussion>It is detrimental for operating systems to provide, or install by default, functionality exceeding requirements or mission ob...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
OL 8 must disable the use of user namespaces.
<VulnDiscussion>It is detrimental for operating systems to provide, or install by default, functionality exceeding requirements or mission ob...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
OL 8 must use reverse path filtering on all IPv4 interfaces.
<VulnDiscussion>It is detrimental for operating systems to provide, or install by default, functionality exceeding requirements or mission ob...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
OL 8 must enable hardening for the Berkeley Packet Filter Just-in-time compiler.
<VulnDiscussion>It is detrimental for operating systems to provide, or install by default, functionality exceeding requirements or mission ob...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
OL 8 must be configured to prevent unrestricted mail relaying.
<VulnDiscussion>If unrestricted mail relaying is permitted, unauthorized senders could use this host as a mail relay to send spam or for othe...Rule Medium Severity
Node 2
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