III - Administrative Classified
Rules and Groups employed by this XCCDF Profile
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SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
RHEL 9 must log IPv4 packets with impossible addresses by default.
<VulnDiscussion>The presence of "martian" packets (which have impossible addresses) as well as spoofed packets, source-routed packets, and re...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
RHEL 9 must use reverse path filtering on all IPv4 interfaces.
<VulnDiscussion>Enabling reverse path filtering drops packets with source addresses that should not have been able to be received on the inte...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
RHEL 9 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 -
RHEL 9 must not forward IPv4 source-routed packets by default.
<VulnDiscussion>Source-routed packets allow the source of the packet to suggest routers forward the packet along a different path than config...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
RHEL 9 must use a reverse-path filter for IPv4 network traffic when possible by default.
<VulnDiscussion>Enabling reverse path filtering drops packets with source addresses that should not have been able to be received on the inte...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
RHEL 9 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. Ignoring ...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
RHEL 9 must limit the number of bogus Internet Control Message Protocol (ICMP) response errors logs.
<VulnDiscussion>Some routers will send responses to broadcast frames that violate RFC-1122, which fills up a log file system with many useles...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
RHEL 9 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 -
RHEL 9 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 -
RHEL 9 must not enable IPv4 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 c...Rule Medium Severity
Node 2
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