Detections
Analytics

1.410 RHEL-10-800090

Information

RHEL 10 must ignore Internet Protocol version 4 (IPv4) Internet Control Message Protocol (ICMP) redirect messages.

GROUP ID: V-281341
RULE ID: SV-281341r1167173

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 illicit ICMP redirect message could result in a man-in-the-middle attack.

This feature of the IPv4 protocol has few legitimate uses. It should be disabled unless absolutely required.

Satisfies: SRG-OS-000420-GPOS-00186, SRG-OS-000142-GPOS-00072

Solution

Configure RHEL 10 to ignore IPv4 ICMP redirect messages.

Create a configuration file if it does not already exist:

$ sudo vi /etc/sysctl.d/99-ipv4_accept_redirects.conf

Add the following line to the file:

net.ipv4.conf.all.accept_redirects = 0

Reload settings from all system configuration files with the following command:

$ sudo sysctl --system

See Also

https://workbench.cisecurity.org/benchmarks/26403

Item Details

Category: SYSTEM AND COMMUNICATIONS PROTECTION

References: 800-53|SC-5, 800-53|SC-6, CAT|II, CCI|CCI-001096, CCI|CCI-002385, Rule-ID|SV-281341r1167173_rule, STIG-ID|RHEL-10-800090, Vuln-ID|V-281341

Plugin: Unix

Control ID: ff2a2033567e8496188503b60c912c7e7050eb237e57ae7685a9fdb8a470ecff