Detections
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1.428 RHEL-10-800270

Information

RHEL 10 must prevent Internet Protocol version 6 (IPv6) Internet Control Message Protocol (ICMP) redirect messages from being accepted.

GROUP ID: V-281359
RULE ID: SV-281359r1167227

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.

Satisfies: SRG-OS-000420-GPOS-00186, SRG-OS-000142-GPOS-00090

Solution

Configure RHEL 10 to prevent IPv6 ICMP redirect messages from being accepted.

Create a configuration file if it does not already exist:

$ sudo vi /etc/sysctl.d/ipv6_accept_redirects.conf

Add the following line to the file:

net.ipv6.conf.default.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-7(8), CAT|II, CCI|CCI-001114, CCI|CCI-002385, Rule-ID|SV-281359r1167227_rule, STIG-ID|RHEL-10-800270, Vuln-ID|V-281359

Plugin: Unix

Control ID: 3f3f7249bbc2bca9eeff649f0b4cbe358c1810f7594cd38c7274c0a1b53c6fea