Detections
Analytics
RHEL-10-800270 - RHEL 10 must prevent Internet Protocol version 6 (IPv6) Internet Control Message Protocol (ICMP) redirect messages from being accepted.
Information
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://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_RHEL_10_V1R1_STIG.zip
Item Details
Audit Name: DISA Red Hat Enterprise Linux 10 STIG v1r1
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: 7222c21c5a4f5358bfdf7aa4c5a46112ea8d54280dcf41bb0462529d7c42ba10