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RHEL-10-800230 RHEL 10 must ignore IPv6 Internet Control Message Protocol (ICMP) redirect messages.

DISA STIG library V1R3
All changes in this version
first version loaded CAT II

Maps to SC-5 via CCI-002385, CCI-001110

Title

RHEL 10 must ignore IPv6 Internet Control Message Protocol (ICMP) redirect messages.

Control

Note: If IPv6 is disabled on the system, this requirement is not applicable. Verify RHEL 10 ignores IPv6 ICMP redirect messages. Check the value of the "net.ipv6.conf.all.accept_redirects" variable with the following command: $ sysctl net.ipv6.conf.all.accept_redirects net.ipv6.conf.all.accept_redirects = 0 If "net.ipv6.conf.all.accept_redirects" is not set to "0" or is missing, this is a finding.

Discussion

An illicit ICMP redirect message could result in a man-in-the-middle attack. Satisfies: SRG-OS-000420-GPOS-00186, SRG-OS-000142-GPOS-00086

Related controls

CCI-001110, CCI-002385

Fix

Configure RHEL 10 to ignore Internet Protocol version 6 (IPv6) ICMP redirect messages. 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.all.accept_redirects = 0 Reload settings from all system configuration files with the following command: $ sudo sysctl --system