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RHEL-10-800260 RHEL 10 must not accept router advertisements on all Internet Protocol version 6 (IPv6) interfaces by default.

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

Maps to SC-5, SC-7(8) via CCI-002385, CCI-001113

Title

RHEL 10 must not accept router advertisements on all Internet Protocol version 6 (IPv6) interfaces by default.

Control

Note: If IPv6 is disabled on the system, this requirement is not applicable. Verify RHEL 10 does not accept router advertisements on all IPv6 interfaces by default, unless the system is a router. Check the value of the "net.ipv6.conf.default.accept_ra" variable with the following command: $ sudo sysctl net.ipv6.conf.default.accept_ra net.ipv6.conf.default.accept_ra = 0 If "net.ipv6.conf.default.accept_ra" is not set to "0" or is missing, this is a finding.

Discussion

An illicit router advertisement message could result in a man-in-the-middle attack. Satisfies: SRG-OS-000420-GPOS-00186, SRG-OS-000142-GPOS-00089

Related controls

CCI-001113, CCI-002385

Fix

Configure RHEL 10 to not accept router advertisements on all IPv6 interfaces by default, unless the system is a router. Create a configuration file if it does not already exist: $ sudo vi /etc/sysctl.d/ipv6_accept_ra.conf Add the following line to the file: net.ipv6.conf.default.accept_ra = 0 Reload settings from all system configuration files with the following command: $ sudo sysctl --system