Detections
Analytics

1.443 OL09-00-006045

Information

OL 9 must prevent IPv6 Internet Control Message Protocol (ICMP) redirect messages from being accepted.

GROUP ID: V-271882
RULE ID: SV-271882r1092358

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.

Solution

Configure OL 9 to prevent IPv6 ICMP redirect messages from being accepted.

Add or edit the following line in a single system configuration file in the "/etc/sysctl.d/" directory:

net.ipv6.conf.default.accept_redirects = 0

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

$ sudo sysctl --system

See Also

https://workbench.cisecurity.org/benchmarks/27024

Item Details

Category: CONFIGURATION MANAGEMENT

References: 800-53|CM-6b., CCI|CCI-000366, Rule-ID|SV-271882r1092358_rule, STIG-ID|OL09-00-006045, Vuln-ID|V-271882

Plugin: Unix

Control ID: e78af1db8a99d2fd682d98a73b55f1839adeb052e9684c43221fc9cf4d8baca4