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The system must ignore IPv4 ICMP redirect messages.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-22416 | GEN003609 M6 | SV-38204r1_rule | ECSC-1 | Medium |
| Description |
|---|
| ICMP redirect messages are used by routers to inform hosts of a more direct route existing 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. |
| STIG | Date |
|---|---|
| MAC OSX 10.6 Workstation Security Technical Implementation Guide | 2012-01-30 |
Details
| Check Text ( C-37661r1_chk ) |
|---|
| Open a terminal session and enter the following command to view the value of "net.inet.icmp.drop_redirect". sysctl -a | grep net.inet.icmp.drop_redirect If the value of "net.inet.icmp.drop_redirect" is not set to "0", this is a finding. |
| Fix Text (F-32902r1_fix) |
|---|
| Open a terminal session and edit the /etc/sysctl.conf file and add the following line. net.inet.icmp.drop_redirect=0 NOTE: If the sysctl.conf file does not exist use the following command to create one. touch /etc/sysctl.conf |