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The system must ignore Internet Protocol version 4 (IPv4) Internet Control Message Protocol (ICMP) redirect messages.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-73175 | RHEL-07-040641 | SV-87827r2_rule | Medium |
| Description |
|---|
| 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. |
| STIG | Date |
|---|---|
| Red Hat Enterprise Linux 7 Security Technical Implementation Guide | 2017-07-08 |
Details
| Check Text ( C-73299r1_chk ) |
|---|
| Verify the system ignores IPv4 ICMP redirect messages. Check the value of the "accept_redirects" variables with the following command: # /sbin/sysctl -a | grep 'net.ipv4.conf.all.accept_redirects' net.ipv4.conf.all.accept_redirects=0 If both of the returned lines do not have a value of "0", or a line is not returned, this is a finding. |
| Fix Text (F-79621r2_fix) |
|---|
| Set the system to ignore IPv4 ICMP redirect messages by adding the following line to "/etc/sysctl.conf" (or modify the line to have the required value): net.ipv4.conf.all.accept_redirects = 0 |