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The SUSE operating system must prevent Internet Protocol version 4 (IPv4) Internet Control Message Protocol (ICMP) redirect messages from being accepted.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-77493 | SLES-12-030390 | SV-92189r4_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 |
|---|---|
| SLES 12 Security Technical Implementation Guide | 2020-06-30 |
Details
| Check Text ( C-77053r3_chk ) |
|---|
| Verify the SUSE operating system does not accept ICMP redirect messages. Check the value of the "net.ipv4.conf.all.accept_redirects" variable with the following command: # sysctl net.ipv4.conf.all.accept_redirects net.ipv4.conf.all.accept_redirects =0 If the returned line does not have a value of "0" this is a finding. |
| Fix Text (F-84135r4_fix) |
|---|
| Configure the SUSE operating system to the required kernel parameter 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 Run the following command to apply this value: # sysctl --system |