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The SUSE operating system must not send Internet Protocol version 4 (IPv4) Internet Control Message Protocol (ICMP) redirects.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-77499 | SLES-12-030420 | SV-92195r3_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 contain information from the system's route table, possibly revealing portions of the network topology. |
| STIG | Date |
|---|---|
| SLES 12 Security Technical Implementation Guide | 2019-03-12 |
Details
| Check Text ( C-77059r1_chk ) |
|---|
| Verify the SUSE operating system does not send IPv4 ICMP redirect messages. Check the value of the "all send_redirects" variables with the following command: # sysctl net.ipv4.conf.default.send_redirects net.ipv4.conf.default.send_redirects = 0 If the returned line does not have a value of "0” this is a finding. |
| Fix Text (F-84141r3_fix) |
|---|
| Configure the SUSE operating system to not allow interfaces to perform IPv4 ICMP redirects. Set the 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.send_redirects=0 Run the following command to apply this value: # sysctl --system |