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SLEM 5 must not send Internet Protocol version 4 (IPv4) Internet Control Message Protocol (ICMP) redirects.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-261317 | SLEM-05-253030 | SV-261317r996421_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 |
|---|---|
| SUSE Linux Enterprise Micro (SLEM) 5 Security Technical Implementation Guide | 2024-06-04 |
Details
| Check Text ( C-65046r996419_chk ) |
|---|
| Verify SLEM 5 does not allow interfaces to perform IPv4 ICMP redirects with the following command: > sudo sysctl net.ipv4.conf.all.send_redirects net.ipv4.conf.all.send_redirects = 0 If the network parameter "ipv4.conf.all.send_redirects" is not equal to "0", or nothing is returned, this is a finding. |
| Fix Text (F-64954r996420_fix) |
|---|
| Configure SLEM 5 to not allow interfaces to perform IPv4 ICMP redirects by running the following command as an administrator: > sudo sysctl -w net.ipv4.conf.all.send_redirects=0 If "0" is not the system's default value, add or update the following line in "/etc/sysctl.d/99-stig.conf": > sudo sh -c 'echo "net.ipv4.conf.all.send_redirects=0" >> /etc/sysctl.d/99-stig.conf' > sudo sysctl --system |