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The SUSE operating system must prevent Internet Protocol version 6 (IPv6) Internet Control Message Protocol (ICMP) redirect messages from being accepted.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-237621 | SLES-12-030363 | SV-237621r646826_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 | 2023-06-02 |
Details
| Check Text ( C-40840r646824_chk ) |
|---|
| Verify the SUSE operating system does not accept IPv6 source-routed packets by default. Verify the SUSE operating system does not accept IPv6 ICMP redirect messages. Check the value of the IPv6 accept_redirects variable with the following command: > sudo sysctl net.ipv6.conf.all.accept_redirects net.ipv6.conf.all.accept_redirects =0 If the network parameter "ipv6.conf.all.accept_redirects" is not equal to "0" or nothing is returned, this is a finding. |
| Fix Text (F-40803r646825_fix) |
|---|
| Configure the SUSE operating system to not accept IPv6 ICMP redirect messages by running the following command as an administrator: > sudo sysctl -w net.ipv6.conf.all.accept_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.ipv6.conf.all.accept_redirects=0" >> /etc/sysctl.d/99-stig.conf' > sudo sysctl --system |