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The SUSE operating system must not allow interfaces to accept Internet Protocol version 4 (IPv4) Internet Control Message Protocol (ICMP) redirect messages by default.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-217292 | SLES-12-030400 | SV-217292r603262_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 | 2021-03-04 |
Details
| Check Text ( C-18520r370032_chk ) |
|---|
| Verify the SUSE operating system ignores IPv4 ICMP redirect messages. Check the value of the "accept_redirects" variables with the following command: # sysctl net.ipv4.conf.default.accept_redirects net.ipv4.conf.default.accept_redirects = 0 If the returned line does not have a value of "0" this is a finding. |
| Fix Text (F-18518r370033_fix) |
|---|
| Configure the SUSE operating system ignores 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.default.accept_redirects = 0 Run the following command to apply this value: # sysctl --system |