Finding ID | Version | Rule ID | IA Controls | Severity |
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V-217295 | SLES-12-030420 | SV-217295r603262_rule | Medium |
Description |
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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 |
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SLES 12 Security Technical Implementation Guide | 2023-09-08 |
Check Text ( C-18523r370041_chk ) |
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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.all.send_redirects net.ipv4.conf.all.send_redirects =0 If the returned line does not have a value of "0” this is a finding. |
Fix Text (F-18521r370042_fix) |
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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 |