Finding ID | Version | Rule ID | IA Controls | Severity |
---|---|---|---|---|
V-22417 | GEN003610 | SV-64205r1_rule | ECSC-1 | 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 |
---|---|
Oracle Linux 5 Security Technical Implementation Guide | 2015-06-05 |
Check Text ( C-52663r1_chk ) |
---|
Verify the system does not send IPv4 ICMP redirect messages. # grep [01] /proc/sys/net/ipv4/conf/*/send_redirects|egrep "default|all" If all of the resulting lines do not end with "0", this is a finding. |
Fix Text (F-54815r1_fix) |
---|
Configure the system to not send IPv4 ICMP redirect messages. Edit /etc/sysctl.conf and add a setting for "net.ipv4.conf.all.send_redirects=0" and "net.ipv4.conf.default.send_redirects=0". # sysctl -p |