The system must not send IPv4 ICMP redirects by default.

From Apple OS X 10.8 (Mountain Lion) Workstation STIG

Part of SRG-OS-999999

Associated with: CCI-000366

SV-65527r1_rule The system must not send IPv4 ICMP redirects by default.

Vulnerability discussion

The system must not send IPv4 ICMP redirects by default.

Check content

To check if the system is configured to send ICMP redirects, run the following command: sysctl net.inet.ip.redirect | awk '{ print $NF }' If the value is not set to "0", this is a finding.

Fix text

To disable ICMP redirects, add the following line to /etc/sysctl.conf: net.inet.ip.redirect=0

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