The system must not send IPv4 ICMP redirects by default.

From Apple OS X 10.9 (Mavericks) Workstation Security Technical Implementation Guide

Part of SRG-OS-000480

Associated with: CCI-000366

SV-72879r1_rule The system must not send IPv4 ICMP redirects by default.

Vulnerability discussion

ICMP redirects are broadcast in order to reshape network traffic. A malicious user could use the system to send fake redirect packets and try to force all network traffic to pass through a network sniffer. Disabling ICMP redirect broadcasts mitigates this risk.

Check content

To check if the system is configured to send ICMP redirects, run the following command: sysctl net.inet.ip.redirect If the values are not set to '0', this is a finding.

Fix text

To configure the system to not send ICMP redirects, add the following line to /etc/sysctl.conf: net.inet.ip.redirect=0

Pro Tips

Lavender hyperlinks in small type off to the right (of CSS class id, if you view the page source) point to globally unique URIs for each document and item. Copy the link location and paste anywhere you need to talk unambiguously about these things.

You can obtain data about documents and items in other formats. Simply provide an HTTP header Accept: text/turtle or Accept: application/rdf+xml.

Powered by sagemincer