The Photon operating system must not send IPv4 Internet Control Message Protocol (ICMP) redirects.
An XCCDF Rule
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.
- ID
- SV-256571r991589_rule
- Version
- PHTN-30-000102
- Severity
- Medium
- References
- Updated
Remediation Templates
A Manual Procedure
At the command line, run the following command:
# for SETTING in $(/sbin/sysctl -aN --pattern "net.ipv4.conf.(all|default|eth.*).send_redirects"); do sed -i -e "/^${SETTING}/d" /etc/sysctl.conf;echo $SETTING=0>>/etc/sysctl.conf; done
# /sbin/sysctl --load