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V-258890

CAT II (Medium)

The Photon operating system must not send IPv4 Internet Control Message Protocol (ICMP) redirects.

Rule ID

SV-258890r933731_rule

STIG

VMware vSphere 8.0 vCenter Appliance Photon OS 4.0 Security Technical Implementation Guide

Version

V1R1

CCIs

CCI-000366

Discussion

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.

Check Content

At the command line, run the following command to verify ICMP send redirects are not accepted:

# /sbin/sysctl -a --pattern "net.ipv4.conf.(all|default).send_redirects"

Expected result:

net.ipv4.conf.all.send_redirects = 0
net.ipv4.conf.default.send_redirects = 0

If the "send_redirects" kernel parameters are not set to "0", this is a finding.

Fix Text

Navigate to and open:

/etc/sysctl.d/zz-stig-hardening.conf

Add or update the following lines:

net.ipv4.conf.all.send_redirects = 0
net.ipv4.conf.default.send_redirects = 0

At the command line, run the following command to load the new configuration:

# /sbin/sysctl --load /etc/sysctl.d/zz-stig-hardening.conf

Note: If the file zz-stig-hardening.conf does not exist, it must be created.