TOSS must not allow interfaces to perform Internet Control Message Protocol (ICMP) redirects by default.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
medium	V-253123	SRG-OS-000480-GPOS-00227	TOSS-04-040820	SV-253123r991589_rule	2024-05-30	2

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. There are notable differences between Internet Protocol version 4 (IPv4) and Internet Protocol version 6 (IPv6). There is only a directive to disable sending of IPv4 redirected packets. Refer to RFC4294 for an explanation of "IPv6 Node Requirements", which resulted in this difference between IPv4 and IPv6.

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. There are notable differences between Internet Protocol version 4 (IPv4) and Internet Protocol version 6 (IPv6). There is only a directive to disable sending of IPv4 redirected packets. Refer to RFC4294 for an explanation of "IPv6 Node Requirements", which resulted in this difference between IPv4 and IPv6.

ℹ️ Check
Verify TOSS does not allow interfaces to perform Internet Protocol version 4 (IPv4) ICMP redirects by default. Note: If IPv4 is disabled on the system, this requirement is Not Applicable. Check the value of the "default send_redirects" variables with the following command: $ sudo sysctl net.ipv4.conf.default.send_redirects net.ipv4.conf.default.send_redirects=0 If the returned line does not have a value of "0", or a line is not returned, this is a finding.

ℹ️ Check

Verify TOSS does not allow interfaces to perform Internet Protocol version 4 (IPv4) ICMP redirects by default. Note: If IPv4 is disabled on the system, this requirement is Not Applicable. Check the value of the "default send_redirects" variables with the following command: $ sudo sysctl net.ipv4.conf.default.send_redirects net.ipv4.conf.default.send_redirects=0 If the returned line does not have a value of "0", or a line is not returned, this is a finding.

✔️ Fix
Configure TOSS to not allow interfaces to perform Internet Protocol version 4 (IPv4) ICMP redirects by default with the following command: $ sudo sysctl -w net.ipv4.conf.default.send_redirects=0 If "0" is not the system's default value then add or update the following line in the appropriate file under "/etc/sysctl.d": net.ipv4.conf.default.send_redirects=0