The SUSE operating system must not forward Internet Protocol version 6 (IPv6) source-routed packets.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-217288	SLES-12-030361	SV-217288r603262_rule		Medium

Description
Source-routed packets allow the source of the packet to suggest that routers forward the packet along a different path than configured on the router, which can be used to bypass network security measures. This requirement applies only to the forwarding of source-routed traffic, such as when IPv4 forwarding is enabled and the system is functioning as a router.

STIG	Date
SLES 12 Security Technical Implementation Guide	2022-09-13

Details

Check Text ( C-18516r370020_chk )
Verify the SUSE operating system does not accept IPv6 source-routed packets. Check the value of the accept source route variable with the following command: # sudo sysctl net.ipv6.conf.all.accept_source_route net.ipv6.conf.all.accept_source_route = 0 If the returned line does not have a value of "0", this is a finding.

Fix Text (F-18514r370021_fix)
Configure the SUSE operating system to not accept IPv6 source-routed packets by adding the following line to "/etc/sysctl.conf" (or modify the line to have the required value): net.ipv6.conf.all.accept_source_route = 0 Run the following command to apply this value: # sysctl --system