The system must not forward IPv6 source-routed packets.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-22553	GEN007920	SV-45992r1_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 IPv6 forwarding is enabled and the system is functioning as a router.

STIG	Date
SUSE Linux Enterprise Server v11 for System z Security Technical Implementation Guide	2018-09-19

Details

Check Text ( C-43274r1_chk )
Determine if the system is configured to forward IPv6 source-routed packets. Procedure: # sysctl net.ipv6.conf.all.forwarding # sysctl net.ipv6.conf.default.forwarding If any value of the entries is not = "0", this is a finding.

Fix Text (F-39357r1_fix)
Configure the system to not forward IPv6 source-routed packets. Procedure: Edit the /etc/sysctl.conf file to include: net.ipv6.conf.all.forwarding = 0 net.ipv6.conf.default.forwarding = 0 Reload the kernel parameters: # sysctl -p