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V-22553

CAT II (Medium)

The system must not forward IPv6 source-routed packets.

Rule ID

SV-45992r1_rule

STIG

SUSE Linux Enterprise Server v11 for System z Security Technical Implementation Guide

Version

V1R12

CCIs

CCI-001551

Discussion

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.

Check Content

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

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