The system must not forward IPv6 source-routed packets.

From Oracle Linux 5 Security Technical Implementation Guide

Associated with: CCI-001551

SV-63393r1_rule The system must not forward IPv6 source-routed packets.

Vulnerability 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: # egrep "net.ipv6.conf.*forwarding" /etc/sysctl.conf If there are no entries found or the 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

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