SLEM 5 must not forward Internet Protocol version 6 (IPv6) source-routed packets.

An XCCDF Rule

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.

ID: SV-261321r996433_rule
Version: SLEM-05-254010
Severity: Medium
References: CCI-000366
Updated: 5 days ago

Remediation Templates

Configure SLEM 5 to disable IPv6 source routing by running the following command as an administrator:

     > sudo sysctl -w net.ipv6.conf.all.accept_source_route=0

If "0" is not the system's default value, add or update the following line in "/etc/sysctl.d/99-stig.conf":
     > sudo sh -c 'echo "net.ipv6.conf.all.accept_source_route=0" >> /etc/sysctl.d/99-stig.conf'

     > sudo sysctl --system

SLEM 5 must not forward Internet Protocol version 6 (IPv6) source-routed packets.

Description

Remediation Templates

A Manual Procedure