|Finding ID||Version||Rule ID||IA Controls||Severity|
|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.|
|SUSE Linux Enterprise Server 15 Security Technical Implementation Guide||2022-12-07|
|Check Text ( C-38203r619314_chk )|
| Verify the SUSE operating system does not accept IPv6 source-routed packets. |
Check the value of the IPv6 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 network parameter "ipv6.conf.all.accept_source_route" is not equal to "0" or nothing is returned, this is a finding.
|Fix Text (F-38166r619315_fix)|
| Configure the SUSE operating system 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