TOSS must not forward IPv6 source-routed packets by default.
Severity | Group ID | Group Title | Version | Rule ID | Date | STIG Version |
|---|---|---|---|---|---|---|
| medium | V-253126 | SRG-OS-000480-GPOS-00227 | TOSS-04-040850 | SV-253126r991589_rule | 2024-05-30 | 2 |
| 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 forwarding is enabled and the system is functioning as a router. |
| ℹ️ Check |
|---|
| Verify TOSS does not accept IPv6 source-routed packets by default. Note: If IPv6 is disabled on the system, this requirement is Not Applicable. Check the value of the accept source route variable with the following command: $ sudo sysctl net.ipv6.conf.default.accept_source_route net.ipv6.conf.default.accept_source_route = 0 If the returned line does not have a value of "0", a line is not returned, or the line is commented out, this is a finding. |
| ✔️ Fix |
|---|
| Configure TOSS to not forward IPv6 source-routed packets by default with the following command: $ sudo sysctl -w net.ipv6.conf.default.accept_source_route=0 If "0" is not the system's default value then add or update the following line in the appropriate file under "/etc/sysctl.d": net.ipv6.conf.default.accept_source_route=0 |