TOSS must not forward 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 forwarding is enabled and the system is functioning as a router.
- ID
- SV-253127r991589_rule
- Version
- TOSS-04-040860
- Severity
- Medium
- References
- Updated
Remediation Templates
A Manual Procedure
Configure TOSS to not forward IPv6 source-routed packets with the following command:
$ sudo sysctl -w net.ipv6.conf.all.accept_source_route=0
If "0" is not the system's all value then add or update the following line in the appropriate file under "/etc/sysctl.d":
net.ipv6.conf.all.accept_source_route=0