The Oracle Linux operating system must not forward Internet Protocol version 4 (IPv4) 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-221873r991589_rule
- Version
- OL07-00-040610
- Severity
- Medium
- References
- Updated
Remediation Templates
A Manual Procedure
Set the system to the required kernel parameter by adding the following line to "/etc/sysctl.conf" or a configuration file in the /etc/sysctl.d/ directory (or modify the line to have the required value):
net.ipv4.conf.all.accept_source_route = 0
Issue the following command to make the changes take effect:
# sysctl -system