Detections
Analytics

1.198 SLES-15-040320

Information

The SUSE operating system must not forward Internet Protocol version 4 (IPv4) source-routed packets by default.

GROUP ID: V-235016
RULE ID: SV-235016r991589

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.

Solution

Configure the SUSE operating system to disable IPv4 default source routing by running the following command as an administrator:

sudo sysctl -w net.ipv4.conf.default.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.ipv4.conf.default.accept_source_route=0" >> /etc/sysctl.d/99-stig.conf' sudo sysctl --system

See Also

https://workbench.cisecurity.org/benchmarks/23779

Item Details

Category: CONFIGURATION MANAGEMENT

References: 800-53|CM-6b., CAT|II, CCI|CCI-000366, Rule-ID|SV-235016r991589_rule, STIG-ID|SLES-15-040320, Vuln-ID|V-235016

Plugin: Unix

Control ID: 3c89f3575b1c46fe1b8d9adc833c58360a8bbfd95bc8eeeca03a555ca02d4eb3