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← Back to SUSE Linux Enterprise Server v11 for System z Security Technical Implementation Guide

V-12002

CAT II (Medium)

The system must not forward IPv4 source-routed packets.

Rule ID

SV-45719r1_rule

STIG

SUSE Linux Enterprise Server v11 for System z Security Technical Implementation Guide

Version

V1R12

CCIs

CCI-001551

Discussion

Source-routed packets allow the source of the packet to suggest 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.

Check Content

Verify the system does not accept source-routed IPv4 packets.

Procedure:
# grep [01] /proc/sys/net/ipv4/conf/*/accept_source_route|egrep "default|all"

If all of the returned lines do not end with 0, this is a finding.

Note: The same setting is used by Linux for both the local acceptance and forwarding of source-routed IPv4 packets.

Fix Text

Configure the system to not accept source-routed IPv4 packets.
Edit /etc/sysctl.conf and add a setting for "net.ipv4.conf.all.accept_source_route=0" and "net.ipv4.conf.default.accept_source_route=0". 

Reload the sysctls.
Procedure:
# sysctl -p