The system must not forward IPv4 source-routed packets.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-12002	GEN003600	SV-27420r2_rule		Medium

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.

STIG	Date
SOLARIS 10 X86 SECURITY TECHNICAL IMPLEMENTATION GUIDE	2017-12-18

Details

Check Text ( C-28606r4_chk )
Determine the type of zone that you are currently securing. # zonename If the zone is not the global zone, determine if any interfaces are exclusive to the zone: # dladm show-link If the output indicates "insufficient privileges" then this requirement is not applicable. If the zone is the global zone or the non-global zone has exclusive interfaces verify the network settings: # ndd /dev/ip ip_forward_src_routed If the returned value is not 0, this is a finding.

Check Text ( C-28606r4_chk )

Determine the type of zone that you are currently securing.
# zonename

If the zone is not the global zone, determine if any interfaces are exclusive to the zone:
# dladm show-link

If the output indicates "insufficient privileges" then this requirement is not applicable.

If the zone is the global zone or the non-global zone has exclusive interfaces verify the network settings:

# ndd /dev/ip ip_forward_src_routed
If the returned value is not 0, this is a finding.

Fix Text (F-24692r1_fix)
Configure the system to not forward IPv4 source-routed packets. Procedure: # ndd /dev/ip ip_forward_src_routed 0 This command must also be added to a system startup script.