The system must not apply reversed source routing to TCP responses.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-22412	GEN003605	SV-26626r2_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.

STIG	Date
SOLARIS 10 X86 SECURITY TECHNICAL IMPLEMENTATION GUIDE	2016-06-22

Details

Check Text ( C-27663r2_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 system does not apply reversed source routing to TCP responses. # ndd /dev/tcp tcp_rev_src_routes If the result is not 0, this is a finding.

Check Text ( C-27663r2_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 system does not apply reversed source routing to TCP responses.

# ndd /dev/tcp tcp_rev_src_routes

If the result is not 0, this is a finding.

Fix Text (F-23868r1_fix)
Configure the system to not apply reversed source routing to TCP responses. # ndd -set /dev/tcp tcp_rev_src_routes 0 Also add this command to a system startup script.