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


Overview

Finding ID Version Rule ID IA Controls Severity
V-22412 GEN003605 SV-35028r1_rule ECSC-1 Medium
Description
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.
STIG Date
HP-UX 11.31 Security Technical Implementation Guide 2018-09-14

Details

Check Text ( C-36505r1_chk )
Determine if the system is configured to forward source-routed IP packets. When
correctly configured, if ip_forward_src_routed is disabled, the system is also configured
to disable reverse source routing to TCP responses to source-routed packets.
# ndd -get /dev/ip ip_forward_src_routed

If the returned value is not '0', this feature is enabled and this is a finding.

Fix Text (F-31862r1_fix)
Disable the IP source-routed forwarding feature.
# ndd -set /dev/ip ip_forward_src_routed 0

Edit /etc/rc.config.d/nddconf and add/set:
TRANSPORT_NAME[x] = ip
NDD_NAME[x] = ip_forward_src_routed
NDD_VALUE[x] = 0