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The system must not send IPv4 ICMP redirects.


Overview

Finding ID Version Rule ID IA Controls Severity
V-226898 GEN003610 SV-226898r603265_rule Medium
Description
ICMP redirect messages are used by routers to inform hosts that a more direct route exists for a particular destination. These messages contain information from the system's route table that could reveal portions of the network topology.
STIG Date
Solaris 10 SPARC Security Technical Implementation Guide 2020-12-04

Details

Check Text ( C-29060r484978_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 send IPv4 ICMP redirect messages.

Procedure:
# ndd /dev/ip ip_send_redirects

If the result is not 0, this is a finding.
Fix Text (F-29048r484979_fix)
Configure the system to not send IPv4 ICMP redirect messages.

Procedure:
# ndd -set /dev/ip ip_send_redirects 0

Also add this command to a system startup script.