The system must log martian packets.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-22418	GEN003611	SV-38868r1_rule	ECAT-1	Low

Description
Martian packets are packets containing addresses known by the system to be invalid. Logging these messages allows the SA to identify misconfigurations or attacks in progress.

STIG	Date
AIX 6.1 SECURITY TECHNICAL IMPLEMENTATION GUIDE	2017-12-08

Details

Check Text ( C-37862r1_chk )
Determine if the system is configured to log martian packets. Examine the IPF rules on the system. # lsfilt -a There must be rules to log inbound traffic containing invalid source addresses, which minimally include the system's own addresses and broadcast addresses for attached subnets. If no such rules exist, this is a finding.

Fix Text (F-33122r2_fix)
Configure the system to log martian packets. Add rules to log inbound traffic containing invalid source addresses, which minimally include the system's own addresses and broadcast addresses for attached subnets. For example, consider a system with a single network connection having IP address 192.168.1.10 with a local subnet broadcast address of 192.168.1.255. Packets with source addresses of 192.168.1.10 and 192.168.1.255 must be logged if received by the system from the network connection. Use the smit utility or genfilt command to add logging of martian packets (packets with a source address of 192.168.1.10 and 192.168.1.255). # smitty ipsec4 OR # genfilt -v4 -a P -s 192.168.1.10 -m 0.0.0.0 -d 0.0.0.0 -M -0.0.0.0 -c all -o any -O any -p 0 -P 0 -w I -l y -i en0 # genfilt -v4 -a P -s 192.168.1.255 -m 0.0.0.0 -d 0.0.0.0 -M -0.0.0.0 -c all -o any -O any -p 0 -P 0 -w I -l y -i en0

Fix Text (F-33122r2_fix)

Configure the system to log martian packets.

Add rules to log inbound traffic containing invalid source addresses, which minimally include the system's own addresses and broadcast addresses for attached subnets.

For example, consider a system with a single network connection having IP address 192.168.1.10 with a local subnet broadcast address of 192.168.1.255.
Packets with source addresses of 192.168.1.10 and 192.168.1.255 must be logged if received by the system from the network connection.
Use the smit utility or genfilt command to add logging of martian packets (packets with a source address of 192.168.1.10 and 192.168.1.255).

# smitty ipsec4

OR

# genfilt -v4 -a P -s 192.168.1.10 -m 0.0.0.0 -d 0.0.0.0 -M -0.0.0.0 -c all -o any -O any -p 0 -P 0 -w I -l y -i en0
# genfilt -v4 -a P -s 192.168.1.255 -m 0.0.0.0 -d 0.0.0.0 -M -0.0.0.0 -c all -o any -O any -p 0 -P 0 -w I -l y -i en0