STIGQter STIGQter: STIG Summary: Oracle Linux 7 Security Technical Implementation Guide Version: 2 Release: 3 Benchmark Date: 23 Apr 2021:

The Oracle Linux operating system must use a reverse-path filter for IPv4 network traffic when possible by default.

DISA Rule

SV-221875r603260_rule

Vulnerability Number

V-221875

Group Title

SRG-OS-000480-GPOS-00227

Rule Version

OL07-00-040612

Severity

CAT II

CCI(s)

Weight

10

Fix Recommendation

Set the system to the required kernel parameter by adding the following line to "/etc/sysctl.conf" or a configuration file in the /etc/sysctl.d/ directory (or modify the line to have the required value):

net.ipv4.conf.default.rp_filter = 1

Issue the following command to make the changes take effect:

# sysctl --system

Check Contents

Verify the system uses a reverse-path filter for IPv4:

# grep net.ipv4.conf.default.rp_filter /etc/sysctl.conf /etc/sysctl.d/*
net.ipv4.conf.default.rp_filter = 1

If "net.ipv4.conf.default.rp_filter" is not configured in the /etc/sysctl.conf file or in the /etc/sysctl.d/ directory, is commented out, or does not have a value of "1", this is a finding.

Check that the operating system implements the accept source route variable with the following command:

# /sbin/sysctl -a | grep net.ipv4.conf.default.rp_filter
net.ipv4.conf.default.rp_filter = 1

If the returned line does not have a value of "1", this is a finding.

Vulnerability Number

V-221875

Documentable

False

Rule Version

OL07-00-040612

Severity Override Guidance

Verify the system uses a reverse-path filter for IPv4:

# grep net.ipv4.conf.default.rp_filter /etc/sysctl.conf /etc/sysctl.d/*
net.ipv4.conf.default.rp_filter = 1

If "net.ipv4.conf.default.rp_filter" is not configured in the /etc/sysctl.conf file or in the /etc/sysctl.d/ directory, is commented out, or does not have a value of "1", this is a finding.

Check that the operating system implements the accept source route variable with the following command:

# /sbin/sysctl -a | grep net.ipv4.conf.default.rp_filter
net.ipv4.conf.default.rp_filter = 1

If the returned line does not have a value of "1", this is a finding.

Check Content Reference

M

Target Key

4089

Comments