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 not be performing packet forwarding unless the system is a router.

DISA Rule

SV-221889r603260_rule

Vulnerability Number

V-221889

Group Title

SRG-OS-000480-GPOS-00227

Rule Version

OL07-00-040740

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.ip_forward = 0

Issue the following command to make the changes take effect:

# sysctl --system

Check Contents

Verify the system is not performing packet forwarding, unless the system is a router.

# grep net.ipv4.ip_forward /etc/sysctl.conf /etc/sysctl.d/*

net.ipv4.ip_forward = 0

If "net.ipv4.ip_forward" 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 "0", this is a finding.

Check that the operating system does not implement IP forwarding using the following command:

# /sbin/sysctl -a | grep net.ipv4.ip_forward
net.ipv4.ip_forward = 0

If IP forwarding value is "1" and the system is hosting any application, database, or web servers, this is a finding.

Vulnerability Number

V-221889

Documentable

False

Rule Version

OL07-00-040740

Severity Override Guidance

Verify the system is not performing packet forwarding, unless the system is a router.

# grep net.ipv4.ip_forward /etc/sysctl.conf /etc/sysctl.d/*

net.ipv4.ip_forward = 0

If "net.ipv4.ip_forward" 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 "0", this is a finding.

Check that the operating system does not implement IP forwarding using the following command:

# /sbin/sysctl -a | grep net.ipv4.ip_forward
net.ipv4.ip_forward = 0

If IP forwarding value is "1" and the system is hosting any application, database, or web servers, this is a finding.

Check Content Reference

M

Target Key

4089

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