STIGQter: STIG Summary: Oracle Linux 6 Security Technical Implementation Guide Version: 2 Release: 3 Benchmark Date: 23 Apr 2021:

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

DISA Rule

SV-208864r603263_rule

Vulnerability Number

V-208864

Group Title

SRG-OS-000480

Rule Version

OL6-00-000097

Severity

CAT II

CCI(s)

• CCI-000366 - The organization implements the security configuration settings.

Weight

10

Fix Recommendation

To set the runtime status of the "net.ipv4.conf.default.rp_filter" kernel parameter, run the following command:

# sysctl -w net.ipv4.conf.default.rp_filter=1

If this is not the system's default value, add the following line to "/etc/sysctl.conf":

net.ipv4.conf.default.rp_filter = 1

Check Contents

The status of the "net.ipv4.conf.default.rp_filter" kernel parameter can be queried by running the following command:

$ sysctl net.ipv4.conf.default.rp_filter

The output of the command should indicate a value of "1". If this value is not the default value, investigate how it could have been adjusted at runtime, and verify it is not set improperly in "/etc/sysctl.conf".

$ grep net.ipv4.conf.default.rp_filter /etc/sysctl.conf

If the correct value is not returned, this is a finding.

Vulnerability Number

V-208864

Documentable

False

Rule Version

OL6-00-000097

Severity Override Guidance

The status of the "net.ipv4.conf.default.rp_filter" kernel parameter can be queried by running the following command:

$ sysctl net.ipv4.conf.default.rp_filter

The output of the command should indicate a value of "1". If this value is not the default value, investigate how it could have been adjusted at runtime, and verify it is not set improperly in "/etc/sysctl.conf".

$ grep net.ipv4.conf.default.rp_filter /etc/sysctl.conf

If the correct value is not returned, this is a finding.

Check Content Reference

M

Target Key

2928

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