STIGQter: STIG Summary: Tri-Lab Operating System Stack (TOSS) 5 Security Technical Implementation Guide Version: 1 Release: 1 Benchmark Date: 26 Mar 2026:

TOSS 5 must use reverse path filtering on all IPv4 interfaces.

DISA Rule

SV-282689r1201344_rule

Vulnerability Number

V-282689

Group Title

SRG-OS-000480-GPOS-00227

Rule Version

TOSS-05-000217

Severity

CAT II

CCI(s)

• CCI-000366 - Implement the security configuration settings.

Weight

10

Fix Recommendation

Configure TOSS 5 to use reverse path filtering on all IPv4 interfaces.

Add or edit the following line in a single system configuration file, in the "/etc/sysctl.d/" directory:

net.ipv4.conf.all.rp_filter = 1

Reload the system configuration files for the changes to take effect.

$ sudo sysctl --system

Check Contents

Verify TOSS 5 uses reverse path filtering on all IPv4 interfaces using the following command:

$ sudo sysctl net.ipv4.conf.all.rp_filter

net.ipv4.conf.all.rp_filter = 1

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

Vulnerability Number

V-282689

Documentable

False

Rule Version

TOSS-05-000217

Severity Override Guidance

Verify TOSS 5 uses reverse path filtering on all IPv4 interfaces using the following command:

$ sudo sysctl net.ipv4.conf.all.rp_filter

net.ipv4.conf.all.rp_filter = 1

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

Check Content Reference

M

Target Key

5738