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 not forward IPv4 source-routed packets by default.

DISA Rule

SV-282691r1201053_rule

Vulnerability Number

V-282691

Group Title

SRG-OS-000480-GPOS-00227

Rule Version

TOSS-05-000219

Severity

CAT II

CCI(s)

CCI-000366 - Implement the security configuration settings.

Weight

Fix Recommendation

Configure TOSS 5 to not forward IPv4 source-routed packets by default.

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

net.ipv4.conf.default.accept_source_route = 0

Load settings from all system configuration files using the following command:

$ sudo sysctl --system

Check Contents

Verify TOSS 5 does not accept IPv4 source-routed packets by default using the following command:

$ sudo sysctl net.ipv4.conf.default.accept_source_route

net.ipv4.conf.default.accept_source_route = 0

If the returned line does not have a value of "0", a line is not returned, this is a finding.

Vulnerability Number

V-282691

Documentable

False

Rule Version

TOSS-05-000219

Severity Override Guidance

Check Content Reference

Target Key

5738