STIGQter: STIG Summary: Riverbed NetIM OS Security Technical Implementation Guide Version: 1 Release: 1 Benchmark Date: 11 Sep 2025:

Ubuntu OS must be configured to prohibit or restrict the use of functions, ports, protocols, and/or services, as defined in the Ports, Protocols, and Services Management Category Assurance List (PPSM CAL) and vulnerability assessments.

DISA Rule

SV-275612r1147886_rule

Vulnerability Number

V-275612

Group Title

SRG-OS-000096-GPOS-00050

Rule Version

RIIM-OS-251030

Severity

CAT II

CCI(s)

• CCI-000382 - Configure the system to prohibit or restrict the use of organization-defined prohibited or restricted functions, system ports, protocols, software, and/or services.

Weight

10

Fix Recommendation

Add all ports, protocols, or services allowed by the PPSM CLSA by using the following command:

$ sudo ufw allow <direction> <port/protocol/service>

Where the direction is "in" or "out" and the port is the one corresponding to the protocol or service allowed.

To deny access to ports, protocols, or services, use:

$ sudo ufw deny <direction> <port/protocol/service>

Check Contents

Check the firewall configuration for any unnecessary or prohibited functions, ports, protocols, and/or services by using the following command:

$ sudo ufw show raw
Chain INPUT (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination

Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination

Chain OUTPUT (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination

Ask the system administrator for the site or program PPSM Components Local Services Assessment (CLSA). Verify the services allowed by the firewall match the PPSM CLSA.

If there are any additional ports, protocols, or services that are not included in the PPSM CLSA, this is a finding.

If there are any ports, protocols, or services that are prohibited by the PPSM CAL, this is a finding.

Vulnerability Number

V-275612

Documentable

False

Rule Version

RIIM-OS-251030

Severity Override Guidance

Check the firewall configuration for any unnecessary or prohibited functions, ports, protocols, and/or services by using the following command:

$ sudo ufw show raw
Chain INPUT (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination

Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination

Chain OUTPUT (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination

Ask the system administrator for the site or program PPSM Components Local Services Assessment (CLSA). Verify the services allowed by the firewall match the PPSM CLSA.

If there are any additional ports, protocols, or services that are not included in the PPSM CLSA, this is a finding.

If there are any ports, protocols, or services that are prohibited by the PPSM CAL, this is a finding.

Check Content Reference

M

Target Key

5706