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Ubuntu OS must configure the Uncomplicated Firewall (ufw) to rate limit impacted network interfaces.

Overview

Finding IDVersionRule IDIA ControlsSeverity
V-275611RIIM-OS-251025SV-275611r1147883_ruleCCI-002385medium
Description
Denial of service (DoS) is a condition when a resource is not available for legitimate users. When this occurs, the organization either cannot accomplish its mission or must operate at degraded capacity. This requirement addresses the configuration of the operating system to mitigate the impact of DoS attacks that have occurred or are ongoing on system availability. For each system, known and potential DoS attacks must be identified and solutions for each type implemented. A variety of technologies exist to limit or, in some cases, eliminate the effects of DoS attacks (e.g., limiting processes or establishing memory partitions). Employing increased capacity and bandwidth, combined with service redundancy, may reduce the susceptibility to some DoS attacks.
STIGDate
Riverbed NetIM OS Security Technical Implementation Guide2025-10-02

Related Frameworks

1 mapping across 4 frameworks
SCF0 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (13) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

MON-01Continuous Monitoring
1.00
MON-01.1Intrusion Detection & Prevention Systems (IDS & IPS)
1.00
MON-01.3Inbound & Outbound Communications Traffic
1.00
MON-01.4System Generated Alerts
1.00
MON-01.8Security Event Monitoring
1.00
NET-01Network Security Controls (NSC)
1.00
NET-02Layered Network Defenses
1.00
SEA-01Secure Engineering Principles
1.00
SEA-02Alignment With Enterprise Architecture
1.00
CAP-01Capacity & Performance Management
0.50

+3 more (top 10 by confidence shown)

NIST 800-530 mappings

No source states a mapping between these directly.

Also reachable in 2 hops (36) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

AC-10Concurrent Session Control
1.00
AC-17(9)Disconnect or Disable Access
1.00
AC-2(4)Automated Audit Actions
1.00
AC-3Access Enforcement
1.00
AC-4Information Flow Enforcement
1.00
AC-6(9)Log Use of Privileged Functions
1.00
AU-12Audit Record Generation
1.00
AU-3Content of Audit Records
1.00
AU-5Response to Audit Logging Process Failures
1.00
CM-11(2)Software Installation with Privileged Status
1.00

+26 more (top 10 by confidence shown)

CCI1 mapping
CCI-002385
1.00
NIST CSF 2.00 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (3) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

DE.CM-01
1.00
PR.IR-01
1.00
PR.IR-04
0.50

Who does this work

12 NICE work roles and 9 EC-Council certifications.

This is an inference across published mappings, not a single claim by anyone. This check maps to a control, which maps to a Cybersecurity Framework outcome, which NIST assigns to the work roles below. EC-Council separately maps its certifications to those same roles.

A certification prepares someone for a role. It is not evidence that a holder is qualified, and neither NIST nor EC-Council has stated that any certification here addresses this check.

Work-role assignments published by NIST (NICE Framework Components 2.2.0 and the CSF 2.0 OLIR crosswalk). Certification mappings published by EC-Council.

Details

Check Text (C-275611r1147883_chk)

Verify an application firewall is configured to rate limit any connection to the system. Check all the services listening to the ports by using the following command: $ ss -l46ut Netid State Recv-Q Send-Q Local Address:Port Peer Address:Port Process tcp LISTEN 0 511 *:http *:* tcp LISTEN 0 128 [::]:ssh tcp LISTEN 0 128 [::]:ipp [::]:* tcp LISTEN 0 128 [::]:smtp [::]:* For each entry, verify that the ufw is configured to rate limit the service ports by using the following command: $ sudo ufw status Status: active To Action From -- ------ ---- 80/tcp LIMIT Anywhere 25/tcp LIMIT Anywhere Anywhere DENY 240.9.19.81 443 LIMIT Anywhere 22/tcp LIMIT Anywhere 80/tcp (v6) LIMIT Anywhere 25/tcp (v6) LIMIT Anywhere 22/tcp (v6) LIMIT Anywhere (v6) 25 DENY OUT Anywhere 25 (v6) DENY OUT Anywhere (v6) If any port with a state of "LISTEN" that does not have an action of "DENY", is not marked with the "LIMIT" action, this is a finding.

Fix Text (F-79618r1147882_fix)

Configure the application firewall to protect against or limit the effects of DoS attacks by ensuring Ubuntu OS is implementing rate-limiting measures on impacted network interfaces. For each service with a port listening to connections, run the following command, replacing "<service_name>" with the service that needs to be rate limited. $ sudo ufw limit <service_name> Rate-limiting can also be done on an interface. An example of adding a rate limit on the "ens160" interface follows: $ sudo ufw limit in on ens160