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The Cisco ACI must be configured to have Internet Control Message Protocol (ICMP) mask replies disabled on all external interfaces.

Overview

Finding IDVersionRule IDIA ControlsSeverity
V-272087CACI-RT-000027SV-272087r1168151_ruleCCI-002385medium
Description
The ICMP supports IP traffic by relaying information about paths, routes, and network conditions. Routers automatically send ICMP messages under a wide variety of conditions. Mask Reply ICMP messages are commonly used by attackers for network mapping and diagnosis.
STIGDate
Cisco ACI Router Security Technical Implementation Guide2025-12-11

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-272087r1168151_chk)

Review the router configuration and verify IP mask replies have been disabled on all external interfaces using any of the following options: 1. For contracts with external L3out traffic, verify specific allow statements do not allow any ICMP type 17 packets. 2. Verify the Filter for ICMP Type 17 and confirm that every contract that allows ICMP has the type 17 explicit deny to prevent this request. 3. Configure a Taboo contract (blacklist) that explicitly denies ICMP type 17. If IP mask replies are not disabled on all external interfaces, this is a finding.

Fix Text (F-76044r1168150_fix)

Disable IP mash replies on all external interfaces using any of the following options. 1. ACI is a whitelist model by default, so all traffic is denied by default. When contracts are added, users can be specific with the allow statements to avoid allowing any ICMP type 17 packets. 2. Configure the filter for ICMP Type 17 and confirm every contract that allows ICMP has the type 17 explicit deny to prevent this request. 3. Configure a Taboo contract (blacklist) that explicitly denies ICMP type 17.