Rockwell Automation Allen-Bradley Stratix 5950 Resource Management Errors (CVE-2018-0240)

high Tenable OT Security Plugin ID 506189

Synopsis

The remote OT asset is affected by a vulnerability.

Description

Multiple vulnerabilities in the Application Layer Protocol Inspection feature of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to trigger a reload of an affected device, resulting in a denial of service (DoS) condition. The vulnerabilities are due to logical errors during traffic inspection.
An attacker could exploit these vulnerabilities by sending a high volume of malicious traffic across an affected device. An exploit could allow the attacker to cause a deadlock condition, resulting in a reload of an affected device. These vulnerabilities affect Cisco ASA Software and Cisco FTD Software configured for Application Layer Protocol Inspection running on the following Cisco products: 3000 Series Industrial Security Appliance (ISA), ASA 5500 Series Adaptive Security Appliances, ASA 5500-X Series Next-Generation Firewalls, ASA Services Module for Cisco Catalyst 6500 Series Switches and Cisco 7600 Series Routers, Adaptive Security Virtual Appliance (ASAv), Firepower 2100 Series Security Appliance, Firepower 4100 Series Security Appliance, Firepower 9300 ASA Security Module, FTD Virtual (FTDv).
Cisco Bug IDs: CSCve61540, CSCvh23085, CSCvh95456.

This plugin only works with Tenable.ot.
Please visit https://www.tenable.com/products/tenable-ot for more information.

Solution

The following text was originally created by the Cybersecurity and Infrastructure Security Agency (CISA). The original can be found at CISA.gov.

Rockwell Automation will inform users of updated firmware as soon as it is available. Rockwell Automation recommends that users using affected devices apply the following risk mitigation strategies:

- CVE-2018-0228 — The ASA and FTD configuration commands—set connection per-client-embryonic-max (TCP) and set connection per-client-max (TCP, UDP, and Stream Control Transmission Protocol [SCTP])—can be configured to limit the number of connection requests allowed. Using these configuration parameters can reduce the number of connections and greatly reduce the impact of the DoS attack.
- CVE-2018-0227 — No workarounds available
- CVE-2018-0231 — No workarounds available
- CVE-2018-0240 — No workarounds available
- CVE-2018-0296 — Cisco has released Snort Rule 46897

For additional information please see the Rockwell Automation security notification at (login required):
https://rockwellautomation.custhelp.com/app/answers/detail/a_id/1073860

Additionally the Cisco advisories can be found at the following links:

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-asa2

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-asa1

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-asa3

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-asa_inspect

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180606-asaftd

Plugin Details

Severity: High

ID: 506189

File Name: tenable_ot_cisco_CVE-2018-0240.nasl

Version: 1.2

Type: Remote

Family: Tenable.ot

Published: 10/6/2026

Updated: 10/6/2026

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Low

Score: 3.3

Percentile: 50.87

CVSS v2

Risk Factor: High

Base Score: 7.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C

CVSS Score Source: CVE-2018-0240

CVSS v3

Risk Factor: High

Base Score: 8.6

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Vulnerability Information

CPE: cpe:/o:cisco:adaptive_security_appliance_software:9

Required KB Items: Tenable.ot/Cisco

Patch Publication Date: 4/19/2018

Vulnerability Publication Date: 4/19/2018

Reference Information

CVE: CVE-2018-0240

CWE: 399

Detections

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