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 2. News & Events
 3. Cybersecurity Advisories
 4. ICS Advisory

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ICS Advisory


ROCKWELL AUTOMATION ETHERNET/IP WEB SERVER MODULES

Last Revised
February 19, 2019
Alert Code
ICSA-19-036-02



1. EXECUTIVE SUMMARY

 * CVSS v3 5.3
 * ATTENTION: Exploitable remotely/low skill level to exploit
 * Vendor: Rockwell Automation
 * Equipment: EtherNet/IP Web Server Modules
 * Vulnerability: Improper Input Validation


2. RISK EVALUATION

Successful exploitation of this vulnerability could allow a remote attacker to
deny communication with Simple Network Management Protocol (SNMP) service.


3. TECHNICAL DETAILS


3.1 AFFECTED PRODUCTS

The following versions of EtherNet/IP web server module, a web server module,
are affected:

 * 1756-EWEB (includes 1756-EWEBK) Version 5.001 and earlier, and
 * CompactLogix 1768-EWEB Version 2.005 and earlier.


3.2 VULNERABILITY OVERVIEW


3.2.1    IMPROPER INPUT VALIDATION CWE-20(LINK IS EXTERNAL)

A remote attacker could send a crafted UDP packet to the SNMP service causing a
denial-of-service condition to occur until the affected product is restarted.

CVE-2018-19016 has been assigned to this vulnerability. A CVSS v3 base score of
5.3 has been calculated; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)(link is external).


3.3 BACKGROUND

 * CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
 * COUNTRIES/AREAS DEPLOYED: Worldwide
 * COMPANY HEADQUARTERS LOCATION: United States


3.4 RESEARCHER

Rockwell Automation working with Tenable reported this vulnerability to NCCIC.


4. MITIGATIONS

Rockwell Automation recommends that affected users disable the SNMP service if
not in use. 

For more information please refer to the Rockwell Automation security advisory
at (login required):

https://rockwellautomation.custhelp.com/app/answers/detail/a_id/1084268(link is
external)

NCCIC recommends users take defensive measures to minimize the risk of
exploitation of this vulnerability. Specifically, users should:

 * Minimize network exposure for all control system devices and/or systems, and
   ensure that they are not accessible from the Internet.
 * Locate control system networks and remote devices behind firewalls, and
   isolate them from the business network.
 * When remote access is required, use secure methods, such as Virtual Private
   Networks (VPNs), recognizing that VPNs may have vulnerabilities and should be
   updated to the most current version available. Also recognize that VPN is
   only as secure as the connected devices.

NCCIC reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.NCCIC also provides a section
for control systems security recommended practices on the ICS-CERT web page.
Several recommended practices are available for reading and download, including
Improving Industrial Control Systems Cybersecurity with Defense-in-Depth
Strategies.

Additional mitigation guidance and recommended practices are publicly available
on the ICS-CERT website in the Technical Information Paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Strategies.Organizations observing any suspected malicious activity should
follow their established internal procedures and report their findings to NCCIC
for tracking and correlation against other incidents.

No known public exploits specifically target this vulnerability.


VENDOR

Rockwell Automation


PLEASE SHARE YOUR THOUGHTS

We recently updated our anonymous product survey; we’d welcome your feedback.


RELATED ADVISORIES

Jun 01, 2023
ICS Advisory | ICSA-23-152-01


ADVANTECH WEBACCESS/SCADA

Jun 01, 2023
ICS Advisory | ICSA-23-152-02


HID GLOBAL SAFE

May 30, 2023
ICS Advisory | ICSA-23-150-01


ADVANTECH WEBACCESS/SCADA

May 25, 2023
ICS Advisory | ICSA-23-145-01


MOXA MXSECURITY SERIES

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