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AUSCERT External Security Bulletin Redistribution
A vulnerability has been identified in Rockwell Automation
EtherNet/IP Web Server Modules
6 February 2019
AusCERT Security Bulletin Summary
Product: Rockwell Automation EtherNet/IP Web Server
Operating System: Network Appliance
Impact/Access: Denial of Service -- Remote/Unauthenticated
CVE Names: CVE-2018-19016
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Rockwell Automation EtherNet/IP Web Server Modules
Original release date: February 05, 2019
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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,
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
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
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
CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
COUNTRIES/AREAS DEPLOYED: Worldwide
COMPANY HEADQUARTERS LOCATION: France
Rockwell Automation working with Tenable reported this vulnerability to NCCIC.
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):
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
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.
For any questions related to this report, please contact the NCCIC at:
Toll Free: 1-888-282-0870
For industrial control systems cybersecurity information:
or incident reporting: https://ics-cert.us-cert.gov/Report-Incident?
The NCCIC continuously strives to improve its products and services. You can
help by choosing one of the links below to provide feedback about this
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