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AUSCERT External Security Bulletin Redistribution
Rockwell Automation PowerFlex 525 AC Drives
29 March 2019
AusCERT Security Bulletin Summary
Product: Rockwell Automation PowerFlex 525 AC Drives
Operating System: Network Appliance
Impact/Access: Denial of Service -- Remote/Unauthenticated
CVE Names: CVE-2018-19282
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Rockwell Automation PowerFlex 525 AC Drives
Original release date: March 28, 2019
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1. EXECUTIVE SUMMARY
o CVSS v3 7.5
o ATTENTION: Exploitable remotely/low skill level to exploit
o Vendor: Rockwell Automation
o Equipment: PowerFlex 525 AC Drives
o Vulnerability: Resource Exhaustion
2. RISK EVALUATION
Successful exploitation of this vulnerability could result in resource
exhaustion, denial of service, and/or memory corruption.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of PowerFlex 525, an AC drive, are affected:
o PowerFlex 525 AC Drives with embedded EtherNet/IP and Safety Versions 5.001
3.2 VULNERABILITY OVERVIEW
3.2.1 UNCONTROLLED RESOURCE CONSUMPTION ('RESOURCE EXHAUSTION') CWE-400
A remote, unauthenticated threat actor can repeatedly send specific CIP packets
to an affected PowerFlex 525 drive, which may allow disruption of the
availability of the device.
CVE-2018-19282 has been assigned to this vulnerability. A CVSS v3 base score of
7.5 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/
o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: United States
Nicolas Merle of Applied Risk reported this vulnerability to Rockwell
Rockwell Automation has released new firmware to address the vulnerability.
Download the latest version of the firmware from:
Rockwell Automation recommends the following general security guidelines:
o Utilize proper network infrastructure controls, such as firewalls, to help
ensure CIP messages from unauthorized sources are blocked.
o Block all traffic to EtherNet/IP or other CIP protocol-based devices from
outside the manufacturing zone by blocking or restricting access to TCP and
UDP Port 2222 and Port 44818, using proper network infrastructure controls,
such as firewalls, UTM devices, or other security appliances. For more
information on TCP/UDP ports used by Rockwell Automation Products, see
Knowledgebase Article ID 898270 (login required).
o If applicable, consult the product documentation for specific features,
such as a hardware key-switch setting, which may be used to block
unauthorized changes, etc.
o Use trusted software, software patches, antivirus/antimalware programs, and
interact only with trusted websites and attachments.
o Minimize network exposure for all control system devices and/or systems,
and ensure they are not accessible from the Internet or the business
o 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.
Rockwell Automation has released a security advisory regarding this
vulnerability, which can be found on its website at the following location
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.
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