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             AUSCERT External Security Bulletin Redistribution

                               ESB-2019.1046
                Rockwell Automation PowerFlex 525 AC Drives
                               29 March 2019

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Rockwell Automation PowerFlex 525 AC Drives
Publisher:         ICS-CERT
Operating System:  Network Appliance
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-19282  

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-19-087-01

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Advisory (ICSA-19-087-01)

Rockwell Automation PowerFlex 525 AC Drives

Original release date: March 28, 2019

Legal Notice

All information products included in http://ics-cert.us-cert.gov are
provided"as is" for informational purposes only. The Department of Homeland
Security (DHS) does not provide any warranties of any kind regarding any
information contained within. DHS does not endorse any commercial product or
service, referenced in this product or otherwise. Further dissemination of this
product is governed by the Traffic Light Protocol (TLP) marking in the header.
For more information about TLP, see http://www.us-cert.gov/tlp/ .

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
    and earlier.

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/
C:N/I:N/A:H ).

3.3 BACKGROUND

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

3.4 RESEARCHER

Nicolas Merle of Applied Risk reported this vulnerability to Rockwell
Automation.

4. MITIGATIONS

Rockwell Automation has released new firmware to address the vulnerability.
Download the latest version of the firmware from:

https://compatibility.rockwellautomation.com/Pages/MultiProductDownload.aspx
Keyword=25B&crumb=112

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
    network.
  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
(login required):
https://rockwellautomation.custhelp.com/app/answers/detail/a_id/1082684

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.

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