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AUSCERT External Security Bulletin Redistribution
ESB-2018.1709
Advisory (ICSA-18-158-01) Rockwell Automation RSLinx Classic
and FactoryTalk Linx Gateway
8 June 2018
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AusCERT Security Bulletin Summary
---------------------------------
Product: Rockwell Automation RSLinx Classic
Rockwell Automation FactoryTalk Linx Gateway
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Increased Privileges -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2018-10619
Original Bulletin:
https://ics-cert.us-cert.gov/advisories/ICSA-18-158-01
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Advisory (ICSA-18-158-01)
Rockwell Automation RSLinx Classic and FactoryTalk Linx Gateway
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
CVSS v3 8.8 ATTENTION: Low skill level to exploit Vendor: Rockwell
Automation Equipment: RSLinx Classic and FactoryTalk Linx Gateway
Vulnerability: Unquoted Search Path or Element
2. RISK EVALUATION
Successful exploitation of this vulnerability could allow an authorized, but
non-privileged local user to execute arbitrary code and allow a threat actor to
escalate user privileges on the affected workstation.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of RSLinx Classic, a software platform that allows
Logix5000 Programmable Automation Controllers to connect to a wide variety of
Rockwell Software applications, and FactoryTalk Linx Gateway, software that
provides an Open Platform Communications (OPC) Unified Architecture (UA) server
interface to allow the delivery of information from Rockwell Software
applications to Allen-Bradley controllers, are affected:
RSLinx Classic Versions 3.90.01 and prior, and FactoryTalk Linx Gateway
Versions 3.90.00 and prior.
3.2 VULNERABILITY OVERVIEW
3.2.1 UNQUOTED SEARCH PATH OR ELEMENT CWE-428
An unquoted search path or element may allow an authorized, but non-privileged
local user to execute arbitrary code and allow a threat actor to escalate user
privileges on the affected workstation.
CVE-2018-10619 has been assigned to this vulnerability. A CVSS v3 base score of
8.8 has been calculated; the CVSS vector string is
(AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H).
3.3 BACKGROUND
CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing, Energy, Water and
Wastewater Systems
COUNTRIES/AREAS DEPLOYED: Worldwide
COMPANY HEADQUARTERS LOCATION: Wisconsin, USA
3.4 RESEARCHER
Gjoko Krstic of Zero Science Lab reported this vulnerability to Rockwell
Automation, and Rockwell Automation reported it to the NCCIC.
4. MITIGATIONS
Rockwell Automation recommends all users update to the following RSLinx Classic
and FactoryTalk Linx Gateway versions:
RSLinx Classic Versions 3.90.01 and prior, update to v4.00.01 or later
available at:
https://compatibility.rockwellautomation.com/Pages/MultiProductDownload.aspx?crumb=112
FactoryTalk Linx Gateway Versions 3.90.00 and prior, update to FactoryTalk
Linx Gateway v6.00.00 or later available at:
https://compatibility.rockwellautomation.com/Pages/MultiProductDownload.aspx?crumb=112
Rockwell also recommends the following mitigating procedures to those who are
unable to upgrade to the latest version:
Visit Knowledge Base Article ID 939382, which describes how to identify
whether or not the service path contains spaces (i.e., is vulnerable); how
to manually address this vulnerability through a registry edit; and
describes the process of implementing these edits.
https://rockwellautomation.custhelp.com/app/answers/detail/a_id/939382 (login
required).
Run all software as a user, not as an administrator, to minimize the impact
of malicious code on the infected system.
Use Microsoft AppLocker or other similar whitelisting application to help
mitigate risk. Information on using AppLocker with Rockwell Automation
products is available at:
https://rockwellautomation.custhelp.com/app/answers/detail/a_id/546989 (login
required).
Ensure the least-privilege user principle is followed, and user/service
account access to shared resources (such as a database) is only granted with
a minimum amount of rights as needed.
For more information, please see Rockwell Automation's knowledgebase advisory
number 1073800 on this issue at the following location:
https://rockwellautomation.custhelp.com/app/answers/detail/a_id/1073800 (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
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. This
vulnerability is not exploitable remotely.
Contact Information
For any questions related to this report, please contact the NCCIC at:
Email: NCCICCUSTOMERSERVICE@hq.dhs.gov Toll Free: 1-888-282-0870
For industrial control systems cybersecurity information:
http://ics-cert.us-cert.gov 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 product.
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