Rockwell Automation has an update to mitigate an unquoted search path or element vulnerability in its RSLinx Classic and FactoryTalk Linx Gateway, according to a report with NCCIC.
Successful exploitation of this vulnerability, discovered by Gjoko Krstic of Zero Science Lab, could allow an authorized, but non-privileged local user to execute arbitrary code and allow an attacker to escalate user privileges on the affected workstation.
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, suffer from the issue:
• RSLinx Classic Versions 3.90.01 and prior
• FactoryTalk Linx Gateway Versions 3.90.00 and prior
In the vulnerability, 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 is the case number assigned to this vulnerability, which has a CVSS v3 base score of 8.8.
The products see use mainly in the critical manufacturing, energy, and water and wastewater systems sectors. They also see action on a global basis.
No known public exploits specifically target this vulnerability. This vulnerability is not exploitable remotely. However, an attacker with low skill level could leverage the vulnerability.
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
• FactoryTalk Linx Gateway Versions 3.90.00 and prior, update to FactoryTalk Linx Gateway v6.00.00 or later.
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 (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. Click here for information on using AppLocker with Rockwell Automation products (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 173800 on this issue (login required).