Security Experts:

Rockwell Controller Flaw Allows Hackers to Redirect Users to Malicious Sites

A serious vulnerability affecting some of Rockwell Automation’s MicroLogix and CompactLogix programmable logic controllers (PLCs) can be exploited by a remote attacker to redirect users to malicious websites.

According to advisories published by ICS-CERT and Rockwell Automation, the flaw, tracked as CVE-2019-10955 and assigned a CVSS score of 7.1 (high severity), impacts MicroLogix 1100 and 1400, and CompactLogix 5370 (L1, L2 and L3) controllers.

Rockwell patches open redirect vulnerability in PLCThe issue, described by ICS-CERT as an open redirect vulnerability, is related to the web server running on these devices. This web server accepts user input from the PLCs web interface and a remote, unauthenticated attacker can inject a malicious link that redirects users from the controller’s web server to an arbitrary site.

“This malicious website could potentially run or download arbitrary malware on the user’s machine. The target of this type of attack is not the industrial control device and does not disrupt its control functionality,” Rockwell noted in its advisory (only available to registered users).

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The vendor has released firmware updates for the affected controllers that should patch the vulnerability. Organizations that cannot install the updates have been advised to disable the web server and implement general security measures in order to prevent potential attacks.

Researchers Josiah Bryan and Geancarlo Palavicini have been credited for reporting the vulnerability to Rockwell Automation.

Related: Severe Vulnerabilities Expose MicroLogix PLCs to Attacks

Related: Rockwell Automation Patches Serious Flaw in MicroLogix 1400 PLC

Related: Vulnerability Exposes Rockwell Controllers to DoS Attacks

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Eduard Kovacs (@EduardKovacs) is a contributing editor at SecurityWeek. He worked as a high school IT teacher for two years before starting a career in journalism as Softpedia’s security news reporter. Eduard holds a bachelor’s degree in industrial informatics and a master’s degree in computer techniques applied in electrical engineering.