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Critical Vulnerabilities Found in Mitsubishi HMI Tool

ICS-CERT and Trend Micro’s Zero Day Initiative (ZDI) have disclosed the details of several critical vulnerabilities affecting Mitsubishi Electric’s E-Designer, a tool used for programming E1000 human-machine interfaces (HMIs).

ICS-CERT and Trend Micro’s Zero Day Initiative (ZDI) have disclosed the details of several critical vulnerabilities affecting Mitsubishi Electric’s E-Designer, a tool used for programming E1000 human-machine interfaces (HMIs).

Security researcher Andrea Micalizzi, also known as “rgod,” discovered that version 7.52 Build 344 of E-Designer is affected by several vulnerabilities that can be exploited for remote code execution and denial-of-service (DoS) attacks.

The expert identified three types of flaws: stack-based buffer overflows (CVE-2017-9638), heap-based buffer overflows (CVE-2017-9636) and out-of-bounds write bugs (CVE-2017-9634).

Micalizzi found a total of six stack buffer overflows and five heap buffer overflows affecting various components initialized during the processing of a driver configuration file.

The problem is that the process fails to properly validate the length of user-supplied data prior to copying it to a fixed-length buffer, allowing an attacker to execute arbitrary code in the context of the administrator. For the attack to work, the hacker needs to convince the targeted user to open a malicious file or web page.

The two out-of-bounds write flaws found by the researcher are caused due to the way certain sections of a project specification file (.mpa) are processed. These weaknesses can also lead to remote code execution.

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ZDI has published separate advisories for each of the 13 security holes. All the vulnerabilities have been rated critical based on CVSS scores that exceed 9.

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According to ZDI, the flaws were reported to Mitsubishi in late May 2016, but advisories were only made public this month.

The vendor has not released patches for E-Designer as the product has been discontinued. Instead, it has advised customers to replace E-Designer HMIs with interfaces created with the company’s new product, GT Works, or use E-Designer in a secure network that is behind a firewall.

ICS-CERT recommends placing control systems behind firewalls and isolating them from the business network, and using VPNs when remote access is required.

Related: Security Firm Discloses Unpatched Flaws in Schneider HMI Product

Related: Average Patching Time for SCADA Flaws Is 150 Days

Related: Schneider Electric Patches Flaws in Modicon, Wonderware Products

Written By

Eduard Kovacs (@EduardKovacs) is a managing 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.

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