Security Experts:

Delta Patches Vulnerabilities in HMI, PLC Products

Taiwan-based Delta Electronics has patched several vulnerabilities in two of the company’s industrial automation products, including flaws that can be exploited for remote code execution.

A researcher who uses the online moniker “Axt” informed Delta via Trend Micro’s Zero Day Initiative (ZDI) and ICS-CERT that its WPLSoft product, a programming software for programmable logic controllers (PLCs), is affected by several types of vulnerabilities.

ICS-CERT’s advisory describes three types of flaws that can allow arbitrary code execution in the context of the current process or denial-of-service (DoS) attacks, specifically stack-based buffer overflow, heap-based buffer overflow, and out-of-bounds write issues. The security holes have been rated high severity and they are tracked as CVE-2018-7494, CVE-2018-7507 and CVE-2018-7509.

ZDI has published a total of nine advisories, one for each variation of these flaws. According to the company, the vulnerabilities are related to how the application parses .dvp files and they can be exploited by getting the targeted user to open a specially crafted file or webpage.

ZDI said it reported the security holes to Delta via ICS-CERT in February 2017. The company’s advisories suggest that the vendor attempted to release some patches last summer, but they did not properly fix the vulnerabilities. ZDI published its advisories in August 2017 with a “0Day” status.

ICS-CERT reported this week that the vulnerabilities were patched by Delta with the release of WPLSoft V2.46.0, which according to the vendor’s site was made available on February 2.

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A separate advisory published this week by ICS-CERT describes a medium severity vulnerability found by researcher Ghirmay Desta in Delta’s DOPSoft human-machine interface (HMI) product.

The flaw, a stack-based buffer overflow, is related to the processing of .dop or .dpb files, and it can allow remote code execution. The issue affects DOPSoft 4.00.01 and prior, and it was patched with the release of version 4.00.04 on March 1.

This vulnerability was also reported to Delta via ZDI, but the company has yet to publish advisories. ZDI’s website shows a total of 17 upcoming advisories describing vulnerabilities found by Desta in the DOPSoft product in October 2017. Last year, the expert also found weaknesses in Delta’s PMSoft, a development tool for motion controllers.

ZDI was also recently informed by an anonymous researcher of four high severity flaws in an unnamed Delta product.

It’s not uncommon for ICS vendors to take hundreds of days to patch vulnerabilities. A report published last year by ZDI showed that the average patching time for SCADA flaws had been 150 days.

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Related: Schneider Electric Patches Critical Flaw in HMI Products

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Eduard Kovacs 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.