ICS Patch Tuesday: Siemens, Schneider Fix Several Critical Vulnerabilities


Siemens and Schneider Electric have addressed more than two dozen vulnerabilities in their April 2022 Patch Tuesday security advisories, including flaws that have a “critical” severity rating.

Schneider Electric has only released two advisories and each covers only one vulnerability, but the weaknesses appear to be serious.

The industrial giant has patched a critical remote code execution vulnerability in the IGSS (Interactive Graphical SCADA System) product. The flaw, patched with the release of a new version, has been described as a stack-based buffer overflow that can be exploited by sending specially crafted messages to the targeted system.

The second advisory describes a high-severity denial-of-service (DoS) vulnerability affecting Schneider’s Modicon M340 controllers, as well as the communication modules for these devices. Exploitation involves sending specially crafted requests to the targeted controller.

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Siemens released 11 new advisories on Tuesday, including two that describe critical vulnerabilities. One of them covers three flaws affecting the SIMATIC Energy Manager product, including a deserialization-related issue that can be exploited by an unauthenticated attacker to execute code with elevated privileges.

Another advisory describes eight critical and high-severity bugs affecting SCALANCE X switches. The flaws, many of which can be exploited remotely and without authentication, can be used to crash devices, obtain sensitive information, and execute arbitrary code.

Siemens has also addressed high-severity vulnerabilities in Simcenter Femap, SIMATIC PCS neo, SIMATIC S7-400, and SCALANCE W1700. Many of these security holes can be exploited for DoS attacks.

It’s worth noting that DoS vulnerabilities can have a significant impact in the case of industrial systems, as their exploitation can lead to costly or damaging disruptions.

Medium-severity issues have been patched or mitigated by Siemens in SIMATIC, Mendix, and SICAM products.

Related: ICS Patch Tuesday: Siemens, Schneider Electric Address Nearly 50 Vulnerabilities

Related: Siemens Addresses Over 90 Vulnerabilities Affecting Third-Party Components

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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.

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