The U.S. Cybersecurity and Infrastructure Security Agency (CISA) this week released an advisory to inform industrial organizations that some SCADA/HMI products made by Japanese electrical equipment company Fuji Electric are affected by potentially serious vulnerabilities.
The impacted products are Tellus Lite V-Simulator and V-Server Lite. Telus and V-Server SCADA/HMI products are designed to help users monitor and operate their plants, including remote locations. CISA says the products are used worldwide, particularly in the critical manufacturing sector.
The vulnerabilities, reported to Fuji Electric by various researchers through Trend Micro’s Zero Day Initiative (ZDI) and CISA, have been described as buffer overflow, out-of-bounds read/write and uninitialized pointer issues that can be exploited for arbitrary code execution. An attacker could exploit the vulnerabilities by tricking the targeted user into opening a malicious project file.
According to CISA, the vulnerabilities affect Tellus Lite V-Simulator and V-Server Lite versions prior to 22.214.171.124, which should patch the flaws. This update was apparently released in October 2020.
It’s worth noting that ZDI published advisories for some of these vulnerabilities in September 2020, after the vendor failed to release patches within a 120-day deadline. The advisories were published at the time with a “0day” status. ZDI will likely soon also make public the advisories describing the remaining vulnerabilities.
The public ZDI advisories reveal that the vulnerabilities are caused by “the lack of proper validation of user-supplied data,” which results in memory corruption, and can ultimately lead to remote code execution.