Recommended mitigations for other water suppliers offered by Mass. In addition, the computers were connected to the internet without firewall protection, and "all computers used by water plant personnel were connected to the SCADA system and used the 32-bit version of the Windows 7 operating system," the advisory, which first reported by Ars Technica on Wednesday, read. It's unclear if the threat actor obtained the single password and used it to access TeamViewer. The Massachusetts cybersecurity advisory, posted to help local water suppliers guard against similar cyber attacks, stated that several computers in the Oldsmar plant had TeamViewer installed and all of those computers shared the same password for remote access. An unknown threat actor last Friday gained control of a SCADA system inside the Oldsmar plant via TeamViewer and attempted to remotely raise the amount of sodium hydroxide in the water to dangerous levels, though a plant operator stopped the attack.
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