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The U.S. Cybersecurity and Infrastructure Security Agency (CISA) last week published an industrial control system (ICS) advisory related to multiple vulnerabilities impacting Schneider Electric’s Easergy medium voltage protection relays.

“Successful exploitation of these vulnerabilities may disclose device credentials, cause a denial-of-service condition, device reboot, or allow an attacker to gain full control of the relay,” the agency said in a bulletin on February 24, 2022. “This could result in loss of protection to your electrical network.”

The two high-severity weaknesses impact Easergy P3 versions prior to v30.205 and Easergy P5 versions before v01.401.101. Details of the flaws are as follows –

  • CVE-2022-22722 (CVSS score: 7.5) – Use of hardcoded credentials that could be abused to observe and manipulate traffic associated with the device.
  • CVE-2022-22723 and CVE-2022-22725 (CVSS score: 8.8) – A buffer overflow vulnerability that could result in program crashes and execution of arbitrary code by sending specially crafted packets to the relay over the network.

The flaws, which were discovered and reported by researchers Timothée Chauvin, Paul Noalhyt, Yuanshe Wu at Red Balloon Security, were addressed by Schneider Electric as part of updates pushed on January 11, 2022.

images from Hacker News