A number of Vital Flaws Found in Honeywell Experion PKS and ACE Controllers

The U.S. Cybersecurity and Infrastructure Safety Company (CISA) on Tuesday launched an advisory relating to a number of safety vulnerabilities affecting all variations of Honeywell Experion Course of Data System C200, C200E, C300, and ACE controllers that could possibly be exploited to attain distant code execution and denial-of-service (DoS) circumstances.

“A Management Element Library (CCL) could also be modified by a nasty actor and loaded to a controller such that malicious code is executed by the controller,” Honeywell famous in an impartial safety notification revealed earlier this February. Credited with discovering and reporting the issues are Rei Henigman and Nadav Erez of commercial cybersecurity agency Claroty.

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Experion Course of Data System (PKS) is a distributed management system (DCS) that is designed to regulate massive industrial processes spanning quite a lot of sectors starting from petrochemical refineries to nuclear energy crops the place excessive reliability and safety is necessary.

The listing of three flaws is as follows –

  • CVE-2021-38397 (CVSS rating: 10.0) – Unrestricted Add of File with Harmful Sort
  • CVE-2021-38395 (CVSS rating: 9.1) – Improper Neutralization of Particular Parts in Output Utilized by a Downstream Element
  • CVE-2021-38399 (CVSS rating: 7.5) – Relative Path Traversal

In line with Claroty, the problems hinge on the obtain code process that is important to program the logic working within the controller, thus enabling an attacker to imitate the method and add arbitrary CLL binary information. “The machine then masses the executables with out performing checks or sanitization, giving an attacker the power to add executables and run unauthorized native code remotely with out authentication,” researchers Henigman and Erez stated.

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In a nutshell, profitable exploitation of the shortcomings may allow a malicious occasion to entry unauthorized information and directories, and worse, remotely execute arbitrary code and trigger a denial-of-service situation. To stop loading a modified CCL with malicious code to a controller, Honeywell has included extra safety enhancements by cryptographically signing every CCL binary that is validated previous to its use.

Customers are urged to replace or patch as quickly as attainable in an effort to mitigate these vulnerabilities absolutely.

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