Multiple Critical Flaws Discovered in Honeywell Experion PKS and ACE Controllers

The U.S. Cybersecurity and Infrastructure Protection Agency (CISA) on Tuesday introduced an advisory regarding several stability vulnerabilities affecting all variations of Honeywell Experion Approach Understanding Program C200, C200E, C300, and ACE controllers that could be exploited to achieve remote code execution and denial-of-company (DoS) circumstances.

“A Control Part Library (CCL) may well be modified by a poor actor and loaded to a controller these types of that destructive code is executed by the controller,” Honeywell noted in an unbiased security notification revealed before this February. Credited with finding and reporting the flaws are Rei Henigman and Nadav Erez of industrial cybersecurity company Claroty.

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Experion Process Knowledge Procedure (PKS) is a dispersed manage technique (DCS) which is intended to handle large industrial processes spanning a wide range of sectors ranging from petrochemical refineries to nuclear energy crops where by substantial trustworthiness and security is significant.

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The checklist of a few flaws is as follows –

  • CVE-2021-38397 (CVSS rating: 10.) – Unrestricted Upload of File with Risky Style
  • CVE-2021-38395 (CVSS score: 9.1) – Poor Neutralization of Particular Features in Output Utilized by a Downstream Part
  • CVE-2021-38399 (CVSS score: 7.5) – Relative Path Traversal

In accordance to Claroty, the difficulties hinge on the obtain code process that is important to software the logic jogging in the controller, consequently enabling an attacker to mimic the method and add arbitrary CLL binary documents. “The unit then masses the executables with no executing checks or sanitization, giving an attacker the ability to upload executables and run unauthorized native code remotely without authentication,” scientists Henigman and Erez explained.

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In a nutshell, thriving exploitation of the shortcomings could permit a malicious party to access unauthorized information and directories, and worse, remotely execute arbitrary code and bring about a denial-of-services condition. To reduce loading a modified CCL with destructive code to a controller, Honeywell has incorporated further protection enhancements by cryptographically signing each CCL binary which is validated prior to its use.

End users are urged to update or patch as before long as feasible in order to mitigate these vulnerabilities completely.

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