(Pwn2Own) Unified Automation OPC UA C++ Improper Update of Reference Count Denial-of-Service Vulnerability

July 28th, 2022
ZDI-22-1030 ZDI-CAN-16927

CVE ID

CVE-2022-37012

CVSS Score

7.5 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Vendors

Unified Automation

Affected Products

OPC UA C++ Demo Server

Vulnerability Details

This vulnerability allows remote attackers to create a denial-of-service condition on affected installations of Unified Automation OPC UA C++ Demo Server. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the OpcUa_SecureListener_ProcessSessionCallRequest method. A crafted OPC UA message can force the server to incorrectly update a reference count. An attacker can leverage this vulnerability to create a denial-of-service condition on the system.

Additional Details

Unified Automation has issued an update to correct this vulnerability. More details can be found at:
https://documentation.unified-automation.com/uasdkcpp/1.7.7/CHANGELOG.txt

Disclosure Timeline

  • 2022-05-09 - Vulnerability reported to vendor
  • 2022-07-28 - Coordinated public release of advisory
  • 2022-07-28 - Advisory Updated

Credit

20urdjk

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