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