(Pwn2Own) Unified Automation UaGateway OPC UA Server Null Pointer Dereference Denial-of-Service Vulnerability

May 31st, 2023
ZDI-23-776 ZDI-CAN-20495

CVE ID

CVE-2023-32171

CVSS Score

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

Affected Vendors

Unified Automation

Affected Products

UaGateway

Vulnerability Details

This vulnerability allows remote attackers to create a denial-of-service condition on affected installations of Unified Automation UaGateway. Authentication is required to exploit this vulnerability.

The specific flaw exists within the ImportCsv method. A crafted XML payload can cause a null pointer dereference. 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/uagateway/1.5.14/CHANGELOG.txt

Disclosure Timeline

  • 2023-02-22 - Vulnerability reported to vendor
  • 2023-05-31 - Coordinated public release of advisory

Credit

Axel '0vercl0k' Souchet of https://doar-e.github.io/

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