CVE-2023-32170 Unified Automation UaGateway OPC UA Server Improper Input Validation Denial-of-Service Vulnerability

Medium 6.5 Published 3 May 2024 Updated 2 Aug 2024

Remote attackers can cause a denial-of-service condition in Unified Automation UaGateway by exploiting improper input validation in client certificate processing.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2023-32170?

CVE-2023-32170 is a medium-severity denial of service vulnerability in Unified Automation UaGateway, published on 3 May 2024. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

Unified Automation UaGateway OPC UA Server Improper Input Validation Denial-of-Service Vulnerability. This vulnerability allows remote attackers to create a denial-of-service condition on affected installations of Unified Automation UaGateway. User interaction is required to exploit this vulnerability in that the target must choose to accept a client certificate.

The specific flaw exists within the processing of client certificates. The issue results from the lack of proper validation of certificate data. An attacker can leverage this vulnerability to create a denial-of-service condition on the system. Was ZDI-CAN-20494.

Weakness: CWE-20

Which versions are affected by CVE-2023-32170?

It affects 1 product.

Products include Unified-Automation Uagateway.

How do I fix CVE-2023-32170?

No fix has been published for CVE-2023-32170 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2023-32170 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-32170 exists.

Sources

Also known as GHSA-c297-7j33-x4q3.