CVE-2021-32994 – OPC UA C++ SDK is vulnerable to a denial of service 17th June, 2021

Preface: OPC UA Stack is not only vulnerable but also has a range of significant fundamental problems.

Background: The UA SDK is a C++ library that supports you in writing portable C++ OPC UA Servers and Clients. The UA SDK actually consists of two SDKs, a Server SDK and a Client SDK. Both use the same UA Base Library which does all the C++ encapsulation of the raw ANSI C types
that are defined in the OPC UA Communication Stack by the OPC Foundation.

Vulnerability details: OPC UA C++ SDK is vulnerable to a denial of service, caused by improper restriction of operations within
the bounds of a memory buffer. A remote attacker could exploit this vulnerability to cause the system to crash.

In the OPC UA Stack. OPC Foundation developers provide libraries that are essentially a set of exported functions based on a specification, similar to an API.
In this vulnerability, the exported library functions don’t properly validate received extension objects, which may allow an attacker to crash the software by sending a variety of specially crafted packets to access several unexpected memory locations.

Remedy: Click here to download the latest software package from the Softing website.

ICS Advisory (ICSA-21-168-02) –

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