Vulnerability identifier: #VU49106

Vulnerability risk: High

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-27263

CWE-ID: CWE-122

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
KEPServerEX
Server applications / SCADA systems
ThingWorx Kepware Server
Server applications / SCADA systems
ThingWorx Industrial Connectivity
Server applications / SCADA systems
OPC-Aggregator
Server applications / SCADA systems

Vendor: Kepware

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error when processing OPC UA messages. A remote attacker can send specially crafted OPC UA message, trick the victim into opening it, trigger heap-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

KEPServerEX: 6.0 - 6.9

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External links
http://ics-cert.us-cert.gov/advisories/icsa-20-352-02

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.