Use-after-free in Kepware products - CVE-2020-27267

Vulnerability identifier: #VU49107

CSH Severity: Medium

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2020-27267

CWE-ID: CWE-416

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a use-after-free error. A remote attacker can create and close OPC UA connections at a high rate that may cause a server to crash.

KEPServerEX
ThingWorx Kepware Server
OPC-Aggregator
ThingWorx Industrial Connectivity

Install updates from vendor's website.

KEPServerEX - addressed in versions 6.6.362.0, 6.7.1067.0, 6.8.838.0, 6.9.584.0
ThingWorx Kepware Server - addressed in versions 6.8.839.0, 6.9.584.0
OPC-Aggregator - update to 6.9.584.0
ThingWorx Industrial Connectivity - addressed in versions 8.4 (6.6.362.0), 8.5 (6.7.1068.0)

• https://ics-cert.us-cert.gov/advisories/icsa-20-352-02

• Multiple vulnerabilities in PTC Kepware products