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CVE-2020-12526— BECKHOFF: DoS-Vulnerability for TwinCAT OPC UA Server and IPC Diagnostics UA Server

Quick assessment

Affected
Beckhoff TwinCAT OPC UA Server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Honeywell OPC UA Tunneller是美国Honeywell公司的一个可为跨设备、跨域之间提供可靠OPC UA连接的应用软件 Honeywell OPC UA Tunneller 存在安全漏洞。攻击者可以利用该漏洞使程序拒绝服务。以下产品及版本受到影响：TwinCAT OPC UA Server in versions up to 2.3.0.12 and IPC Diagnostics UA Server in versions up to 3.1.0。

CVSS 5.3 · Medium EPSS 0.95% · P60

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2020-12526

Vulnerability Information
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Vulnerability Title
BECKHOFF: DoS-Vulnerability for TwinCAT OPC UA Server and IPC Diagnostics UA Server
Source: CVE Program / CVE List V5
Vulnerability Description
TwinCAT OPC UA Server in versions up to 2.3.0.12 and IPC Diagnostics UA Server in versions up to 3.1.0.1 from Beckhoff Automation GmbH & Co. KG are vulnerable to denial of service attacks. The attacker needs to send several specifically crafted requests to the running OPC UA server. After some of these requests the OPC UA server is no longer responsive to any client. This is without effect to the real-time functionality of IPCs.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Honeywell OPC UA Tunneller 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Honeywell OPC UA Tunneller是美国Honeywell公司的一个可为跨设备、跨域之间提供可靠OPC UA连接的应用软件 Honeywell OPC UA Tunneller 存在安全漏洞。攻击者可以利用该漏洞使程序拒绝服务。以下产品及版本受到影响：TwinCAT OPC UA Server in versions up to 2.3.0.12 and IPC Diagnostics UA Server in versions up to 3.1.0。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Beckhoff TwinCAT OPC UA Server unspecified ~ 2.3.0.12 -
Beckhoff IPC Diagnostics UA Server unspecified ~ 3.1.0.1 -
Beckhoff TF6100 unspecified ~ 3.3.18 -

II. Public POCs for CVE-2020-12526

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III. Intelligence Information for CVE-2020-12526

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Other References for CVE-2020-12526 (1)

Other References for CVE-2020-12526 (1)

IV. Related Vulnerabilities

Same product: TwinCAT OPC UA Server
Same vendor: Beckhoff
Same weakness: CWE-20

V. Comments for CVE-2020-12526

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