Siemens Updating Fixes for OpenSSL Hole

Tuesday, August 14, 2018 @ 02:08 PM gHale

Siemens released updates for a vulnerability in OpenSSL that affected multiple products and is working on updates for others, according to a report with Siemens ProductCERT.

In OpenSSL 1.0.2 there is an “error state” mechanism. This “error state” mechanism does not work correctly if SSL_read() or SSL_write() is called directly by an application, which could result in data being sent out unencrypted by the SSL/TLS record layer.

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The vulnerability affects the following products:
• MindConnect IoT2040: All versions less than V03.01
• MindConnect Nano (IPC227D): All versions less than V03.01
• SIMATIC ET 200SP Open Controller CPU 1515SP PC (OC1): All versions less than V2.1
• SIMATIC HMI WinCC Flexible: All versions
• SIMATIC IPC DiagBase: All versions
• SIMATIC IPC DiagMonitor: All versions
• SIMATIC S7-1200: All versions
• SIMATIC S7-1500: All versions less than V2.5.2
• SIMATIC S7-1500 Software Controller: All versions
• SIMATIC STEP 7 (TIA Portal): All versions less than V15 Update 2
• SIMATIC WinCC (TIA Portal): All versions less than V15 Update 2
• SIMATIC WinCC OA V3.14: All versions
• SIMATIC WinCC OA V3.15: All versions
• SIMATIC WinCC OA V3.16: All versions
• SINUMERIK Integrate Access MyMachine ser- vice engineer client as part of Sinumerik Integrate Product suite: All versions from V4.1.7 and below
• SINUMERIK Integrate Operate Client as part of Sinumerik Integrate Product suite: All versions from 2.0.11 / 3.0.11 and below

SIMATIC STEP 7 (TIA Portal) is an engineering software to configure and program SIMATIC controllers.

SIMATIC WinCC (TIA Portal) is an engineering software to configure and program SIMATIC Panels, SIMATIC Industrial PCs, and Standard PCs running WinCC Runtime Advanced or SCADA System WinCC Runtime Professional visualization software.

Products of the Siemens SIMATIC S7-1500 CPU family have been designed for discrete and continuous control in industrial environments such as manufacturing, food and beverages, and chemical industries worldwide.

Products of the Siemens SIMATIC S7-1200 CPU family have been designed for discrete and continuous control in industrial environments such as manufacturing, food and beverages, and chemical industries worldwide.

The client-server HMI (human machine interface) system SIMATIC WinCC Open Architecture (OA) is part of the SIMATIC HMI family. It is designed for use in applications requiring a high degree of customer- specific adaptability, large or complex applications and projects that impose specific system requirements or functions.

SINUMERIK Integrate product suite facilitates simple networking of machine tools in the IT of the production landscape.

SIMATIC S7-1500 Software Controller is a SIMATIC software controller for PC-based automation solutions.

MindConnect Nano is a Device for data acquisition via different protocols and permits the transfer of this data to MindSphere.

SIMATIC WinCC flexible panels and runtime systems are used for process visualization and control operations.

SIMATIC IPC DiagBase diagnostics software allows to recognize early on any potential faults on SIMATIC IPCs and helps to avoid or reduce system downtimes.

SIMATIC IPC DiagMonitor monitors, reports, visualizes and logs the system states of the SIMATIC IPCs. It communicates with other systems and reacts when events occur.

In OpenSSL 1.0.2 an “error state” mechanism was introduced. This “error state” mechanism does not work correctly if SSL_read() or SSL_write() is called directly by an application. This could result in data being sent out unencrypted by the SSL/TLS record layer.

Successful exploitation requires an attacker to cause a fatal error in the victim’s SSL/TLS handshake algorithm, and the targeted application calls SSL_read() or SSL_write() after having already received a fatal error. No user interaction or privileges are required to exploit this security vulnerability. The vulnerability could allow to compromise confidentiality of data by transmitting it unencrypted over the network.

The vulnerability has a CVSS base score 5.9. There are no public exploits at this time.

The following are mitigations for the various products:

• MindConnect IoT2040: All versions less than V03.01: Install V03.01 or newer via Mindsphere web front end
• MindConnect Nano (IPC227D): All versions less than V03.01: Install V03.01 or newer via Mindsphere web front end
• SIMATIC ET 200SP Open Controller CPU 1515SP PC (OC1): All versions less than V2.1: See recommendations from Workarounds and Mitigations
• SIMATIC HMI WinCC Flexible: All versions: See recommendations from Workarounds and Mitigations
• SIMATIC IPC DiagBase: All versions: See recommendations from Workarounds and Mitigations
• SIMATIC IPC DiagMonitor: All versions: See recommendations from Workarounds and Mitigations
• SIMATIC S7-1200: All versions: See recommendations from Workarounds and Mitigations
• SIMATIC S7-1500: All versions less than V2.5.2: Update to V2.5.2
• SIMATIC S7-1500 Software Controller: All versions: See recommendations from Workarounds and Mitigations
• SIMATIC STEP 7 (TIA Portal): All versions less than V15 Update 2: Update to V15 Update 2 or newer
• SIMATIC WinCC (TIA Portal): All versions less than V15 Update 2: Update to V15 Update 2 or newer
• SIMATIC WinCC OA V3.14: All versions: See recommendations from Workarounds and Mitigations
• SIMATIC WinCC OA V3.15: All versions: See recommendations from Workarounds and Mitigations
• SIMATIC WinCC OA V3.16: All versions: See recommendations from Workarounds and Mitigations
• SINUMERIK Integrate Access MyMachine ser- vice engineer client as part of Sinumerik Integrate Product suite: All versions from V4.1.7 and below: Update to V4.1.8, installing latest Sinumerik Inte- grate Product suite. The update can be obtained from your local service organization. If assistance in identify- ing your local service organization is required, please contact a local Siemens hotline center.
• SINUMERIK Integrate Operate Client as part of Sinumerik Integrate Product suite: All versions from 2.0.11 / 3.0.11 and below: Update to V2.0.12 / 3.0.12, installing latest Sinumerik Integrate Product suite. The update can be obtained from your local service organization. If assistance in identifying your local service organization is required, please contact a local Siemens hotline center.

In addition, Siemens identified the following specific workarounds and mitigations that customers can apply to reduce the risk:
• S7-1200: Disable web server within the device configuration if it is not used or limit access to the web server on a particular Ethernet/PROFINET port/interface if possible (setting is under General / Web server access).
• For all other affected products, limit network access using appropriate mechanisms

Siemens recommends to protect network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends to configure the environment according to Siemens’ operational guidelines for Industrial Security.

Click here for additional information on Industrial Security by Siemens.



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