Siemens Updates SIMATIC Vulnerability

Tuesday, May 3, 2016 @ 07:05 PM gHale


Siemens created firmware updates to mitigate an authentication bypass vulnerability first identified in December in its SIMATIC Communication Processor devices CP 343-1, TIM 3V-IE, TIM 4R-IE, and CP 443-1, according to a report on ICS-CERT.

The vulnerability first came directly to Siemens from Lei ChengLin (Z-0ne) from the Fengtai Technologies’ Security Research Team.

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Siemens did create firmware updates to mitigate this remotely exploitable vulnerability in the SIMATIC CP 343-1, TIM 3V-IE, TIM 4R-IE, and CP 443-1 modules.

The following Communication Processor modules, designed for use with Siemens’ SIMATIC S7-300/S7-400 CPUs suffer from the issue:
• SIMATIC CP 343-1 Advanced: All firmware versions prior to V3.0.44
• SIMATIC CP 343-1 Lean / CP 343-1: All firmware versions prior to V3.1.1
• SIMATIC TIM 3V-IE / TIM 3V-IE Advanced: All firmware versions prior to V2.6.0
• SIMATIC TIM 3V-IE DNP3: All firmware versions prior to V3.1.0
• SIMATIC TIM 4R-IE: All firmware versions prior to V2.6.0
• SIMATIC TIM 4R-IE DNP3: All firmware versions prior to V3.1.0
• SIMATIC CP 443-1 / CP 443-1 Advanced: All firmware versions prior to V3.2.9

Successful exploitation of this vulnerability may allow unauthenticated users to perform administrative operations on the SIMATIC Communication Processor under certain conditions.

Siemens is a multinational company headquartered in Munich, Germany.

The affected products, Siemens SIMATIC Communication Processor module families, enable SIMATIC S7-300/S7-400 CPUs for Ethernet or Telecontrol communication. Siemens said these products see use on a global basis.

Communication Processor module families may allow unauthenticated users to perform administrative operations on the Communication Processor if network access to Port 102/TCP is available and the Communication Processor’s configuration end up stored on its corresponding CPUs.

CVE-2015-8214 is the case number assigned to this vulnerability, which has a CVSS v3 base score of 9.4.

No known public exploits specifically target this vulnerability. An attacker with a low skill would be able to exploit this vulnerability.

Siemens released updates for SIMATIC CP 343-1 Advanced, CP 443-1, TIM 3V-IE, and TIM 4R-IE modules and is working on updates for the remaining affected products.

Siemens released a firmware update, V3.0.44, for SIMATIC CP 343-1 Advanced modules. Siemens recommends users update to the new firmware.

Siemens released firmware update, V3.1.1, for the SIMATIC CP 343-1 Lean/CP 343-1 modules. Siemens recommends users update to the new firmware. The firmware update can end up obtained by contacting Siemens and submitting a support request.

Or call a local hotline center.

Siemens released a firmware update, V2.6.0, for SIMATIC TIM 3V-IE / TIM 3V-IE Advanced and SIMATIC TIM 4R-IE modules. Siemens recommends users update to the new firmware.

Siemens released a firmware update, V3.1.0, for SIMATIC TIM 3V-IE DNP3 modules. Siemens recommends users update to the new firmware.

Siemens released a firmware update, V3.1.0, for SIMATIC TIM 4R-IE DNP3 modules. Siemens recommends that users update to the new firmware.

Siemens released a firmware update, V3.2.9, for SIMATIC CP 443-1 modules. Siemens recommends that users update to the new firmware.

Siemens released a firmware update, V3.2.9, for SIMATIC CP 443-1 Advanced modules. Siemens recommends users update to the new firmware.

Siemens also recommends applying the following interim mitigations:
• Activate firewall functionality on Advanced-Communication Processor and reject S7-communication at the perimeter port
• Apply cell protection concept
• Use VPN for protecting network communication between cells
• Apply Defense-in-Depth

Siemens also identified the following conditions that must exist for an attacker to exploit the identified vulnerability:
1. Network access to the affected devices
2. Configuration data for the CP must be stored on CPU
3. Firewall functionality of Advanced-CPs must be turned off for Port 102/TCP

For more information on this vulnerability and detailed instructions, see Siemens Security Advisory SSA-763427.