Siemens Mitigates SIMATIC Vulnerabilities

Wednesday, November 23, 2016 @ 10:11 AM gHale

Siemens produced a firmware to mitigate vulnerabilities that affect SIMATIC CP 1543-1, according to a report with ICS-CERT.

These remotely exploitable vulnerabilities ended up coordinated directly with Siemens by SOGETI and Agence nationale de la sécurité des systèmes d’information (ANSSI).

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SIMATIC CP 1543-1, all versions prior to V2.0.28 suffer from the issue.

An attacker who exploits these vulnerabilities may be able to elevate privileges on the affected devices or cause a denial-of-service condition.

Siemens is a multinational company headquartered in Munich, Germany.

The affected product, SIMATIC CP 1543-1 communication processor, connects the S7-1500 controller to Ethernet networks. It provides integrated security functions, such as firewall and virtual private networks (VPNs), and supports other protocols with data encryption such as FTP. The communication processor protects S7-1500 stations against unauthorized access, as well as integrity and confidentiality of transmitted data.

This product sees action across several sectors including chemical, energy, food and agriculture, and water and wastewater systems. Siemens said these products are used worldwide.

Users with elevated privileges to TIA-Portal and project data on the engineering station could possibly get privileged access on affected devices.

CVE-2016-8561 is the case number assigned to this vulnerability, which has a CVSS v3 base score of 6.6.

Under special conditions, it may be possible to write SNMP variables on Port 161/UDP that should be read-only and should only be configured with TIA-Portal. A write to these variables could reduce the availability or cause a denial of service.

CVE-2016-8562 is the case number assigned to this vulnerability, which has a CVSS v3 base score of 5.3.

No known public exploits specifically target these vulnerabilities. Crafting a working exploit for these vulnerabilities would be difficult.

Siemens provides firmware update V2.0.28 for SIMATIC CP 1543-1 devices, which fixes the vulnerabilities, and recommends users update to the new version. This update can be found on the Siemens web site.

Siemens strongly recommends users protect network access to the management interface of perimeter devices with appropriate mechanisms. Siemens also advises that users configure the operational environment, according to Siemens’ Operational Guidelines for Industrial Security.

For more information on this vulnerability and more detailed mitigation instructions, please see Siemens Security Advisory SSA-672373.

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