SCADA Vulnerabilities & Exposures (SVE)

CRITIFENCE® SCADA Vulnerabilities and Exposures Database (SVE)

[SVE-252498452] Siemens SIMATIC S7-300 Denial of-Service Vulnerability

Date Type Platform Author EDB-ID CVE-ID OSVDB-ID Download App SIS Signature
2016-06-09PLCSiemens SIMANTIC S7-300Mate J. CsorbaN/A2016-3949N/AN/AN/A

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# Siemens SIMATIC S7-300 Denial of-Service Vulnerability
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### OVERVIEW

Siemens has identified a denial-of-service vulnerability in the SIMANTIC S7-300 CPU family. The vulnerability was reported directly to Siemens by Mate J. Csorba of DNV GL, Marine Cybernetics Services, and Amund Sole of Norwegian University of Science and Technology. Siemens has produced a firmware update to mitigate this vulnerability.

This vulnerability could be exploited remotely.




### AFFECTED PRODUCTS

Siemens reports that the vulnerability affects the following products:

SIMATIC S7-300 CPUs with Profinet support: All versions prior to V3.2.12, and
SIMATIC S7-300 CPUs without Profinet support: All versions prior to V3.3.12.






### IMPACT

An exploit of this vulnerability could cause the affected device to go into defect mode, requiring a cold restart to recover the system.

Impact to individual organizations depends on many factors that are unique to each organization. NCCIC/ICS-CERT recommends that organizations evaluate the impact of this vulnerability based on their operational environment, architecture, and product implementation.






### BACKGROUND

Siemens is a multinational company headquartered in Munich, Germany.

The affected product, SIMATIC S7-300 CPU, has been designed for process control in industrial environments. This product is deployed across several sectors including Chemical, Energy, Food and Agriculture, and Water and Wastewater Systems. Siemens estimates that this product is used worldwide.





### VULNERABILITY CHARACTERIZATION


# VULNERABILITY OVERVIEW

IMPROPER CONTROL OF A RESOURCE THROUGH ITS LIFETIME

Specially crafted packets sent to Port 102/TCP (ISO-TSAP) or via Profibus could cause the affected device to go into defect mode. A cold restart is required to recover the system.

CVE-2016-3949 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).





### VULNERABILITY DETAILS


# EXPLOITABILITY

This vulnerability could be exploited remotely.


# EXISTENCE OF EXPLOIT

No known public exploits specifically target this vulnerability.


# DIFFICULTY

An attacker with a low skill would be able to exploit this vulnerability.





### MITIGATION

Siemens has released SIMATIC S7-300 firmware Versions V3.2.12 and V3.3.12, which fix the vulnerability, and recommends users update to the latest version. Users can find this firmware at the following location:

https://support.industry.siemens.com/cs/ww/en/ps/13752



For more information on this vulnerability and detailed instructions, please see Siemens Security Advisory SSA-818183 at the following location:

http://www.siemens.com/cert/advisories



As a general security measure Siemens strongly recommends keeping firmware up-to-date and to protect network access to the S7-300 CPUs with appropriate mechanisms. It is advised to configure the environment according to Siemens' operational guidelines in order to run the devices in a protected IT environment.

https://www.siemens.com/cert/operational-guidelines-industrial-security