PT-2013-88: Denial of Service in Siemens SIMATIC S7-1200 CPU PLC

Vulnerable platform

Siemens SIMATIC S7-1200 CPU PLC
Version: 3.x and earlier

Link:
http://www.siemens.com/

Severity level

Severity level: Medium
Impact: Denial of Service
Access Vector: Remote

CVSS v2:
Base Score: 6.1
Vector: (AV:A/AC:L/Au:N/C:N/I:N/A:C)

CVE: CVE-2014-2252

Platform description

SIMATIC S7-1200 controllers are new modular miniature controllers. Due to the compact modular design with a high performance at the same time, the SIMATIC S7-1200 is suitable for a wide variety of automation applications. Its range of use extends from the replacement of relays and contactors up to complex automation tasks in networks and within distributed structures.

Vulnerability description

The specialists of the Positive Research center have detected a Denial of Service vulnerability in Siemens SIMATIC S7-1200 CPU PLC.

An attacker could cause the device to go into defect mode if specially crafted PROFINET packets are sent to the device. A cold restart is required to recover the system.

How to fix

Update your firmware up to the latest version

Advisory status

15.04.2013 - Vendor gets vulnerability details
20.03.2014 - Vendor releases fixed version and details
25.03.2014 - Public disclosure

Credits

The vulnerability was detected by Dmitry Serebryannikov, Ilya Karpov, Alexey Osipov, Yury Goltsev, and Alexander Timorin, Positive Research Center (Positive Technologies Company)

References

<http://en.securitylab.ru/lab/PT-2013-88&gt;
<http://www.siemens.com/innovation/pool/de/forschungsfelder/siemens_security_advisory_ssa-654382.pdf&gt;
<https://ics-cert.us-cert.gov/advisories/ICSA-14-079-02&gt;

Reports on the vulnerabilities previously discovered by Positive Research:

<http://www.ptsecurity.com/research/advisory/&gt;
<http://en.securitylab.ru/lab/&gt;