PT-2013-88: Denial of Service in Siemens SIMATIC S7-1200 CPU PLC Vulnerable platformSiemens SIMATIC S7-1200 CPU PLC Version: 3.x and earlierLink: http://www.siemens.com/Severity levelSeverity 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-2014-2252Platform descriptionSIMATIC 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 descriptionThe 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 fixUpdate your firmware up to the latest versionAdvisory status 15.04.2013 - Vendor gets vulnerability details 20.03.2014 - Vendor releases fixed version and details 25.03.2014 - Public disclosureCreditsThe vulnerability was detected by Dmitry Serebryannikov, Ilya Karpov, Alexey Osipov, Yury Goltsev, and Alexander Timorin, Positive Research Center (Positive Technologies Company)Referenceshttp://en.securitylab.ru/lab/PT-2013-88 http://www.siemens.com/innovation/pool/de/forschungsfelder/siemens_security_advisory_ssa-654382.pdf https://ics-cert.us-cert.gov/advisories/ICSA-14-079-02 Reports on the vulnerabilities previously discovered by Positive Research:http://www.ptsecurity.com/research/advisory/ http://en.securitylab.ru/lab/