(PT-2013-80) Positive Technologies Security Advisory
Improper input validation in SIMATIC WinCC Open Architecture

Vulnerable platform

SIMATIC WinCC Open Architecture
Version: 3.12 and earlier

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

Severity level

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

CVSS v2:
Base Score: 5.0
Vector: (AV:N/AC:L/Au:N/C:N/I:N/A:P)

CVE: CVE-2014-1699

Platform description

SIMATIC WinCC Open Architecture is a SCADA system for visualizing and operating processes, production flows, machines and plants in all lines of business.

Vulnerability description

The specialists of the Positive Research center have detected an Improper input validation vulnerability in SIMATIC WinCC Open Architecture.

The SIMATIC WinCC OA integrated Web server at Port 4999/TCP might allow attackers to perform a denial of service attack on the SIMATIC WinCC OA monitoring service by sending malformed HTTP requests over the network without authentication. Restarting the WinCC OA Console recovers the monitoring service.

How to fix

Update your software up to the latest version

Advisory status

01.12.2013 - Vendor gets vulnerability details
03.02.2014 - Vendor releases fixed version and details
14.02.2014 - Public disclosure

Credits

The vulnerability was detected by Gleb Gritsai and Kirill Nesterov, Positive Research Center (Positive Technologies Company)

References

http://en.securitylab.ru/lab/PT-2013-80
http://www.siemens.com/innovation/pool/de/forschungsfelder/siemens_security_advisory_ssa-342587.pdf
https://ics-cert.us-cert.gov/advisories/ICSA-14-035-01

Reports on the vulnerabilities previously discovered by Positive Research:

http://www.ptsecurity.com/research/advisory/
http://en.securitylab.ru/lab/

About Positive Technologies

Positive Technologies is a leading provider of vulnerability assessment, compliance management and threat analysis solutions to more than 1,000 global enterprise clients. Our solutions work seamlessly across your entire business: securing applications in development; assessing your network and application vulnerabilities; assuring compliance with regulatory requirements; and blocking real-time attacks. Our commitment to clients and research has earned Positive Technologies a reputation as one of the foremost authorities on SCADA, Banking, Telecom, Web Application and ERP security, and distinction as the #1 fastest growing Security and Vulnerability Management firm in 2012, as shown in an IDC report*. To learn more about Positive Technologies please visit www.ptsecurity.com

*Source: IDC Worldwide Security and Vulnerability Management 2013-2017 Forecast and 2012 Vendor Shares, doc #242465, August 2013. Based on year-over-year revenue growth in 2012 for vendors with revenues of $20M+