PT-2013-28: Buffer Overflow in Siemens Simatic WinCC and PCS 7
Siemens Simatic WinCC
Version: 7.0 SP3 and earlier
Siemens Simatic PCS 7
Version: 8.0 and earlier
Severity level: Medium
Impact: Arbitrary Code Execution
Access Vector: Remote
Base Score: 6.8
Simatic WinCC is a part of Siemens SIMATIC HMI software that aimed to provide connection between an operator and PLCs that manage technological processes.
The specialists of the Positive Research center have detected "Buffer Overflow" vulnerability in Siemens Simatic WinCC and PCS 7.
An ActiveX control "RegReader", which is installed in the user’s web browser, is susceptible to a buffer overflow. An attacker might trick a victim into visiting a malicious web site, which calls this ActiveX control, triggers the overflow, and take over the victim’s PC.
How to fix
Update your software up to the latest version
02.08.2012 - Vendor gets vulnerability details
15.03.2013 - Vendor releases fixed version and details
29.03.2013 - Public disclosure
The vulnerability was discovered by Gleb Gritsai, Dmitry Nagibin,Positive Research Center (Positive Technologies Company)
Reports on the vulnerabilities previously discovered by Positive Research: