PT-2013-26: Information Disclosure in Siemens Simatic WinCC and PCS 7

Vulnerable software

Siemens Simatic WinCC
Version: 7.0 SP3 and earlier

Siemens Simatic PCS 7
Version: 8.0 and earlier

Application link:
http://www.siemens.com/

Severity level

Severity level: Medium
Impact: Information Disclosure
Access Vector: Remote  

CVSS v2:
Base Score: 4.0
Vector: (AV:N/AC:L/Au:S/C:P/I:N/A:N)

CVE: CVE-2013-0676

Software description

Simatic WinCC is a part of Siemens SIMATIC HMI software that aimed to provide connection between an operator and PLCs that manage technological processes.

Vulnerability description

The specialists of the Positive Research center have detected "Information Disclosure" vulnerability in Siemens Simatic WinCC and PCS 7.

Users with legitimate, non-privileged access to WinCC MS SQL database can retrieve obfuscated user passwords for WebNavigator. For doing this, access to the system is needed either locally or from the adjacent network and the user’s account must have adequate permissions.

How to fix

Update your software up to the latest version

Advisory status

11.07.2012 - Vendor gets vulnerability details
15.03.2013 - Vendor releases fixed version and details
29.03.2013 - Public disclosure

Credits

The vulnerability was discovered by Sergey Gordeychik, Positive Research Center (Positive Technologies Company)

References

http://en.securitylab.ru/lab/PT-2013-26
http://www.siemens.com/corporate-technology/pool/de/forschungsfelder/siemens_security_advisory_ssa-714398.pdf

Reports on the vulnerabilities previously discovered by Positive Research:

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