PT-2014-13: Privilege Gaining in Siemens SIMATIC WinCC

Vulnerable platform

SIMATIC WinCC
Version: 7.2 and earlier

SIMATIC PCS7
Version: 8.0 and earlier

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

Severity level

Severity level: Medium
Impact: Privilege Gaining
Access Vector: Remote

CVSS v2:
Base Score: 4.9
Vector: (AV:N/AC:M/Au:S/C:P/I:P/A:N)

CVE: CVE-2014-4683

Platform description

Siemens WinCC is a part of Siemens SIMATIC HMI software that aimed to provide connection between an operator and PLCs that manage technological processes. The WebNavigator component of WinCC gives the users the possibility to control their plants via the web browser with the same look-and-feel like local operator stations.

Vulnerability description

The specialists of the Positive Research center have detected a Privilege Gaining vulnerability in SIMATIC WinCC.

Existing access control of the WinCC WebNavigator server at port 80/tcp and port 443/tcp could allow remote authenticated users to escalate their privileges in WinCC.

How to fix

Update your software up to the latest version

Advisory status

23.12.2012 - Vendor gets vulnerability details
23.07.2014 - Vendor releases fixed version and details
29.07.2014 - Public disclosure

Credits

The vulnerability was detected by Alexander Tlyapov, Positive Research Center (Positive Technologies Company)

References

http://en.securitylab.ru/lab/PT-2014-13
http://www.siemens.com/innovation/pool/de/forschungsfelder/siemens_security_advisory_ssa-214365.pdf

Reports on the vulnerabilities previously discovered by Positive Research:

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