This updated advisory is a follow-up to the updated advisory titled ICSA-14-329-02C Siemens SIMATIC WinCC, PCS7, and TIA Portal Vulnerabilities that was published December 18, 2014, on the NCCIC/ICS-CERT web site.
Siemens has identified two vulnerabilities within products using the Siemens WinCC application. Siemens has produced a patch that mitigates this vulnerability in the WinCC application and is working on updates for the remaining affected products to address the other vulnerability in the WinCC application.
These vulnerabilities could be exploited remotely. Exploits that target these vulnerabilities are potentially available.
The following Siemens products are affected:
These vulnerabilities allow for unauthenticated remote code execution.
Impact to individual organizations depends on many factors that are unique to each organization. ICS-CERT recommends that organizations evaluate the impact of these vulnerabilities based on their operational environment, architecture, and product implementation.
Siemens is an international company headquartered in Munich, Germany.
The affected product, SIMATIC WinCC, is a supervisory control and data acquisition (SCADA) system. PCS7 is a distributed control system (DCS) integrating SIMATIC WinCC. TIA Portal is engineering software for SIMATIC products. This software is deployed across several sectors including Chemical, Energy, Food and Agriculture, and Water and Wastewater Systems. Siemens estimates that these products are used primarily in the United States and Europe with a small percentage in Asia.
A component within WinCC could allow remote code execution for unauthenticated users if specially crafted packets are sent to the WinCC server.
CVE-2014-8551b has been assigned to this vulnerability. A CVSS v2 base score of 10.0 has been assigned; the CVSS vector string is (AV:N/AC:L/Au:N/C:C/I:C/A:C).c
A component within WinCC could allow unauthenticated users to extract arbitrary files from the WinCC server if specially crafted packets are sent to the server.
CVE-2014-8552e has been assigned to this vulnerability. A CVSS v2 base score of 7.8 has been assigned; the CVSS vector string is (AV:N/AC:L/Au:N/C:C/I:N/A:N).f
These vulnerabilities could be exploited remotely.
Exploits that target these vulnerabilities are potentially available. Indicators exist that this vulnerability may have been exploited during a recent campaign.
An attacker with a low skill would be able to exploit these vulnerabilities.
Siemens has released updates for the following products and strongly encourages customers to upgrade to the new versions as soon as possible:
TIA Portal V13 (including WinCC Professional Runtime)
WinCC V7.0 SP3
PCS 7 V7.1 SP4
PCS 7 V8.0 SP2
PCS 7 V8.1
Until updates can be deployed, Siemens advises customers to mitigate the risk of their products by implementing the following:
As a general security measure, Siemens strongly recommends protecting network access to the SIMATIC WinCC server with appropriate mechanisms. It is also advised to follow recommended security practices and to configure the environment according to operational guidelines in order to run the devices in a protected IT environment.
For more information on these vulnerabilities and detailed instructions, please see Siemens Security Advisory SSA-134508 at the following location:
ICS-CERT encourages asset owners to take additional defensive measures to protect against this and other cybersecurity risks.
ICS-CERT also provides a section for control systems security recommended practices on the ICS-CERT web page at: <http://ics-cert.us-cert.gov/content/recommended-practices>. Several recommended practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies. ICS-CERT reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
Additional mitigation guidance and recommended practices are publicly available in the ICS‑CERT Technical Information Paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies, that is available for download from the ICS-CERT web site (<http://ics-cert.us-cert.gov/>).
Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to ICS-CERT for tracking and correlation against other incidents.