This updated advisory is a follow-up to the original advisory titled ICSA-15-064-02 Siemens SIMATIC ProSave, SIMATIC CFC, SIMATIC STEP 7, SIMOTION Scout, and STARTER Insufficiently Qualified Paths that was published March 5, 2015, on the NCCIC/ICS‑CERT web site.
Ivan Sanchez from WiseSecurity Team has identified a search path vulnerability in the Siemens SIMATIC ProSave, SIMATIC CFC, SIMATIC STEP 7, SIMOTION Scout, and STARTER applications. Siemens has produced updates for each of these products that mitigates this vulnerability.
The following Siemens products are affected:
This vulnerability could allow attackers to execute arbitrary code from files located on the local file system or connected network shares with the privileges of the user running the affected products.
Impact to individual organizations depends on many factors that are unique to each organization. ICS-CERT recommends that organizations evaluate the impact of this vulnerability based on their operational environment, architecture, and product implementation.
Siemens is a multinational company headquartered in Munich, Germany.
SIMATIC ProSave is used for backup restore and firmware update for SIMATIC HMI panels. SIMOTION SCOUT is a framework for motion control engineering system tools. STARTER is a drive engineering tool for parameterizing and commissioning. SIMATIC CFC (Continuous Function Chart) is a graphic editor that is a core component of PCS 7 engineering. STEP 7 is Siemens’ engineering software for PLC and hardware configuration. SIMATIC PCS 7 is a distributed control system (DCS) integrating SIMATIC STEP 7 and SIMATIC CFC. According to Siemens, these products are deployed across several sectors including Chemical, Energy, Food and Agriculture, and Water and Wastewater Systems. Siemens estimates that these products are used worldwide.
Insufficiently qualified paths could allow attackers to execute arbitrary code from files located on the local file system or connected network shares with the privileges of the user running the affected products. For successful exploitation an unsuspecting user must be tricked into opening a manipulated application file.
CVE-2015-1594b has been assigned to this vulnerability. A CVSS v2 base score of 6.9 has been assigned; the CVSS vector string is (AV:L/AC:M/Au:N/C:C/I:C/A:C).c
This vulnerability is not exploitable remotely and cannot be exploited without user interaction. The exploit is only triggered when a local user runs the vulnerable application and loads the malformed file.
No known public exploits specifically target this vulnerability.
Crafting a working exploit for this vulnerability would require a moderate amount of skill. Social engineering is required to convince the user to accept the malformed file. Additional user interaction is needed to load the malformed file. This decreases the likelihood of a successful exploit.
Siemens provides updates for the following products and recommends customers to update to the new fixed versions:
For more information on these vulnerabilities and detailed instructions, please see Siemens Security Advisory SSA-451236 at the following location:
ICS-CERT recommends that users take the following measures to protect themselves from social engineering attacks:
In addition, 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.
For any questions related to this report, please contact the CISA at:
Toll Free: 1-888-282-0870
For industrial control systems cybersecurity information: https://www.us-cert.gov/ics
or incident reporting: https://www.us-cert.gov/report
CISA continuously strives to improve its products and services. You can help by choosing one of the links below to provide feedback about this product.
This product is provided subject to this Notification and this Privacy & Use policy.
Was this document helpful? Yes | Somewhat | No