Aleksandr Timorin from Positive Technologies has identified authentication vulnerabilities in the Siemens SIMATIC STEP 7 TIA Portal application. Siemens has produced a service pack that mitigates these vulnerabilities.
The following Siemens products are affected:
A local user who is tricked into exploiting these vulnerabilities could possibly escalate privileges for an attacker. Impact to individual organizations depends on many factors that are unique to each organization. NCCIC/ICS-CERT recommends that organizations evaluate the impact of these vulnerabilities based on their operational environment, architecture, and product implementation.
Siemens is a multinational company headquartered in Munich, Germany.
The affected product, SIMATIC STEP 7 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.
Device user passwords in TIA Portal project files are stored using a weak hashing algorithm. Attackers with read access to the project file could possibly reconstruct the passwords for device users.
CVE-2015-1355b has been assigned to this vulnerability. A CVSS v2 base score of 2.1 has been assigned; the CVSS vector string is (AV:L/AC:L/Au:N/C:P/I:N/A:N).c
Privilege information for device users is stored unprotected in the TIA Portal project file. Attackers with access to the project file could possibly read and modify the permissions for device users in the project file. If unsuspecting users are tricked to download the manipulated project file to the device, the user permissions become active.
CVE-2015-1356e has been assigned to this vulnerability. A CVSS v2 base score of 2.6 has been assigned; the CVSS vector string is (AV:L/AC:H/Au:N/C:P/I:P/A:N).f
These vulnerabilities are not exploitable remotely without local user interaction.
No known public exploits specifically target these vulnerabilities.
Crafting a working exploit for these vulnerabilities would be difficult. 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 Service Pack 1 for STEP 7 TIA Portal V13, which mitigates the vulnerabilities.
For more information on these vulnerabilities and detailed instructions, please see Siemens Security Advisory SSA-234789 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.
In addition, ICS-CERT recommends that users take the following measures to protect themselves from social engineering attacks:
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