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1. EXECUTIVE SUMMARY
- CVSS v3 9.1
- ATTENTION: Exploitable remotely/low skill level to exploit
- Vendor: Siemens
- Equipment: SIMATIC PCS 7, WinCC Runtime Professional, WinCC (TIA Portal)
- Vulnerabilities: SQL Injection, Uncaught Exception, Exposed Dangerous Method
2. UPDATE INFORMATION
This updated advisory is a follow-up to the original advisory titled ICSA-19-134-08 Siemens SIMATIC PCS 7, WinCC, TIA Portal that was published May 14, 2019, on the former ICS-CERT website.
3. RISK EVALUATION
Successful exploitation of these vulnerabilities could allow an attacker to execute arbitrary commands on the affected system.
4. TECHNICAL DETAILS
4.1 AFFECTED PRODUCTS
The following Siemens SIMATIC products are affected:
- SIMATIC PCS 7 v8.0 and earlier
- SIMATIC PCS 7 v8.1
- SIMATIC PCS 7 v8.2
--------- Begin Update A Part 1 of 2 --------
- SIMATIC PCS 7 v8.2: all versions prior to v8.2 SP1 with WinCC v7.4 SP1 Upd 11
- SIMATIC PCS 7 v9.0: all versions prior to v9.0 SP1 with WinCC v7.4 SP1 Upd 11
- SIMATIC WinCC v7.4: all versions prior to v7.4 with WinCC v7.4 SP1 Upd 11
--------- End Update A Part 1 of 2 ----------
- SIMATIC WinCC (TIA Portal) v13
- SIMATIC WinCC (TIA Portal) v14
- SIMATIC WinCC (TIA Portal) v15
- SIMATIC WinCC Runtime Professional, all versions
- SIMATIC WinCC v7.2 and earlier
- SIMATIC WinCC v7.3
- SIMATIC WinCC v7.5, all versions prior to v7.5, Update 3
4.2 VULNERABILITY OVERVIEW
4.2.1 SQL INJECTION CWE-89
An attacker with network access to the project file could run arbitrary system commands with the privileges of the local database server. This may impact the confidentiality, integrity, and availability of the affected system.
An attacker with local access to the project file could cause a denial-of-service condition on the affected product as the project file is loaded. Successful exploitation could compromise availability of the affected system.
An authenticated attacker with network access to the DCOM interface could execute arbitrary commands with SYSTEM privileges. Successful exploitation could compromise confidentiality, integrity, and availability of the affected system.
- CRITICAL INFRASTRUCTURE SECTORS: Chemical, Critical Manufacturing, Energy, Food and Agriculture, Water and Wastewater Systems
- COUNTRIES/AREAS DEPLOYED: Worldwide
- COMPANY HEADQUARTERS LOCATION: Germany
Vladimir Dashchenko and Sergey Temnikov from Kaspersky Lab, CNCERT/CC, and ChengBin Wang from Guoli Security Technology reported these vulnerabilities to Siemens.
Siemens has an update available for the following affected products:
--------- Begin Update A Part 2 of 2 --------
- SIMATIC PCS 7 v8.2: Update WinCC to v7.4 SP1 Upd 11
- SIMATIC PCS 7 v9.0: Update WinCC to v7.4 SP1 Upd 11
- SIMATIC WinCC v7.4: Update WinCC to v7.4 SP1 Upd 11
--------- End Update A Part 2 of 2 ----------
- SIMATIC WinCC v7.5: Update WinCC to v7.5 Upd 3
Siemens recommends users apply the following specific workarounds and mitigations to reduce risk until updates or patches are available:
- Apply defense-in-depth strategies.
- Enable “Encrypted communication” in SIMATIC WinCC and SIMATIC PCS 7.
- Only open project files from trusted locations.
As a general security measure, Siemens strongly recommends protecting network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends users configure their environment according to Siemens’ operational guidelines for industrial security and follow the recommendations in the product manuals.
Additional information on industrial security by Siemens can be found at:
For more information on these vulnerabilities and more detailed mitigation instructions, please see Siemens security advisory SSA-697412 at the following location:
NCCIC recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should:
- Minimize network exposure for all control system devices and/or systems, and ensure that they are not accessible from the Internet.
- Locate control system networks and remote devices behind firewalls, and isolate them from the business network.
- When remote access is required, use secure methods, such as Virtual Private Networks (VPNs), recognizing that VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize that VPN is only as secure as the connected devices.
NCCIC reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
NCCIC also provides a section for control systems security recommended practices on the ICS-CERT web page. Several recommended practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.
Additional mitigation guidance and recommended practices are publicly available on the ICS-CERT website in the Technical Information Paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies.
Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to NCCIC for tracking and correlation against other incidents.
No known public exploits specifically target these vulnerabilities.
For any questions related to this report, please contact the NCCIC at:
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