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U.S. Department of Homeland Security Seal. ICS-CERT. Industrial Control Systems Cyber Emergency Response Team.
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Advisory (ICSA-16-313-02)

Siemens Industrial Products Local Privilege Escalation Vulnerability (Update H)

Original release date: November 08, 2016 | Last revised: June 14, 2018

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1. EXECUTIVE SUMMARY

  • CVSS v3 6.4
  • ATTENTION: Exploitable locally
  • Vendor: Siemens
  • Equipment: Industrial Products
  • Vulnerability: Improper privilege management

2. UPDATE INFORMATION

This updated advisory is a follow-up to the updated advisory titled ICSA-16-313-02G Siemens Industrial Products Local Privilege Escalation Vulnerability that was published January 25, 2018, on the NCCIC/ICS-CERT website.

3. RISK EVALUATION

This vulnerability could allow local users to escalate their privileges if the affected products are not installed under the default path.

4. TECHNICAL DETAILS

4.1 AFFECTED PRODUCTS

--------- Begin Update H Part 1 of 2 --------
  • Siemens reports that the vulnerability affects the following products:
  • Primary Setup Tool (PST): All versions prior to v4.2 HF1,
  • SIMATIC IT Production Suite: All versions prior to v7.0 SP1 HFX 2,
  • SIMATIC NET PC-Software: All versions prior to v14,
  • SIMATIC PCS 7 v7.1 and earlier versions,
  • SIMATIC PCS 7 v8.0: All versions,
  • SIMATIC PCS 7 v8.1: All versions,
  • SIMATIC PCS 7 v8.2: All versions prior to v8.2 SP1,
  • SIMATIC STEP 7 (TIA Portal) v13: All versions prior to v13 SP2,
  • SIMATIC STEP 7 v5.X: All versions prior to v5.5 SP4 HF11,
  • SIMATIC WinCC (TIA Portal) Basic, Comfort, Advanced: All versions prior to v14,
  • SIMATIC WinCC (TIA Portal) Professional v13: All versions prior to v13 SP2,
  • SIMATIC WinCC (TIA Portal) Professional v14: All versions prior to v14 SP1,
  • SIMATIC WinCC Runtime Professional v13: All versions prior to v13 SP2,
  • SIMATIC WinCC Runtime Professional v14: All versions prior to v14 SP1,
  • SIMATIC WinCC v7.0 SP2 and earlier versions prior to v7.0 SP2 Update 12,
  • SIMATIC WinCC v7.0 SP3: All versions prior to v7.0 SP3 Update 8,
  • SIMATIC WinCC v7.2: All versions prior to v7.2 Update 14,
  • SIMATIC WinCC v7.3: All versions prior to v7.3 Update 11,
  • SIMATIC WinCC v7.4: All versions prior to v7.4 SP1,
  • SIMIT: All versions prior to v9.0 SP1,
  • SINEMA Remote Connect Client: All versions prior to v1.0 SP3,
  • SINEMA Server: All versions prior to v13 SP2,
  • SOFTNET Security Client v5.0: All versions,
  • Security Configuration Tool (SCT): All versions prior to v4.3 HF1,
  • TeleControl Server Basic: All versions prior to v3.0 SP2,
  • SIMATIC WinAC RTX 2010 SP2: All versions, and
  • SIMATIC WinAC RTX F 2010 SP2: All versions.
-------- End Update H Part 1 of 2 ---------- 

4.2 VULNERABILITY OVERVIEW

4.2.1    IMPROPER PRIVILEGE MANAGEMENT CWE-269

Unquoted service paths could allow local Microsoft Windows operating system users to escalate their privileges if the affected products are not installed under their default path (“C:\Program Files\*” or the localized equivalent).

CVE-2016-7165 has been assigned to this vulnerability. A CVSS v3 base score of 6.4 has been calculated; the CVSS vector string is (AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H).

4.3 BACKGROUND

•    CRITICAL INFRASTRUCTURE SECTORS: Chemical, Energy, Food and Agriculture, and Water and Wastewater Systems
•    COUNTRIES/AREAS DEPLOYED: Worldwide
•    COMPANY HEADQUARTERS LOCATION: Germany

4.4 RESEARCHER

WATERSURE and KIANDRA IT reported this vulnerability to Siemens.

5. MITIGATIONS

If the affected products are installed under their default path (“C:\Program Files\*” or the localized equivalent) and the default file system access permissions for drive C:\ were not modified, the security vulnerability is not exploitable.

However, if the affected products are not installed under their default path (“C:\Program Files\*” or the localized equivalent), the security vulnerability is potentially exploitable.

--------- Begin Update H Part 2 of 2 --------

Siemens has released updates for the following products and encourages users to apply the updates as soon as possible:

  • Primary Setup Tool (PST): Update to v4.2 HF1

https://support.industry.siemens.com/cs/ww/en/view/19440762

  • SIMATIC IT Production Suite: Update to v7.0 SP1 HFX 2

https://mes-simaticit.siemens.com/tss/html/hfc.html

  • SIMATIC NET PC-Software: Upgrade to v14

https://support.industry.siemens.com/cs/ww/en/view/109741996

  • SIMATIC PCS 7 v7.1 and v8.0, Apply temporary fix

https://support.industry.siemens.com/cs/ww/en/view/109740929 

  • SIMATIC PCS 7 v8.1: Apply temporary fix and apply SIMATIC WinCC v7.3 Upd 11

https://support.industry.siemens.com/cs/ww/en/view/109740929 

https://support.industry.siemens.com/cs/ww/en/view/109742642 

  • SIMATIC PCS 7 v8.2: Update to v8.2 SP1

To obtain SIMATIC PCS 7 v8.2 SP1 contact your local support.

  • SIMATIC STEP 7 (TIA Portal) v13: Update to v13 SP2

https://support.industry.siemens.com/cs/ww/en/view/109745155

  • SIMATIC STEP 7 v5.X: Update to v5.5 SP4 HF11 

https://support.industry.siemens.com/cs/de/en/view/109737984

  • SIMATIC WinCC (TIA Portal) Basic, Comfort, Advanced: Upgrade to v14

https://support.industry.siemens.com/cs/ww/en/view/109739719

  • SIMATIC WinCC (TIA Portal) Professional v13: Update to v13 SP2

https://support.industry.siemens.com/cs/ww/en/view/109745155 

  • SIMATIC WinCC (TIA Portal) Professional v14: Update to v14 SP1

https://support.industry.siemens.com/cs/ww/en/view/109746074

  • SIMATIC WinCC Runtime Professional v13: Update to v13 SP2

https://support.industry.siemens.com/cs/ww/en/view/109746075

  • SIMATIC WinCC Runtime Professional v14: Update to v14 SP1

https://support.industry.siemens.com/cs/ww/en/view/109746276

  • SIMATIC WinCC v7.0 SP2: and earlier versions: Update to v7.0 SP2 Update 12

https://support.industry.siemens.com/cs/ww/en/view/109741519

  • SIMATIC WinCC v7.0 SP3: Update to v7.0 SP3 Update 8

https://support.industry.siemens.com/cs/ww/en/view/109741127

  • SIMATIC WinCC v7.2: Update to v7.2 Update 14

https://support.industry.siemens.com/cs/ww/en/view/109745028

  • SIMATIC WinCC v7.3: Update to v7.3 Update 11

https://support.industry.siemens.com/cs/ww/en/view/109742642

  • SIMATIC WinCC v7.4: Update to v7.4 SP1

https://support.industry.siemens.com/cs/ww/en/view/109746038

  • SIMIT v9.0: Update to v9.0 SP1

https://support.industry.siemens.com/cs/ww/en/view/109743963

  • SINEMA Remote Connect Client: Update to v1.0 SP3

https://support.industry.siemens.com/cs/ww/en/view/109754280

  • SINEMA Server: Update to v13 SP2

https://support.industry.siemens.com/cs/ww/en/view/109741833

  • SOFTNET Security Client v5.0: Apply temporary fix

https://support.industry.siemens.com/cs/ww/en/view/109740929 

  • Security Configuration Tool (SCT): Update to v4.3 HF1

https://support.industry.siemens.com/cs/ww/en/view/109744041

  • TeleControl Server Basic: Update to v3.0 SP2

https://support.industry.siemens.com/cs/ww/en/view/109483119

  • SIMATIC WinAC RTX 2010 SP2 and SIMATIC WinAC RTX F 2010 SP2: Apply temporary fix

https://support.industry.siemens.com/cs/ww/en/view/109740929 

Siemens strongly recommends users protect network access to engineering workstations and project storage with appropriate mechanisms. Siemens also advises that users configure the operational environment according to Siemens’ Operational Guidelines for Industrial Security:

https://www.siemens.com/cert/operational-guidelines-industrial-security 

For more information on this vulnerability and more detailed mitigation instructions, please see Siemens Security Advisory SSA-701708 at the following location:

http://www.siemens.com/cert/advisories

--------- End Update H Part 2 of 2 ----------

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 this vulnerability. This vulnerability is not exploitable remotely. High skill level is needed to exploit.


Contact Information

For any questions related to this report, please contact the NCCIC at:

Email: NCCICCUSTOMERSERVICE@hq.dhs.gov
Toll Free: 1-888-282-0870

For industrial control systems cybersecurity information:  http://ics-cert.us-cert.gov 
or incident reporting:  https://ics-cert.us-cert.gov/Report-Incident?

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