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Advisory (ICSA-17-129-01)

Siemens devices using the PROFINET Discovery and Configuration Protocol

Original release date: May 09, 2017

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CVSS v3 6.5

ATTENTION: Exploitable from an adjacent network/low skill level to exploit.

Vendor: Siemens

Equipment: Devices using the PROFINET Discovery and Configuration Protocol (DCP)

Vulnerability: Denial of Service

AFFECTED PRODUCTS

Siemens reports that the vulnerability affects the following products using the PROFINET DCP:

  • SIMATIC WinCC (TIA Portal)
    • V13: All versions prior to V13 SP2, and
    • V14: All versions prior to V14 SP1
  • SIMATIC STEP 7 (TIA Portal)
    • V13: All versions prior to V13 SP2, and
    • V14: All versions prior to V14 SP1
  • SIMATIC STEP 7 V5.X: All versions,
  • STEP 7 - Micro/WIN SMART: All versions,
  • SMART PC Access V2.0,
  • SIMATIC Automation Tool: All versions,
  • SIMATIC WinCC: All versions,
  • SIMATIC PCS 7: All versions,
  • SIMATIC NET PC-Software: All versions,
  • Primary Setup Tool (PST): All versions,
  • Security Configuration Tool (SCT): All versions,
  • SINEMA Server: All versions,
  • SINAUT ST7CC: All versions,
  • SIMATIC WinAC RTX 2010 SP2: All versions,
  • SIMATIC WinAC RTX F 2010 SP2: All versions,
  • SINUMERIK 808D Programming Tool: All versions, and
  • SIMATIC WinCC flexible 2008: All versions.

IMPACT

An attacker may be able to cause a denial-of-service condition requiring a manual restart by exploiting this vulnerability.

MITIGATION

Siemens provides updates that fix the vulnerability for the following affected products and recommends users update to the new fixed version:

  • SIMATIC WinCC (TIA Portal) V13: Update to V13 SP2

https://support.industry.siemens.com/cs/ww/en/view/109746073

  • SIMATIC WinCC (TIA Portal) V14: Update to V14 SP1

https://support.industry.siemens.com/cs/ww/en/view/109745460

  • SIMATIC STEP 7 (TIA Portal) V13: Update to V13 SP2

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

  • SIMATIC STEP 7 (TIA Portal) V14: Update to V14 SP1

https://support.industry.siemens.com/cs/ww/en/view/109745984

The affected component is shared among all of the affected products on the host. Installing one fixed version will mitigate the vulnerability for all Siemens applications installed on that host.

Siemens is preparing updates for the remaining affected products and recommends the following mitigations in the meantime:

  • Apply cell protection concept

https://support.industry.siemens.com/cs/ww/en/view/60119725

  • Use VPN for protecting network communication between cells
  • Apply Defense-in-Depth

As a general security measure, Siemens strongly recommends protecting industrial control systems networks with appropriate mechanisms. Siemens advises configuring the environment according to Siemens operational guidelines in order to run the devices in a protected IT environment.

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-275839 at the following location:

http://www.siemens.com/cert/en/cert-security-advisories.htm

ICS-CERT reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.

ICS-CERT 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 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.

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.

No known public exploits specifically target this vulnerability.

VULNERABILITY OVERVIEW

Specially crafted PROFINET DCP broadcast packets sent to the affected products on a local Ethernet segment (Layer 2) could cause a denial-of-service condition in some services. The services may require manual restart to recover.

CVE-2017-6865 has been assigned to this vulnerability. A CVSS v3 base score of 6.5 has been calculated; the CVSS vector string is (AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

RESEARCHER

Duan JinTong, Ma ShaoShuai, and Cheng Lei from NSFOCUS Security Team reported this vulnerability directly to Siemens.

BACKGROUND

Critical Infrastructure Sectors: Critical Manufacturing, Food and Agriculture, Chemical, Energy, Water and Wastewater Systems

Countries/Areas Deployed: Worldwide

Company Headquarters Location: Germany


Contact Information

For any questions related to this report, please contact ICS-CERT at:

Email: ics-cert@hq.dhs.gov
Toll Free: 1-877-776-7585
International Callers: (208) 526-0900

For industrial control systems security information and incident reporting: http://ics-cert.us-cert.gov

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