ICS Advisory (ICSA-19-253-03)

Siemens Industrial Products (Update R)

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1. EXECUTIVE SUMMARY

  • CVSS v3 7.5
  • ATTENTION: Exploitable remotely/low attack complexity
  • Vendor: Siemens
  • Equipment: Industrial Products
  • Vulnerabilities: Excessive Data Query Operations in a Large Data Table, Integer Overflow or Wraparound, Uncontrolled Resource Consumption

2. UPDATE INFORMATION

This updated advisory is a follow-up to the advisory update titled ICSA-19-253-04 Siemens Industrial Products (Update Q) published on April 14, 2022 to the ICS webpage on cisa.gov/ics.

3. RISK EVALUATION

Successful exploitation of these vulnerabilities could cause denial-of-service condition.

4. TECHNICAL DETAILS

4.1 AFFECTED PRODUCTS

Siemens reports the vulnerabilities affect the following industrial products:

  • CloudConnect 712: All versions prior to 1.1.5
  • CloudConnect 712: All versions prior to 1.1.5
  • ROX II: All versions prior to 2.13.3
  • RUGGEDCOM APE 1404 Linux: All versions prior to Debian 9 Linux Image 2019-12-13
  • RUGGEDCOM RM1224 (6GK6108-4AM00): All versions prior to v6.2
  • RUGGEDCOM RX 1400 VPE Debian Linux: All versions prior to Debian 9 Linux Image 2019-12-13
  • RUGGEDCOM RX 1400 VPE Linux CloudConnect: All versions prior to Debian 9 Linux Image 2019-12-13 13 (only affected by CVE-2019-11479)
  • SCALANCE M804PB (6GK5804-0AP00-2AA2): All versions prior to v6.2
  • SCALANCE M812-1 ADSL-Router (Annex A) (6GK5812-1AA00-2AA2): All versions prior to v6.2
  • SCALANCE M812-1 ADSL-Router (Annex B) (6GK5812-1BA00-2AA2): All versions prior to v6.2
  • SCALANCE M816-1 ADSL-Router (Annex A) (6GK5816-1AA00-2AA2): All versions prior to v6.2
  • SCALANCE M816-1 ADSL-Router (Annex B) (6GK5816-1BA00-2AA2): All versions prior to v6.2
  • SCALANCE M826-2 SHDSL-Router (6GK5826-2AB00-2AB2): All versions prior to v6.2
  • SCALANCE M874-2 (6GK5874-2AA00-2AA2): All versions prior to v6.2
  • SCALANCE M874-3 (6GK5874-3AA00-2AA2): All versions prior to v6.2
  • SCALANCE M875: All versions
  • SCALANCE M876-3 (6GK5876-3AA02-2BA2): All versions prior to v6.2
  • SCALANCE M876-3 (ROK) (6GK5876-3AA02-2EA2): All versions prior to v6.2
  • SCALANCE M876-4 (EU) (6GK5876-4AA00-2BA2): All versions prior to v6.2
  • SCALANCE M876-4 (NAM) (6GK5876-4AA00-2DA2): All versions prior to v6.2
  • SCALANCE S602: All versions prior to v4.1
  • SCALANCE S612: All versions prior to v4.1
  • SCALANCE S615 (6GK5615-0AA00-2AA2): All versions prior to v6.2
  • SCALANCE S623: All versions prior to v4.1
  • SCALANCE S627-2M: All versions prior to v4.1
  • SCALANCE SC622-2C (6GK5622-2GS00-2AC2): All versions prior to v2.0.1
  • SCALANCE SC632-2C (6GK5632-2GS00-2AC2): All versions prior to v2.0.1
  • SCALANCE SC636-2C (6GK5636-2GS00-2AC2): All versions prior to v2.0.1
  • SCALANCE SC642-2C (6GK5642-2GS00-2AC2): All versions prior to v2.0.1
  • SCALANCE SC646-2C (6GK5646-2GS00-2AC2): All versions prior to v2.0.1
  • SCALANCE W1750D: All versions prior to v8.6.0
  • SCALANCE W-700 IEEE 802.11n family: All versions prior to v6.4
  • SCALANCE W-1700 IEEE 802.11ac family: All versions prior to v2.0
  • SCALANCE WLC711: All versions
  • SCALANCE WLC712: All versions
  • SIMATIC CM 1542-1: All versions prior to 3.0
  • SIMATIC CP 343-1 Advanced (incl. SIPLUS variants): All versions

--------- Begin Update R Part 1 of 2 ---------

  • SIMATIC CP 442-1 RNA (6GK7442-1RX00-0XE0): All versions prior to v1.5.18
  • SIMATIC CP 443-1 (incl. SIPLUS variants): All versions
  • SIMATIC CP 443-1 Advanced (incl. SIPLUS variants): All versions
  • SIMATIC CP 443-1 OPC UA (6GK7443-1UX00-0XE0): All versions
  • SIMATIC CP 443-1 RNA (6GK7443-1RX00-0XE0): All versions prior to v1.5.18

--------- End Update R Part 1 of 2 ---------

  • SIMATIC CP 1242-7C: All versions prior to v3.2
  • SIMATIC CP 1243-1 (6GK7243-1BX30-0XE0): All versions prior to v3.2
  • SIMATIC CP 1243-7 LTE EU (6GK7243-7KX30-0XE0): All versions prior to v3.2
  • SIMATIC CP 1243-7 LTE US (6GK7243-7SX30-0XE0): All versions prior to v3.2
  • SIMATIC CP 1243-8 IRC (6GK7243-8RX30-0XE0): All versions prior to v3.2
  • SIMATIC CP 1542SP-1 (6GK7542-6UX00-0XE0): All versions prior to v2.1
  • SIMATIC CP 1542SP-1 IRC (incl. SIPLUS variants): All versions prior to v2.1
  • SIMATIC CP 1543-1 (6GK7543-1AX00-0XE0): All versions prior to v2.2
  • SIMATIC CP 1543SP-1 (6GK7543-6WX00-0XE0): All versions prior to v2.1
  • SIMATIC CP 1623 (6GK1162-3AA00): All versions prior to v14.00.15.00_51.25.00.01
  • SIMATIC CP 1628 (6GK1162-8AA00): All versions prior to v17.0
  • SIMATIC ITC1500: All versions prior to v3.1.1.0
  • SIMATIC ITC1500 PRO: All versions prior to v3.1.1.0
  • SIMATIC ITC1900: All versions prior to v3.1.1.0
  • SIMATIC ITC1900 PRO: All versions prior to v3.1.1.0
  • SIMATIC ITC2200: All versions prior to v3.1.1.0
  • SIMATIC ITC2200 PRO: All versions prior to v3.1.1.0
  • SIMATIC MV540 H (6GF3540-0GE10): All versions prior to v2.1
  • SIMATIC MV540 S (6GF3540-0CD10): All versions prior to v2.1
  • SIMATIC MV550 H (6GF3550-0GE10): All versions prior to v2.1
  • SIMATIC MV550 S (6GF3550-0CD10): All versions prior to v2.1
  • SIMATIC MV560 U (6GF3560-0LE10): All versions prior to v2.1
  • SIMATIC MV560 X (6GF3560-0HE10): All versions prior to v2.1
  • SIMATIC Reader RF610R CMIIT (6GT2811-6BC10-2AA0): All versions prior to v4.0
  • SIMATIC Reader RF610R ETSI (6GT2811-6BC10-0AA0): All versions prior to v4.0
  • SIMATIC Reader RF610R FCC (6GT2811-6BC10-1AA0): All versions prior to v4.0
  • SIMATIC Reader RF615R CMIIT (6GT2811-6CC10-2AA0): All versions prior to v4.0
  • SIMATIC Reader RF615R ETSI (6GT2811-6CC10-0AA0): All versions prior to v4.0
  • SIMATIC Reader RF615R FCC (6GT2811-6CC10-1AA0): All versions prior to v4.0
  • SIMATIC Reader RF650R ARIB (6GT2811-6AB20-4AA0): All versions prior to v4.0
  • SIMATIC Reader RF650R CMIIT (6GT2811-6AB20-2AA0): All versions prior to v4.0
  • SIMATIC Reader RF650R ETSI (6GT2811-6AB20-0AA0): All versions prior to v4.0
  • SIMATIC Reader RF650R FCC (6GT2811-6AB20-1AA0): All versions prior to v4.0
  • SIMATIC Reader RF680R ARIB (6GT2811-6AA10-4AA0): All versions prior to v4.0
  • SIMATIC Reader RF680R CMIIT (6GT2811-6AA10-2AA0): All versions prior to v4.0
  • SIMATIC Reader RF680R ETSI (6GT2811-6AA10-0AA0): All versions prior to v4.0
  • SIMATIC Reader RF680R FCC (6GT2811-6AA10-1AA0): All versions prior to v4.0
  • SIMATIC Reader RF685R ARIB (6GT2811-6CA10-4AA0): All versions prior to v4.0
  • SIMATIC Reader RF685R CMIIT (6GT2811-6CA10-2AA0): All versions prior to v4.0
  • SIMATIC Reader RF685R ETSI (6GT2811-6CA10-0AA0): All versions prior to v4.0
  • SIMATIC Reader RF685R FCC (6GT2811-6CA10-1AA0): All versions prior to v4.0
  • SIMATIC RF185C: All versions prior to v1.3
  • SIMATIC RF186C: All versions prior to v1.3
  • SIMATIC RF186CI: All versions prior to v1.3
  • SIMATIC RF188C: All versions prior to v1.3
  • SIMATIC RF188CI: All versions prior to v1.3
  • SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (MLFB: 6ES7518-4AX00-1AC0, 6AG1518-4AX00-4AC0, incl. SIPLUS variant): All versions prior to v2.8.4
  • SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0): All versions prior to v2.8.4
  • SIMATIC Teleservice Adapter IE Advanced: All versions
  • SIMATIC Teleservice Adapter IE Basic: All versions
  • SINEMA Remote Connect Server: All versions prior to v2.1
  • SINUMERIK 808D: All versions prior to v4.92
  • SINUMERIK 828D: All versions prior to v4.8 SP5
  • SINUMERIK 840D sl: All versions prior to v4.8 SP5
  • SIPLUS ET 200SP CP 1543SP-1 ISEC (6AG1543-6WX00-7XE0): All versions prior to v2.1
  • SIPLUS ET 200SP CP 1543SP-1 ISEC TX RAIL (6AG2543-6WX00-4XE0): All versions prior to v2.1
  • SIPLUS NET CP 1543-1 (6AG1543-1AX00-2XE0): All versions prior to v2.2
  • SIPLUS S7-1200 CP 1243-1 (6AG1243-1BX30-2AX0): All versions prior to v3.2
  • SIPLUS S7-1200 CP 1243-1 RAIL (6AG2243-1BX30-1XE0): All versions prior to v3.2
  • SIPLUS TIM 1531 IRC (6AG1543-1MX00-7XE0): All versions prior to v2.1
  • TIM 3V-IE (incl. SIPLUS NET variants): All versions
  • TIM 3V-IE Advanced (incl. SIPLUS NET variants): All versions
  • TIM 3V-IE DNP3 (incl. SIPLUS NET variants): All versions
  • TIM 4R-IE (incl. SIPLUS NET variants): All versions
  • TIM 4R-IE DNP3 (incl. SIPLUS NET variants): All versions
  • TIM 1531 IRC (incl. SIPLUS NET variants): All versions prior to 2.1

4.2 VULNERABILITY OVERVIEW

    4.2.1    EXCESSIVE DATA QUERY OPERATIONS IN A LARGE DATA TABLE CWE-1049

    The kernel can be forced to make very expensive calls for every incoming TCP Selective Acknowledgement (SACK) packet which can lead to a denial-of-service condition.

    CVE-2019-8460 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

      4.2.2    INTEGER OVERFLOW OR WRAPAROUND CWE-190

      The kernel is affected by an integer overflow when handling TCP Selective Acknowledgements, which could allow a remote attacker to cause a denial-of-service condition.

      CVE-2019-11477 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

      4.2.3    UNCONTROLLED RESOURCE CONSUMPTION ('RESOURCE EXHAUSTION') CWE-400

      A remote attacker sending specially crafted TCP Selective Acknowledgment (SACK) sequences may cause a denial-of-service condition.

      CVE-2019-11478 has been assigned to this vulnerability. A CVSS v3 base score of 5.3 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L).

      4.2.4    UNCONTROLLED RESOURCE CONSUMPTION ('RESOURCE EXHAUSTION') CWE-400

      An attacker may exploit a vulnerability in the TCP retransmission queue implementation kernel when handling TCP Selective Acknowledgements (SACK) to cause a denial-of-service condition.

      CVE-2019-11479 has been assigned to this vulnerability. A CVSS v3 base score of 5.3 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L).

      4.3 BACKGROUND

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

      4.4 RESEARCHER

      Siemens reported theses vulnerabilities to CISA.

      5. MITIGATIONS

      Siemens recommends users follow the specific workarounds and mitigations below. Siemens has also released fixes for the following products:

      --------- Begin Update R Part 2 of 2 ---------

      --------- End Update R Part 2 of 2 ---------

      Siemens has identified the following specific workarounds and mitigations users can apply to reduce the risk:

      • Restrict network access to affected devices
      • Apply defense-in-depth
      • For SIMATIC Teleservice Adapters (IE Basic, IE Advanced): migrate to a successor product within the SCALANCE M-800 family. For details refer to the notice of discontinuation.

      As a general security measure, Siemens strongly recommends users protect network access to devices with As a general security measure, Siemens recommends protecting network access to devices with appropriate mechanisms. To operate the devices in a protected IT environment, Siemens recommends configuring the environment according to Siemens’ operational guidelines for industrial security and following recommendations in the product manuals.
      Additional information on industrial security by Siemens can be found on the Siemens industrial security webpage.

      For more information, please see Siemens Security Advisory SSA-462066

      CISA recommends users take defensive measures to minimize the risk of exploitation of these vulnerabilities. Specifically, users should:

      • Minimize network exposure for all control system devices and/or systems, and ensure 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 VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize VPN is only as secure as its connected devices.

      CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.

      CISA also provides a section for control systems security recommended practices on the ICS webpage on cisa.gov/ics. 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 e ICS webpage on cisa.gov/ics 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 CISA for tracking and correlation against other incidents.

      No known public exploits specifically target these vulnerabilities.


      Contact Information

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

      Email: CISAservicedesk@cisa.dhs.gov
      Toll Free: 1-888-282-0870

      For industrial control systems cybersecurity information:  https://us-cert.cisa.gov/ics 
      or incident reporting:  https://us-cert.cisa.gov/report

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