ICS Advisory (ICSA-20-105-07)

Siemens SCALANCE and SIMATIC (Update H)

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1. EXECUTIVE SUMMARY

  • CVSS v3 7.5
  • ATTENTION: Exploitable remotely/low attack complexity
  • Vendor: Siemens
  • Equipment: SCALANCE, SIMATIC
  • Vulnerability: Resource Exhaustion

2. UPDATE INFORMATION

This updated advisory is a follow-up to the advisory update titled ICSA-20-105-07 Siemens SCALANCE & SIMATIC (Update G) that was published April 14, 2022, to the ICS webpage on cisa.gov/ics.

3. RISK EVALUATION

Successful exploitation of this vulnerability can result in a denial-of-service condition.

4. TECHNICAL DETAILS

4.1 AFFECTED PRODUCTS

Siemens reports this vulnerability affects the following products:

  • SCALANCE X200-4P IRT (6GK5200-4AH00-2BA3): All versions prior to v5.5.0
  • SCALANCE X201-3P IRT (6GK5201-3BH00-2BA3): All versions prior to v5.5.0
  • SCALANCE X201-3P IRT PRO (6GK5201-3BH00-2BD2): All versions prior to v5.5.0
  • SCALANCE X202-2IRT (6GK5202-2BB00-2BA3): All versions prior to v5.5.0
  • SCALANCE X202-2P IRT (6GK5202-2BH00-2BA3): All versions prior to v5.5.0
  • SCALANCE X202-2P IRT PRO (6GK5202-2JR00-2BA6): All versions prior to v5.5.0
  • SCALANCE X204-2 (6GK5204-2BB10-2AA3): All versions prior to v5.2.5
  • SCALANCE X204-2FM (6GK5204-2BB11-2AA3): All versions prior to v5.2.5
  • SCALANCE X204-2LD (6GK5204-2BC10-2AA3): All versions prior to v5.2.5
  • SCALANCE X204-2LD TS (6GK5204-2BC10-2CA2): All versions prior to v5.2.5
  • SCALANCE X204-2TS (6GK5204-2BB10-2CA2): All versions prior to v5.2.5
  • SCALANCE X204IRT (6GK5204-0BA00-2BA3): All versions prior to v5.5.0
  • SCALANCE X204IRT PRO (6GK5204-0JA00-2BA6): All versions prior to v5.5.0
  • SCALANCE X206-1 (6GK5206-1BB10-2AA3): All versions prior to v5.2.5
  • SCALANCE X206-1LD (6GK5206-1BC10-2AA3): All versions prior to v5.2.5
  • SCALANCE X208 (6GK5208-0BA10-2AA3): All versions prior to v5.2.5
  • SCALANCE X208PRO (6GK5208-0HA10-2AA6): All versions prior to v5.2.5
  • SCALANCE X212-2 (6GK5212-2BB00-2AA3): All versions prior to v5.2.5
  • SCALANCE X212-2LD (6GK5212-2BC00-2AA3): All versions prior to v5.2.5
  • SCALANCE X216 (6GK5216-0BA00-2AA3): All versions prior to v5.2.5
  • SCALANCE X224 (6GK5224-0BA00-2AA3): All versions prior to v5.2.5
  • SCALANCE X302-7 EEC (2x 24V) (6GK5302-7GD00-2EA3): All versions prior to v4.1.4
  • SCALANCE X302-7 EEC (2x 24V, coated) (6GK5302-7GD00-2GA3): All versions prior to v4.1.4
  • SCALANCE X302-7 EEC (2x 230V) (6GK5302-7GD00-4EA3): All versions prior to v4.1.4
  • SCALANCE X302-7 EEC (2x 230V, coated) (6GK5302-7GD00-4GA3): All versions prior to v4.1.4
  • SCALANCE X302-7 EEC (24V) (6GK5302-7GD00-1EA3): All versions prior to v4.1.4
  • SCALANCE X302-7 EEC (24V, coated) (6GK5302-7GD00-1GA3): All versions prior to v4.1.4
  • SCALANCE X302-7 EEC (230V) (6GK5302-7GD00-3EA3): All versions prior to v4.1.4
  • SCALANCE X302-7 EEC (230V, coated) (6GK5302-7GD00-3GA3): All versions prior to v4.1.4
  • SCALANCE X304-2FE (6GK5304-2BD00-2AA3): All versions prior to v4.1.4
  • SCALANCE X306-1LD FE (6GK5306-1BF00-2AA3): All versions prior to v4.1.4
  • SCALANCE X307-2 EEC (2x 24V) (6GK5307-2FD00-2EA3): All versions prior to v4.1.4
  • SCALANCE X307-2 EEC (2x 24V, coated) (6GK5307-2FD00-2GA3): All versions prior to v4.1.4
  • SCALANCE X307-2 EEC (2x 230V) (6GK5307-2FD00-4EA3): All versions prior to v4.1.4
  • SCALANCE X307-2 EEC (2x 230V, coated) (6GK5307-2FD00-4GA3): All versions prior to v4.1.4
  • SCALANCE X307-2 EEC (24V) (6GK5307-2FD00-1EA3): All versions prior to v4.1.4
  • SCALANCE X307-2 EEC (24V, coated) (6GK5307-2FD00-1GA3): All versions prior to v4.1.4
  • SCALANCE X307-2 EEC (230V) (6GK5307-2FD00-3EA3): All versions prior to v4.1.4
  • SCALANCE X307-2 EEC (230V, coated) (6GK5307-2FD00-3GA3): All versions prior to v4.1.4
  • SCALANCE X307-3 (6GK5307-3BL00-2AA3): All versions prior to v4.1.4
  • SCALANCE X307-3 (6GK5307-3BL10-2AA3): All versions prior to v4.1.4
  • SCALANCE X307-3LD (6GK5307-3BM00-2AA3): All versions prior to v4.1.4
  • SCALANCE X307-3LD (6GK5307-3BM10-2AA3): All versions prior to v4.1.4
  • SCALANCE X308-2 (6GK5308-2FL00-2AA3): All versions prior to v4.1.4
  • SCALANCE X308-2 (6GK5308-2FL10-2AA3): All versions prior to v4.1.4
  • SCALANCE X308-2LD (6GK5308-2FM00-2AA3): All versions prior to v4.1.4
  • SCALANCE X308-2LD (6GK5308-2FM10-2AA3): All versions prior to v4.1.4
  • SCALANCE X308-2LH (6GK5308-2FN00-2AA3): All versions prior to v4.1.4
  • SCALANCE X308-2LH (6GK5308-2FN10-2AA3): All versions prior to v4.1.4
  • SCALANCE X308-2LH+ (6GK5308-2FP00-2AA3): All versions prior to v4.1.4
  • SCALANCE X308-2LH+ (6GK5308-2FP10-2AA3): All versions prior to v4.1.4
  • SCALANCE X308-2M (6GK5308-2GG00-2AA2): All versions prior to v4.1.4
  • SCALANCE X308-2M (6GK5308-2GG10-2AA2): All versions prior to v4.1.4
  • SCALANCE X308-2M PoE (6GK5308-2QG00-2AA2): All versions prior to v4.1.4
  • SCALANCE X308-2M PoE (6GK5308-2QG10-2AA2): All versions prior to v4.1.4
  • SCALANCE X308-2M TS (6GK5308-2GG00-2CA2): All versions prior to v4.1.4
  • SCALANCE X308-2M TS (6GK5308-2GG10-2CA2): All versions prior to v4.1.4
  • SCALANCE X310 (6GK5310-0FA00-2AA3): All versions prior to v4.1.4
  • SCALANCE X310 (6GK5310-0FA10-2AA3): All versions prior to v4.1.4
  • SCALANCE X310FE (6GK5310-0BA00-2AA3): All versions prior to v4.1.4
  • SCALANCE X310FE (6GK5310-0BA10-2AA3): All versions prior to v4.1.4
  • SCALANCE X320-1 FE (6GK5320-1BD00-2AA3): All versions prior to v4.1.4
  • SCALANCE X320-1-2LD FE (6GK5320-3BF00-2AA3): All versions prior to v4.1.4
  • SCALANCE X408-2 (6GK5408-2FD00-2AA2): All versions prior to v4.1.4
  • SCALANCE XF201-3P IRT (6GK5201-3JR00-2BA6): All versions prior to v5.5.0
  • SCALANCE XF202-2P IRT (6GK5202-2BH00-2BD2): All versions prior to v5.5.0
  • SCALANCE XF204 (6GK5204-0BA00-2AF2): All versions prior to v5.2.5
  • SCALANCE XF204-2 (6GK5204-2BC00-2AF2): All versions prior to v5.2.5
  • SCALANCE XF204-2BA IRT (6GK5204-2AA00-2BD2): All versions prior to v5.5.0
  • SCALANCE XF204IRT (6GK5204-0BA00-2BF2): All versions prior to v5.5.0
  • SCALANCE XF206-1 (6GK5206-1BC00-2AF2): All versions prior to v5.2.5
  • SCALANCE XF208 (6GK5208-0BA00-2AF2): All versions prior to v5.2.5
  • SCALANCE XR324-4M EEC (2x 24V, ports on front) (6GK5324-4GG00-2ER2): All versions prior to v4.1.4
  • SCALANCE XR324-4M EEC (2x 24V, ports on front) (6GK5324-4GG10-2ER2): All versions prior to v4.1.4
  • SCALANCE XR324-4M EEC (2x 24V, ports on rear) (6GK5324-4GG00-2JR2): All versions prior to v4.1.4
  • SCALANCE XR324-4M EEC (2x 24V, ports on rear) (6GK5324-4GG10-2JR2): All versions prior to v4.1.4
  • SCALANCE XR324-4M EEC (2x 100-240VAC/60-250VDC, ports on front) (6GK5324-4GG00-4ER2): All versions prior to v4.1.4
  • SCALANCE XR324-4M EEC (2x 100-240VAC/60-250VDC, ports on front) (6GK5324-4GG10-4ER2): All versions prior to v4.1.4
  • SCALANCE XR324-4M EEC (2x 100-240VAC/60-250VDC, ports on rear) (6GK5324-4GG00-4JR2):  All versions prior to v4.1.4
  • SCALANCE XR324-4M EEC (2x 100-240VAC/60-250VDC, ports on rear) (6GK5324-4GG10-4JR2): All versions prior to v4.1.4
  • SCALANCE XR324-4M EEC (24V, ports on front) (6GK5324-4GG00-1ER2): All versions prior to v4.1.4
  • SCALANCE XR324-4M EEC (24V, ports on front) (6GK5324-4GG10-1ER2): All versions prior to v4.1.4
  • SCALANCE XR324-4M EEC (24V, ports on rear) (6GK5324-4GG00-1JR2): All versions prior to v4.1.4
  • SCALANCE XR324-4M EEC (24V, ports on rear) (6GK5324-4GG10-1JR2): All versions prior to v4.1.4
  • SCALANCE XR324-4M EEC (100-240VAC/60-250VDC, ports on front) (6GK5324-4GG00-3ER2): All versions prior to v4.1.4
  • SCALANCE XR324-4M EEC (100-240VAC/60-250VDC, ports on front) (6GK5324-4GG10-3ER2): All versions prior to v4.1.4
  • SCALANCE XR324-4M EEC (100-240VAC/60-250VDC, ports on rear) (6GK5324-4GG00-3JR2): All versions prior to v4.1.4
  • SCALANCE XR324-4M EEC (100-240VAC/60-250VDC, ports on rear) (6GK5324-4GG10-3JR2): All versions prior to v4.1.4
  • SCALANCE XR324-4M PoE (24V, ports on front) (6GK5324-4QG00-1AR2): All versions prior to v4.1.4
  • SCALANCE XR324-4M PoE (24V, ports on rear) (6GK5324-4QG00-1HR2): All versions prior to v4.1.4
  • SCALANCE XR324-4M PoE (230V, ports on front) (6GK5324-4QG00-3AR2): All versions prior to v4.1.4
  • SCALANCE XR324-4M PoE (230V, ports on rear) (6GK5324-4QG00-3HR2): All versions prior to v4.1.4
  • SCALANCE XR324-4M PoE TS (24V, ports on front) (6GK5324-4QG00-1CR2): All versions prior to v4.1.4
  • SCALANCE XR324-12M (24V, ports on front) (6GK5324-0GG00-1AR2): All versions prior to v4.1.4
  • SCALANCE XR324-12M (24V, ports on front) (6GK5324-0GG10-1AR2): All versions prior to v4.1.4
  • SCALANCE XR324-12M (24V, ports on rear) (6GK5324-0GG00-1HR2): All versions prior to v4.1.4
  • SCALANCE XR324-12M (24V, ports on rear) (6GK5324-0GG10-1HR2): All versions prior to v4.1.4
  • SCALANCE XR324-12M (230V, ports on front) (6GK5324-0GG00-3AR2): All versions prior to v4.1.4
  • SCALANCE XR324-12M (230V, ports on front) (6GK5324-0GG10-3AR2): All versions prior to v4.1.4
  • SCALANCE XR324-12M (230V, ports on rear) (6GK5324-0GG00-3HR2): All versions prior to v4.1.4
  • SCALANCE XR324-12M (230V, ports on rear) (6GK5324-0GG10-3HR2): All versions prior to v4.1.4
  • SCALANCE XR324-12M TS (24V) (6GK5324-0GG00-1CR2): All versions prior to v4.1.4
  • SCALANCE XR324-12M TS (24V) (6GK5324-0GG10-1CR2): All versions prior to v4.1.4
  • SIMATIC CP 442-1 RNA (6GK7442-1RX00-0XE0): All versions
  • SIMATIC CP 443-1 (6GK7443-1EX30-0XE0): All versions
  • SIMATIC CP 443-1 Advanced (6GK7443-1GX30-0XE0): All versions
  • SIMATIC CP 443-1 RNA (6GK7443-1RX00-0XE0): All versions
  • SIMATIC RF180C (6GT2002-0JD00): All versions
  • SIMATIC RF182C (6GT2002-0JD10): All versions
  • SIPLUS NET CP 443-1 (6AG1443-1EX30-4XE0): All versions
  • SIPLUS NET CP 443-1 Advanced (6AG1443-1GX30-4XE0): All versions
  • SIPLUS NET SCALANCE X308-2 (6AG1308-2FL10-4AA3): All versions prior to v4.1.4

-------- Begin Update H Part 1 of 2 ---------

  • SIMATIC CP 442-1 RNA (6GK7442-1RX00-0XE0): All versions prior to v1.5.1
  • SIMATIC CP 443-1 RNA (6GK7443-1RX00-0XE0): All versions prior to v1.5.18

-------- End Update H Part 1 of 2 ---------

4.2 VULNERABILITY OVERVIEW

4.2.1    UNCONTROLLED RESOURCE CONSUMPTION (‘RESOURCE EXHAUSTION’) CWE-400

The VxWorks-based PROFINET TCP stack can be forced to make resource-intense calls for every incoming packet, which can lead to a denial-of-service condition.

CVE-2019-19301 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).

4.3 BACKGROUND

  • CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
  • COUNTRIES/AREAS DEPLOYED: Worldwide
  • COMPANY HEADQUARTERS LOCATION: Germany

4.4 RESEARCHER

5. MITIGATIONS

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

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

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 further inquiries on security vulnerabilities in Siemens products and solutions, please contact Siemens.

For more information on this vulnerability and the available mitigations, please see Siemens security advisory SSA-102233

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

CISA 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 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 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 this vulnerability.


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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