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             AUSCERT External Security Bulletin Redistribution

                               ESB-2019.3812
   Advisory (icsa-19-283-01) Siemens Industrial Real-Time (IRT) Devices
                              11 October 2019

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Siemens Industrial Real-Time (IRT) Devices
Publisher:         ICS-CERT
Operating System:  Network Appliance
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-10923  

Original Bulletin: 
   https://www.us-cert.gov/ics/advisories/icsa-19-283-01

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ICS Advisory (ICSA-19-283-01)

Siemens Industrial Real-Time (IRT) Devices

Original release date: October 10, 2019

Legal Notice

All information products included in http://ics-cert.us-cert.gov are
provided"as is" for informational purposes only. The Department of Homeland
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information contained within. DHS does not endorse any commercial product or
service, referenced in this product or otherwise. Further dissemination of this
product is governed by the Traffic Light Protocol (TLP) marking in the header.
For more information about TLP, see http://www.us-cert.gov/tlp/ .



1. EXECUTIVE SUMMARY

  o CVSS v3 7.5
  o ATTENTION: Exploitable remotely/low skill level to exploit
  o Vendor: Siemens
  o Equipment: Industrial Real-Time (IRT) Devices
  o Vulnerability: Improper Input Validation

2. RISK EVALUATION

Successful exploitation of this vulnerability could cause a denial-of-service
condition.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

Siemens reports the vulnerability affects the following products and versions:

  o CP1604/CP1616: All versions prior to 2.8
  o Development/Evaluation Kits for PROFINET IO:
       DK Standard Ethernet Controller: All versions prior to 4.1.1 Patch 05
       EK-ERTEC 200: All versions prior to 4.5.0 Patch 01
       EK-ERTEC 200P: All versions prior to 4.5.0
  o SCALANCE X-200IRT: All versions prior to 5.2.1
  o SIMATIC ET 200M: All versions
  o SIMATIC ET 200S: All versions
  o SIMATIC ET 200ecoPN (except 6ES7148-6JD00-0AB0 and 6ES7146-6FF00-0AB0): All
    versions
  o SIMATIC ET 200pro: All versions
  o SIMATIC PN/PN Coupler 6ES7158-3AD01-0XA0: All versions
  o SIMATIC S7-300 CPU family (incl. F): All versions
  o SIMATIC S7-400 (incl. F) v6 and below: All versions
  o SIMATIC S7-400 PN/DP v7 (incl. F): All versions
  o SIMATIC WinAC RTX (F) 2010: All versions prior to SP3
  o SIMOTION: All versions
  o SINAMICS DCM: All versions prior to 1.5 HF1
  o SINAMICS DCP: All versions
  o SINAMICS G110M v4.7 (Control Unit): All versions prior to 4.7 SP10 HF5
  o SINAMICS G120 v4.7 (Control Unit): All versions prior to 4.7 SP10 HF5
  o SINAMICS G130 v4.7 (Control Unit): All versions prior to 4.7 HF29
  o SINAMICS G150 (Control Unit): All versions prior to 4.8
  o SINAMICS GH150 v4.7 (Control Unit): All versions
  o SINAMICS GL150 v4.7 (Control Unit): All versions
  o SINAMICS GM150 v4.7 (Control Unit): All versions
  o SINAMICS S110 (Control Unit): All versions
  o SINAMICS S120 v4.7 (Control Unit and CBE20): All versions prior to 4.7 HF34
  o SINAMICS S150 (Control Unit): All versions prior to 4.8
  o SINAMICS SL150 v4.7 (Control Unit): All versions
  o SINAMICS SM120 v4.7 (Control Unit): All versions
  o SINUMERIK 828D: All versions prior to 4.8 SP5
  o SINUMERIK 840D sl: All versions

3.2 VULNERABILITY OVERVIEW

3.2.1 IMPROPER INPUT VALIDATION CWE-20

An attacker sending a specially crafted packet could break the real-time
synchronization of the affected installation, which may cause a
denial-of-service condition.

CVE-2019-10923 has been assigned to this vulnerability. A CVSS v3 base score of
7.5 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/C:N/
I:N/A:H ).

3.3 BACKGROUND

  o CRITICAL INFRASTRUCTURE SECTORS: Chemical, Commercial Facilities, Critical
    Manufacturing, Energy, Food and Agriculture, Healthcare and Public Health
  o COUNTRIES/AREAS DEPLOYED: Worldwide
  o COMPANY HEADQUARTERS LOCATION: Germany

3.4 RESEARCHER

Siemens reported this vulnerability to CISA.

4. MITIGATIONS

Siemens has provided firmware updates for the following products to fix the
vulnerability:

  o CP1604/CP1616: Update to v2.8

  o Development/Evaluation Kits for PROFINET IO:

  o DK Standard Ethernet Controller: Update to v4.1.1 Patch 05

  o EK-ERTEC 200: Update to v4.5.0 Patch 01

  o EK-ERTEC 200: Update to v4.5.0 Patch 01

  o EK-ERTEC 200P: Update to v4.5.0

  o SCALANCE X-200IRT: Update to v5.4.2

  o SIMATIC WinAC RTX (F) 2010: Update to SP3 , apply BIOS and Microsoft
    Windows updates

  o SINAMICS DCM: Update to v1.5 HF1

  o SINAMICS G110M v4.7 (Control Unit): Update to v4.7 SP10 HF5

  o SINAMICS G120 v4.7 (Control Unit): Update to v4.7 SP10 HF5

  o SINAMICS G130 v4.7 (Control Unit): Update to v4.7 HF29 or upgrade to v5.2
    HF2
  o SINAMICS GH150 v4.7 (Control Unit): Upgrade to v4.8 SP2 HF9

The update can be obtained from a Siemens representative or via Siemens
customer service.

  o SINAMICS GL150 v4.7 (Control Unit): Upgrade to v4.8 SP2 HF9

The update can be obtained from a Siemens representative or via Siemens
customer service.

  o SINAMICS GM150 v4.7 (Control Unit): Upgrade to v4.8 SP2 HF9

The update can be obtained from a Siemens representative or via Siemens
customer service.

  o SINAMICS S120 v4.7 (Control Unit and CBE20): Update to v4.7 HF34 or upgrade
    to v5.2 HF2
  o SINUMERIK 828D: Update to v4.8 SP5

The update can be obtained from a Siemens representative or via Siemens
customer service.

Siemens is preparing further updates and recommends the following mitigations
until patches are available:

  o Restrict network access to Port 161/TCP of the affected product.
  o Disable SNMP in Versions 1 and 2c, if supported by the product.
  o Enable SNMP v3 if required and supported by the product to restrict the
    vulnerability to authenticated users.
  o Enable access protection and change default credentials for SNMP service,
    if possible.

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 configuring the environment
according to the Siemens operational guidelines for Industrial Security , and
following the recommendations in the product manuals.

Additional information on Industrial Security by Siemens can be found at:
https://www.siemens.com/industrialsecurity

For more information on the vulnerability and more detailed mitigation
instructions, please see Siemens Security Advisory SSA-349422 at the following
location: http://www.siemens.com/cert/advisories

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

  o Minimize network exposure for all control system devices and/or systems,
    and ensure that they are not accessible from the Internet .
  o Locate control system networks and remote devices behind firewalls, and
    isolate them from the business network.
  o 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.

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 us-cert.gov . 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 us-cert.gov 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.

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