ESB-2019.1205 - [Appliance] SIMATIC, SINEC-NMS, SINEMA, SINEMURIK Industrial Control: Denial of service - Remote/unauthenticated 2019-04-10

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2019.1205
                  Siemens Industrial Products with OPC UA
                               10 April 2019

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

Product:           Siemens SIMATIC
                   Siemens SINEC-NMS
                   Siemens SINEMA
                   Siemens SINEMURIK Industrial Control
Publisher:         ICS-CERT
Operating System:  Network Appliance
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-6575  

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-19-099-03

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Advisory (ICSA-19-099-03)

Siemens Industrial Products with OPC UA

Original release date: April 09, 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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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: SIMATIC, SINEC-NMS, SINEMA, SINEMURIK Industrial Control
    Products with OPC UA
  o Vulnerability: Uncaught Exception

2. RISK EVALUATION

Successful exploitation of this vulnerability could cause a denial-of-service
condition on the affected service or device.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following Siemens industrial products are affected:

  o SIMATIC CP443-1 OPC UA, all versions
  o SIMATIC ET200 Open Controller CPU 1515SP PC2, all versions
  o SIMATIC IPC DiagMonitor, all versions
  o SIMATIC NET PC Software, all versions
  o SIMATIC RF188C, all versions
  o SIMATIC RF600R, all versions
  o SIMATIC S7-1500 CPU Family, v2.5 and prior
  o SIMATIC S7-1500 Software Controller, v2.5 and prior
  o SIMATIC WinCC OA, all versions prior to v3.15-P018
  o SIMATIC WinCC Runtime Advanced, all versions
  o SIMATIC WinCC Runtime Comfort, all versions
  o SIMATIC WinCC Runtime HSP Comfort, all versions
  o SIMATIC WinCC Runtime Mobile, all versions
  o SINEC-NMS, all versions
  o SINEMA Server, all versions
  o SINUMERIK OPC UA Server, all versions prior to v2.1
  o TeleControl Server Basic, all versions

3.2 VULNERABILITY OVERVIEW

3.2.1 UNCAUGHT EXCEPTION CWE-248

Specially crafted network packets sent to affected devices on Port 4840/TCP
could allow an unauthenticated remote attacker to cause a denial-of-service
condition in the OPC communication or crash the device.

An attacker with network access to the affected systems could exploit the
vulnerability. Successful exploitation requires no system privileges and no
user interaction. An attacker could use the vulnerability to compromise
availability of the OPC communication.

CVE-2019-6575 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, Critical Manufacturing, Energy,
    Food and Agriculture, Water and Wastewater Systems
  o COUNTRIES/AREAS DEPLOYED: Worldwide
  o COMPANY HEADQUARTERS LOCATION: Germany

3.4 RESEARCHER

Siemens ProductCERT reported this vulnerability to NCCIC.

4. MITIGATIONS

Siemens currently has updates for the following products:

  o SIMATIC WinCC OA: Update to v3.15-P018

https://www.winccoa.com/news/detail/new-patch-p018-available-for-315.html 
(logon required)

  o SINUMERIK OPC UA Server: Update to v2.1 or newer

https://support.industry.siemens.com/cs/ww/en/view/109746207

For the balance of the listed products, Siemens is preparing further updates
and recommends users apply the following specific workarounds and mitigations
to reduce risk until patches are available:

  o Deactivate the OPC UA Service if supported by the product.
  o Apply cell protection concept.
  o Use VPN for protecting network communication between cells.
  o Apply defense in depth.

Siemens recommends users configure their environment according to Siemens'
operational guidelines for Industrial Security ( Download ) and follow 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-307392 at the following
location:

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

NCCIC 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.

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.

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