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             AUSCERT External Security Bulletin Redistribution

                               ESB-2020.1346
 ICS Advisory (ICSA-20-105-09) Siemens TIM 3V-IE and 4R-IE Family Devices
                               17 April 2020

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

Product:           Siemens TIM 3V-IE and 4R-IE Family Devices
Publisher:         ICS-CERT
Operating System:  Network Appliance
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
                   Increased Privileges            -- Remote/Unauthenticated
                   Access Confidential Data        -- Remote/Unauthenticated
                   Reduced Security                -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-10939  

Original Bulletin: 
   https://www.us-cert.gov/ics/advisories/icsa-20-105-09

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ICS Advisory (ICSA-20-105-09)

Siemens TIM 3V-IE and 4R-IE Family Devices

Original release date: April 14, 2020

Legal Notice

All information products included in https://us-cert.gov/ics are provided"as
is" for informational purposes only. The Department of Homeland Security (DHS)
does not provide any warranties of any kind regarding any 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 https://www.us-cert.gov/tlp/ .



1. EXECUTIVE SUMMARY

  o CVSS v3 9.0
  o ATTENTION: Exploitable remotely
  o Vendor: Siemens
  o Equipment: TIM 3V-IE and 4R-IE Family Devices
  o Vulnerability: Active Debug Code

2.RISK EVALUATION

Successful exploitation of this vulnerability could allow an unauthenticated
attacker with network access to gain full control over the device.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following versions of TIM communication modules for SIMATIC S7-300 and
S7-400 devices are affected:

  o TIM 3V-IE (incl. SIPLUS NET variants): all versions prior to v2.8
  o TIM 3V-IE Advanced (incl. SIPLUS NET variants): all versions prior to v2.8
  o TIM 3V-IE DNP3 (incl. SIPLUS NET variants): all versions prior to v3.3
  o TIM 4R-IE (incl. SIPLUS NET variants): all versions prior to v2.8
  o TIM 4R-IE DNP3 (incl. SIPLUS NET variants): all versions prior to v3.3

3.2 VULNERABILITY OVERVIEW

3.2.1 ACTIVE DEBUG CODE CWE-489

The affected versions contain an open debug port that is available under
specific conditions. The vulnerability is only available if the IP address is
configured to 192.168.1.2
If available, the debug port could be exploited by an attacker with network
access to the device. No user interaction is required to exploit this
vulnerability. The vulnerability impacts confidentiality, integrity, and
availability of the affected device.

CVE-2019-10939 has been assigned to this vulnerability. A CVSS v3 base score of
9.0 has been calculated; the CVSS vector string is ( AV:N/AC:H/PR:N/UI:N/S:C/
C:H/I:H/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 reported this vulnerability to CISA.

4. MITIGATIONS

Siemens has released updates for the affected products and recommends users
update to the new version.

  o TIM 3V-IE (incl. SIPLUS NET variants) and TIM 3V-IE Advanced (incl. SIPLUS
    NET variants): Update to v2.8
  o TIM 3V-IE DNP3 (incl. SIPLUS NET variants): Update to v3.3
  o TIM 4R-IE (incl. SIPLUS NET variants): Update to v2.8
  o TIM 4R-IE DNP3 (incl. SIPLUS NET variants): Update to v3.3

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

  o Set the IP of the device to anything other than 192.168.1.2
  o Limit access to Port 17185/UDP of an affected device (e.g., cell-protection
    firewall or corporate firewall) to reduce the risk.

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 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 this vulnerability and more detailed mitigation
instructions, please see Siemens security advisory SSA-359303

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. High skill
level is needed to exploit.

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

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

CISA continuously strives to improve its products and services. You can help by
choosing one of the links below to provide feedback about this product.

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