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# SSA-162506: DHCP Client Vulnerability in SIMOTICS CONNECT 400, Desigo PXC/PXM,
APOGEE MEC/MBC/PXC, APOGEE PXC Series, and TALON TC Series

Publication Date:        2020-04-14
Last Update:             2022-05-10
Current Version:         1.3
CVSS v3.1 Base Score:    7.1

SUMMARY
=======

SIMOTICS CONNECT 400, Desigo (Power PC-based), APOGEE MEC/MBC/PXC and
TALON TC products are affected by a DHCP Client vulnerability as
initially reported in SSA-434032 for the Mentor Nucleus Networking
Module.

Siemens has released updates for several affected products and
recommends to update to the latest versions. Siemens recommends specific
countermeasures for products where updates are not, or not yet
available.


AFFECTED PRODUCTS AND SOLUTION
==============================


* APOGEE MEC/MBC/PXC (P2)
  - Affected versions:
       All versions < V2.8.2
  - Remediation:
       Currently no fix is planned
       Use static IP address configuration
       See further recommendations from section "Workarounds and Mitigations"

* APOGEE PXC Series (BACnet)
  - Affected versions:
       All versions < V3.5.3
  - Remediation:
       Update to V3.5.3 or later version
       See further recommendations from section "Workarounds and Mitigations"

* APOGEE PXC Series (P2)
  - Affected versions:
       All versions >= V2.8.2 and < V2.8.19
  - Remediation:
       Update to V2.8.19 or later version
       See further recommendations from section "Workarounds and Mitigations"

* Desigo PXC00-E.D
  - Affected versions:
       All versions >= V2.3x and < V6.00.327
  - Remediation:
       Update to V6.00.327 or later version
       See further recommendations from section "Workarounds and Mitigations"
  - Download:
       https://support.industry.siemens.com/cs/ww/en/view/109791941/

* Desigo PXC00-U
  - Affected versions:
       All versions >= V2.3x and < V6.00.327
  - Remediation:
       Update to V6.00.327 or later version
       See further recommendations from section "Workarounds and Mitigations"
  - Download:
       https://support.industry.siemens.com/cs/ww/en/view/109791941/

* Desigo PXC001-E.D
  - Affected versions:
       All versions >= V2.3x and < V6.00.327
  - Remediation:
       Update to V6.00.327 or later version
       See further recommendations from section "Workarounds and Mitigations"
  - Download:
       https://support.industry.siemens.com/cs/ww/en/view/109791941/

* Desigo PXC12-E.D
  - Affected versions:
       All versions >= V2.3x and < V6.00.327
  - Remediation:
       Update to V6.00.327 or later version
       See further recommendations from section "Workarounds and Mitigations"
  - Download:
       https://support.industry.siemens.com/cs/ww/en/view/109791941/

* Desigo PXC22-E.D
  - Affected versions:
       All versions >= V2.3x and < V6.00.327
  - Remediation:
       Update to V6.00.327 or later version
       See further recommendations from section "Workarounds and Mitigations"
  - Download:
       https://support.industry.siemens.com/cs/ww/en/view/109791941/

* Desigo PXC22.1-E.D
  - Affected versions:
       All versions >= V2.3x and < V6.00.327
  - Remediation:
       Update to V6.00.327 or later version
       See further recommendations from section "Workarounds and Mitigations"
  - Download:
       https://support.industry.siemens.com/cs/ww/en/view/109791941/

* Desigo PXC36.1-E.D
  - Affected versions:
       All versions >= V2.3x and < V6.00.327
  - Remediation:
       Update to V6.00.327 or later version
       See further recommendations from section "Workarounds and Mitigations"
  - Download:
       https://support.industry.siemens.com/cs/ww/en/view/109791941/

* Desigo PXC50-E.D
  - Affected versions:
       All versions >= V2.3x and < V6.00.327
  - Remediation:
       Update to V6.00.327 or later version
       See further recommendations from section "Workarounds and Mitigations"
  - Download:
       https://support.industry.siemens.com/cs/ww/en/view/109791941/

* Desigo PXC64-U
  - Affected versions:
       All versions >= V2.3x and < V6.00.327
  - Remediation:
       Update to V6.00.327 or later version
       See further recommendations from section "Workarounds and Mitigations"
  - Download:
       https://support.industry.siemens.com/cs/ww/en/view/109791941/

* Desigo PXC100-E.D
  - Affected versions:
       All versions >= V2.3x and < V6.00.327
  - Remediation:
       Update to V6.00.327 or later version
       See further recommendations from section "Workarounds and Mitigations"
  - Download:
       https://support.industry.siemens.com/cs/ww/en/view/109791941/

* Desigo PXC128-U
  - Affected versions:
       All versions >= V2.3x and < V6.00.327
  - Remediation:
       Update to V6.00.327 or later version
       See further recommendations from section "Workarounds and Mitigations"
  - Download:
       https://support.industry.siemens.com/cs/ww/en/view/109791941/

* Desigo PXC200-E.D
  - Affected versions:
       All versions >= V2.3x and < V6.00.327
  - Remediation:
       Update to V6.00.327 or later version
       See further recommendations from section "Workarounds and Mitigations"
  - Download:
       https://support.industry.siemens.com/cs/ww/en/view/109791941/

* Desigo PXM20-E
  - Affected versions:
       All versions >= V2.3x and < V6.00.327
  - Remediation:
       Update to V6.00.327 or later version
       See further recommendations from section "Workarounds and Mitigations"
  - Download:
       https://support.industry.siemens.com/cs/ww/en/view/109791941/

* SIMOTICS CONNECT 400
  - Affected versions:
       All versions < V0.3.0.330
  - Remediation:
       Update to V0.3.0.330 or later version
       See further recommendations from section "Workarounds and Mitigations"
  - Download:
       https://support.industry.siemens.com/cs/ww/en/view/109778383/

* TALON TC Series (BACnet)
  - Affected versions:
       All versions < V3.5.3
  - Remediation:
       Update to V3.5.3 or later version
       See further recommendations from section "Workarounds and Mitigations"


WORKAROUNDS AND MITIGATIONS
===========================

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

* Disable the DHCP client and use static IP address configuration instead
(Note that the DHCP client is disabled by default on APOGEE/TALON and
Desigo products.)

* APOGEE MEC, MBC, PXC (versions prior to V2.8.2): Use static IP address
configuration as described above

* APOGEE PXC Series and TALON TC Series products: If using static IP
address is not possible, update to the fix version listed above or
contact your local Siemens office for support


Product specific remediations or mitigations can be found in the section
"Affected Products and Solution".

Please follow the "General Security Recommendations".


GENERAL SECURITY RECOMMENDATIONS
================================

As a general security measure, Siemens strongly recommends to protect
network access to devices with appropriate mechanisms. In order to
operate the devices in a protected IT environment, Siemens recommends to
configure the environment according to Siemens' operational guidelines
for Industrial Security (Download:
https://www.siemens.com/cert/operational-guidelines-industrial-security),
and to follow the recommendations in the product manuals.

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

PRODUCT DESCRIPTION
===================

SIMOTICS CONNECT 400 is a connector and sensor box, mounted on
low-voltage motors to provide analytics data for the MindSphere
application SIDRIVE IQ Fleet.

The APOGEE MEC (Modular Equipement Controller), MBC (Modular Building
Controller), and PXC are Direct Digital Control (DDC) devices and an
integral part of the APOGEE Automation System. These are legacy devices,
replaced by the APOGEE PXC Modular and Compact Series.

The APOGEE PXC Modular and Compact Series are high-performance Direct
Digital Control (DDC) devices and an integral part of the APOGEE
Automation System.

The Desigo PX automation stations and operator units control and monitor
building automation systems. They allow for alarm signaling, time-based
programs and trend logging.

The TALON TC Modular and Compact Series are high-performance Direct
Digital Control (DDC) devices and an integral part of the TALON
Automation System.

VULNERABILITY CLASSIFICATION
============================

The vulnerability classification has been performed by using the CVSS scoring
system in version 3.1 (CVSS v3.1) (https://www.first.org/cvss/). The CVSS
environmental score is specific to the customer's environment and will impact
the overall CVSS score. The environmental score should therefore be
individually defined by the customer to accomplish final scoring.

An additional classification has been performed using the CWE classification, a
community-developed list of common software security weaknesses. This serves as
a common language and as a baseline for weakness identification, mitigation,
and prevention efforts. A detailed list of CWE classes can be found at:
https://cwe.mitre.org/.



* Vulnerability CVE-2019-13939

  By sending specially crafted DHCP packets to a device where the DHCP
  client is enabled, an attacker could change the IP address of the device
  to an invalid value.
  
  The vulnerability could affect availability and integrity of the device.
  Adjacent network access is required, but no authentication and no user
  interaction is needed to conduct an attack.

  CVSS v3.1 Base Score: 7.1
  CVSS Vector:          CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H/E:P/RL:O/RC:C
  CWE:                  CWE-840: Business Logic Errors




ADDITIONAL INFORMATION
======================
Products listed in this advisory are based on Mentor Nucleus NET. See
SSA-434032 for the related security advisory.

For further inquiries on security vulnerabilities in Siemens products and
solutions, please contact the Siemens ProductCERT:

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


HISTORY DATA
============

V1.0 (2020-04-14): Publication Date
V1.1 (2021-01-12): Added solution for Desigo PXC and PXM20
V1.2 (2022-04-12): Listed all affected Desigo PXC and PXM20 products explicitly. Added
solution for APOGEE PXC Series (BACnet) and TALON TC Series (BACnet)
V1.3 (2022-05-10): Added solution for APOGEE PXC Series (P2)

TERMS OF USE
============

Siemens Security Advisories are subject to the terms and conditions contained
in Siemens' underlying license terms or other applicable agreements previously
agreed to with Siemens (hereinafter "License Terms"). To the extent applicable
to information, software or documentation made available in or through a
Siemens Security Advisory, the Terms of Use of Siemens' Global Website
(https://www.siemens.com/terms_of_use, hereinafter "Terms of Use"), in
particular Sections 8-10 of the Terms of Use, shall apply additionally. In case
of conflicts, the License Terms shall prevail over the Terms of Use.

Copyright: Siemens 2022
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