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:
V1.3
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
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 .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.
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
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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://new.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.