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AUSCERT External Security Bulletin Redistribution
ESB-2022.5098
Advisory (icsa-22-286-06) Siemens Desigo PXM Devices
14 October 2022
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AusCERT Security Bulletin Summary
---------------------------------
Product: Desigo PXM Devices
Publisher: ICS-CERT
Operating System: Network Appliance
Resolution: Patch/Upgrade
CVE Names: CVE-2022-40182 CVE-2022-40181 CVE-2022-40180
CVE-2022-40179 CVE-2022-40178 CVE-2022-40177
CVE-2022-40176
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-22-286-06
Comment: CVSS (Max): 8.8 CVE-2022-40182 (CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
CVSS Source: ICS-CERT
Calculator: https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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ICS Advisory (ICSA-22-286-06)
Siemens Desigo PXM Devices
Original release date: October 13, 2022
Legal Notice
All information products included in https://us-cert.cisa.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://us-cert.cisa.gov/tlp/ .
1. EXECUTIVE SUMMARY
o CVSS v3 8.8
o ATTENTION: Exploitable remotely/low attack complexity
o Vendor: Siemens
o Equipment: Desigo PXM Devices
o Vulnerabilities: OS Command Injection, Exposure of Sensitive Information to
an Unauthorized Actor, Cross-Site Scripting, Cross-Site Request Forgery,
Improper Neutralization of Encoded URI Schemes in a Web Page, Execution
with Unnecessary Privileges
2. RISK EVALUATION
Successful exploitation of these vulnerabilities could allow an attacker to
potentially access sensitive information, execute arbitrary commands, cause a
denial-of-service condition, or perform remote code execution.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following Desigo devices contain the affected webserver:
o Desigo PXM30-1: All versions prior to V02.20.126.11-41
o Desigo PXM30.E: All versions prior to V02.20.126.11-41
o Desigo PXM40-1: All versions prior to V02.20.126.11-41
o Desigo PXM40.E: All versions prior to V02.20.126.11-41
o Desigo PXM50-1: All versions prior to V02.20.126.11-41
o Desigo PXM50.E: All versions prior to V02.20.126.11-41
o PXG3.W100-1: All versions prior to V02.20.126.11-37
o PXG3.W100-2: All versions prior to V02.20.126.11-41
o PXG3.W200-1: All versions prior to V02.20.126.11-37
o PXG3.W200-2: All versions prior to V02.20.126.11-41
3.2 VULNERABILITY OVERVIEW
3.2.1 IMPROPER NEUTRALIZATION OF SPECIAL ELEMENTS USED IN AN OS COMMAND ('OS
COMMAND INJECTION') CWE-78
Siemens Desigo PXM Devices' webserver is vulnerable to OS command injection. An
improper neutralization of special elements used in an OS Command with root
privileges during a restore operation exists; validation of file names included
in the input package are missing. By restoring a specifically crafted package,
a remote low-privileged attacker could execute arbitrary system commands with
root privileges on the device, potentially leading to a full compromise.
CVE-2022-40176 has been assigned to this vulnerability. A CVSS v3 base score of
8.0 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:L/UI:R/S:U/
C:H/I:H/A:H ).
3.2.2 EXPOSURE OF SENSITIVE INFORMATION TO AN UNAUTHORIZED ACTOR CWE-200
Siemens Desigo PXM Devices' webserver is vulnerable to exposure of sensitive
information to an unauthorized actor. Endpoints of the "Operation" web
application that interpret and execute Axon language queries allow file read
access to the device file system with root privileges. By supplying specific
input/output (I/O) related Axon queries, a remote low-privileged attacker could
read sensitive files on the device.
CVE-2022-40177 has been assigned to this vulnerability. A CVSS v3 base score of
5.7 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:L/UI:R/S:U/
C:H/I:N/A:N ).
3.2.3 IMPROPER NEUTRALIZATION OF INPUT DURING WEB PAGE GENERATION ('CROSS-SITE
SCRIPTING') CWE-79
Siemens Desigo PXM Devices' webserver is vulnerable to improper neutralization
of input during webpage generation in the "Import Files" functionality of the
"Operation" web application, due to the missing validation of file titles
included in the input package. By uploading a specifically crafted graphics
package, a remote low-privileged attacker could execute arbitrary JavaScript
code.
CVE-2022-40178 has been assigned to this vulnerability. A CVSS v3 base score of
4.8 has been calculated; the CVSS vector string is ( AV:N/AC:H/PR:L/UI:R/S:U/
C:H/I:N/A:N ).
3.2.4 CROSS-SITE REQUEST FORGERY (CSRF) CWE-352
Siemens Desigo PXM Devices' webserver is vulnerable to a CSRF in endpoints of
the "Operation" web application that interpret and execute Axon language
queries, due to the missing validation of anti-CSRF tokens or other origin
checks. By convincing a victim to click on a malicious link or visit a
specifically crafted web page while logged-in to the device web application, a
remote unauthenticated attacker could execute arbitrary Axon queries against
the device.
CVE-2022-40179 has been assigned to this vulnerability. A CVSS v3 base score of
6.8 has been calculated; the CVSS vector string is ( AV:N/AC:H/PR:N/UI:R/S:U/
C:H/I:H/A:N ).
3.2.5 CROSS-SITE REQUEST FORGERY (CSRF) CWE-352
Siemens Desigo PXM Devices' webserver is vulnerable to a CSRF in the "Import
Files" functionality of the "Operation" web application due to the missing
validation of anti-CSRF tokens or other origin checks. By convincing a victim
to visit a specially crafted web page while logged-in to the device's web
application, a remote unauthenticated attacker could upload and enable
permanent arbitrary JavaScript code to the device.
CVE-2022-40180 has been assigned to this vulnerability. A CVSS v3 base score of
5.3 has been calculated; the CVSS vector string is ( AV:N/AC:H/PR:N/UI:R/S:U/
C:N/I:H/A:N ).
3.2.6 IMPROPER NEUTRALIZATION OF ENCODED URI SCHEMES IN A WEB PAGE CWE-84
Siemens Desigo PXM Devices' webserver is vulnerable to improper neutralization
of encoded URL schemes in a web page. The device's embedded browser does not
prevent interaction with alternative URI schemes when redirected to
corresponding resources by web application code. By setting the homepage URI,
the favorite URIs, or redirecting embedded browser users via JavaScript code to
alternative scheme resources, a remote low privileged attacker could perform a
range of attacks against the device, such as reading arbitrary files on the
filesystem, executing arbitrary JavaScript code to steal or manipulate
displayed information, or triggering denial-of-service conditions
CVE-2022-40181 has been assigned to this vulnerability. A CVSS v3 base score of
8.3 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:L/UI:N/S:U/
C:H/I:L/A:H ).
3.2.7 EXECUTION WITH UNNECESSARY PRIVILEGES CWE-250
Siemens Desigo PXM Devices' webserver is vulnerable to execution with
unnecessary privileges. The device launches the embedded Chromium-based browser
as root with the "-no-sandbox" option. Attackers could add arbitrary JavaScript
code inside the "Operation" graphics and successfully exploit publicly known
vulnerabilities against the version of the embedded Chromium-based browser.
CVE-2022-40182 has been assigned to this vulnerability. A CVSS v3 base score of
8.8 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:L/UI:N/S:U/
C:H/I:H/A:H ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Germany
3.4 RESEARCHER
Siemens reported these vulnerabilities to CISA.
4. MITIGATIONS
Siemens has released updates for the affected products and recommends users
update to the latest versions:
o Desigo PXM30-1: Update to V02.20.126.11-41 or later
o Desigo PXM30.E: Update to V02.20.126.11-41 or later
o Desigo PXM40-1: Update to V02.20.126.11-41 or later
o Desigo PXM40.E: Update to V02.20.126.11-41 or later
o Desigo PXM50-1: Update to V02.20.126.11-41 or later
o Desigo PXM50.E: Update to V02.20.126.11-41 or later
o PXG3.W100-1: Update to V02.20.126.11-37 or later
o PXG3.W100-2: Update to V02.20.126.11-41 or later
o PXG3.W200-1: Update to V02.20.126.11-37 or later
o PXG3.W200-2: Update to V02.20.126.11-41 or later
As a general security measure, Siemens recommends protecting network access to
devices with appropriate mechanisms. To operate the devices in a protected IT
environment, Siemens recommends configuring the environment according to
Siemens' operational guidelines for industrial security and following
recommendations in the product manuals.
Additional information on industrial security by Siemens can be found on the
Siemens industrial security webpage .
For more information, see the associated Siemens Security Advisory in HTML or
CSAF formats.
CISA recommends users take defensive measures to minimize the risk of
exploitation of this vulnerability these vulnerabilities. Specifically, users
should:
o Minimize network exposure for all control system devices and/or systems,
and ensure they are not accessible from the Internet .
o Locate control system networks and remote devices behind firewalls and
isolate them from business networks.
o When remote access is required, use secure methods, such as Virtual Private
Networks (VPNs), recognizing VPNs may have vulnerabilities and should be
updated to the most current version available. Also recognize VPN is only
as secure as its 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 at cisa.gov/ics . Several CISA products detailing cyber
defense best 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 at cisa.gov/ics in the technical information paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Strategies .
Organizations observing suspected malicious activity should follow established
internal procedures and report findings to CISA for tracking and correlation
against other incidents.
No known public exploits specifically target these vulnerabilities.
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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