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AUSCERT External Security Bulletin Redistribution
Advisory (icsa-22-013-05) Siemens COMOS Web
14 January 2022
AusCERT Security Bulletin Summary
Product: Siemens COMOS Web
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Cross-site Request Forgery -- Existing Account
Cross-site Scripting -- Existing Account
Reduced Security -- Existing Account
CVE Names: CVE-2021-37198 CVE-2021-37197 CVE-2021-37196
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ICS Advisory (ICSA-22-013-05)
Siemens COMOS Web
Original release date: January 13, 2022
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1. EXECUTIVE SUMMARY
o CVSS v3 8.8
o ATTENTION: Exploitable remotely/low attack complexity
o Vendor: Siemens
o Equipment: COMOS
o Vulnerabilities: Basic XSS, Relative Path Traversal, SQL Injection,
Cross-site Request Forgery
2. RISK EVALUATION
Successful exploitation of these vulnerabilities could allow an attacker to
conduct code injections, store data in undesired locations, execute arbitrary
SQL statements, and run cross-site request forgery attacks.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of COMOS Web, a unified data platform, are affected:
o COMOS: All versions prior to v10.4.1
3.2 VULNERABILITY OVERVIEW
3.2.1 IMPROPER NEUTRALIZATION OF SCRIPT-RELATED HTML TAGS IN A WEB PAGE (BASIC
The COMOS Web component of COMOS accepts arbitrary code as attachments to
tasks, which could allow an attacker to inject malicious code that is then
executed when loading the attachment.
CVE-2021-37195 has been assigned to this vulnerability. A CVSS v3 base score of
7.7 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:L/UI:N/S:C/
3.2.2 RELATIVE PATH TRAVERSAL CWE-23
The COMOS Web component of COMOS unpacks specially crafted archive files to
relative paths, which could allow an attacker to store files in any folder
accessible by the COMOS Web webservice.
CVE-2021-37196 has been assigned to this vulnerability. A CVSS v3 base score of
6.5 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:L/UI:N/S:U/
3.2.3 IMPROPER NEUTRALIZATION OF SPECIAL ELEMENTS USED IN AN SQL COMMAND ('SQL
The COMOS Web component of COMOS is vulnerable to SQL injections, which could
allow an attacker to execute arbitrary SQL statements.
CVE-2021-37197 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/
3.2.4 CROSS-SITE REQUEST FORGERY (CSRF) CWE-352
The COMOS Web component of COMOS uses a flawed implementation of CSRF
prevention, which an attacker could exploit to perform cross-site request
CVE-2021-37198 has been assigned to this vulnerability. A CVSS v3 base score of
5.4 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:L/UI:N/S:U/
o CRITICAL INFRASTRUCTURE SECTORS: Multiple Sectors
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Germany
Sandro Poppi reported these vulnerabilities to Siemens.
Siemens has released an update for COMOS and recommends users update to the
o COMOS: Update to v10.4.1
Siemens has not identified any additional specific workarounds or mitigations.
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 the Siemens operational guidelines for industrial security and
following the recommendations in the product manuals.
For additional information, please refer to Siemens Security Advisory
CISA recommends users take defensive measures to minimize the risk of
exploitation of these vulnerabilities. Specifically, users should:
o Ensure the least-privilege user principle is followed.
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 the business network.
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 on cisa.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 cisa.gov in the Technical Information Paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
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 these vulnerabilities.
For any questions related to this report, please contact the CISA at:
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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