ICS Advisory (ICSA-21-350-07)

Siemens POWER METER SICAM Q100

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1. EXECUTIVE SUMMARY

  • CVSS v3 9.1
  • ATTENTION: Exploitable remotely/low attack complexity
  • Vendor: Siemens
  • Equipment: POWER METER SICAM Q100
  • Vulnerability: Stack-based Buffer Overflow\

2. RISK EVALUATION

Successful exploitation of this vulnerability could allow an attacker to remotely execute code.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following versions of the POWER METER SICAM Q100 power monitoring device, are affected:

  • POWER METER SICAM Q100 (7KG9501-0AA01-0AA1, 7KG9501-0AA01-2AA1, 7KG9501-0AA31-0AA1, 7KG9501-0AA31-2AA1): All versions prior to v2.41

3.2 VULNERABILITY OVERVIEW

3.2.1    STACK-BASED BUFFER OVERFLOW CWE-121

The affected firmware contains a buffer overflow vulnerability in the web application that could allow a remote attacker with engineer or admin privileges to potentially perform remote code execution.

CVE-2021-44165 has been assigned to this vulnerability. A CVSS v3 base score of 9.1 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H).

3.3 BACKGROUND

  • CRITICAL INFRASTRUCTURE SECTORS: Multiple
  • COUNTRIES/AREAS DEPLOYED: Worldwide
  • COMPANY HEADQUARTERS LOCATION: Germany

3.4 RESEARCHER

Michael Messner of Siemens Energy reported this vulnerability to CISA.

4. MITIGATIONS

Siemens recommends the following:

  • Update to v2.41 or later version
  • Restrict access to the web server, e.g., with a firewall, and ensure that the privileged accounts are protected by strong passwords.

As a general security measure, Siemens strongly 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 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 see Siemens Security Advisory SSA-496292

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 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.


Contact Information

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

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

For industrial control systems cybersecurity information:  https://us-cert.cisa.gov/ics 
or incident reporting:  https://us-cert.cisa.gov/report

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