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AUSCERT External Security Bulletin Redistribution
Advisory (icsa-21-210-02) Wibu-Systems CodeMeter Runtime
30 July 2021
AusCERT Security Bulletin Summary
Product: Wibu-Systems CodeMeter Runtime
Operating System: Windows
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Denial of Service -- Remote/Unauthenticated
Access Confidential Data -- Remote/Unauthenticated
CVE Names: CVE-2021-20094 CVE-2021-20093
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ICS Advisory (ICSA-21-210-02)
Wibu-Systems CodeMeter Runtime
Original release date: July 29, 2021
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 9.1
o ATTENTION: Exploitable remotely/low attack complexity
o Vendor: Wibu-Systems AG
o Equipment: CodeMeter Runtime
o Vulnerabilities: Buffer Over-read
2. RISK EVALUATION
Successful exploitation of these vulnerabilities could allow an attacker to
read data from the heap of the CodeMeter Runtime network server, or crash the
CodeMeter Runtime Server (i.e., CodeMeter.exe).
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of CodeMeter Runtime, a license manager, are affected:
o CodeMeter Runtime: All versions prior to v7.21a
This license manager is used in the products of many different vendors.
3.2 VULNERABILITY OVERVIEW
3.2.1 BUFFER OVER-READ CWE-126
An attacker could send a specially crafted packet to the CodeMeter Runtime
CmWAN server to cause a denial-of-service condition.
CVE-2021-20094 has been assigned to this vulnerability. A CVSS v3 base score of
7.5 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/
3.2.2 BUFFER OVER-READ CWE-126
An attacker could send a specially crafted packet that could crash the server
or direct the CodeMeter Runtime Network Server to send back packets containing
data from the heap.
CVE-2021-20093 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:N/UI:N/S:U/
o CRITICAL INFRASTRUCTURE SECTORS: Multiple
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Germany
Tenable, Inc., reported these vulnerabilities to CISA.
Wibu-Systems recommends the following mitigations:
o Update to Version 7.21a or later.
o Run CodeMeter as client only and use localhost as binding for the CodeMeter
communication. With binding to localhost an attack is no longer possible
via remote network connection. The network server is disabled by default.
o If it is not possible to disable the network server, using a host-based
firewall to restrict access to the CmLAN port can reduce the risk.
o The CmWAN server is disabled by default. Check if CmWAN is enabled and
disable the feature if it is not needed.
o Run the CmWAN server only behind a reverse proxy with user authentication
to prevent attacks from unauthenticated users.
o The risk of an unauthenticated attacker can be further reduced by using a
host-based firewall that only allows the reverse proxy to access the CmWAN
For more information on this issue, please see Wibu security advisories:
WIBU-210423-01 , WIBU-210423-02
For more information on products dependent on the affected CodeMeter see the
following vendor security advisories. As new instances are discovered/reported,
they will be added to this list:
o Siemens: SSA-675303
CISA recommends users take defensive measures to minimize the risk of
exploitation of this vulnerability. Specifically, users should:
o Minimize network exposure for all control system devices and/or systems,
and ensure that 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 us-cert.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 us-cert.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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