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AUSCERT External Security Bulletin Redistribution
ESB-2020.3093
Advisory (icsa-20-252-03) Siemens License Management Utility
9 September 2020
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AusCERT Security Bulletin Summary
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Product: Siemens License Management Utility
Publisher: US-CERT
Operating System: Network Appliance
Impact/Access: Increased Privileges -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2020-10056
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-20-252-03
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ICS Advisory (ICSA-20-252-03)
Siemens License Management Utility
Original release date: September 08, 2020
Legal Notice
All information products included in https://us-cert.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://www.us-cert.gov/tlp/ .
1. EXECUTIVE SUMMARY
o CVSS v3 7.8
o ATTENTION: Low skill level to exploit
o Vendor: Siemens
o Equipment: License Management Utility
o Vulnerability: Execution with Unnecessary Privileges
2. RISK EVALUATION
Successful exploitation of this vulnerability could allow local users to
escalate privileges.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of License Management Utility (LMU), a license
management system, are affected:
o LMU: All versions prior to v2.4
3.2 VULNERABILITY OVERVIEW
3.2.1 EXECUTION WITH UNNECESSARY PRIVILEGES CWE-250
A specific service of the affected application is executed with local SYSTEM
privileges on the server while its configuration can be modified by local
users.
CVE-2020-10056 has been assigned to this vulnerability. A CVSS v3 base score of
7.8 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:L/UI:N/S:U/
C:H/I:H/A:H ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Commercial Facilities Sector, Government
Facilities Sector
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Germany
3.4 RESEARCHER
Bundesamt fur Sicherheit in der Informationstechnik (BSI) reported this
vulnerability to Siemens.
4. MITIGATIONS
Siemens has released an updated version ( v2.4 ) of LMU, and recommends users
install this update on all affected systems.
Siemens has identified the following specific workarounds and mitigations users
can apply to reduce risk:
o Apply security hardening of the Windows Server, where LMU is installed on,
in accordance with corporate security policies or up-to-date hardening
guidelines.
o Ensure only trusted persons have access to the system and avoid the
configuration of additional local accounts on the server.
As a general security measure, Siemens strongly recommends protecting network
access to affected products with appropriate mechanisms. It is advised to
follow recommended security practices in order to run the devices in a
protected IT environment.
For more information please see Siemens Advisory: SSA-709003
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 that VPNs may have vulnerabilities and should
be updated to the most current version available. Also recognize that VPN
is only as secure as the 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.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.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. This
vulnerability is not exploitable remotely.
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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