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AUSCERT External Security Bulletin Redistribution
Advisory (icsa-21-040-09) SIMATIC WinCC Graphics Designer
11 February 2021
AusCERT Security Bulletin Summary
Product: SIMATIC WinCC Graphics Designer
Operating System: Network Appliance
Impact/Access: Access Confidential Data -- Existing Account
Unauthorised Access -- Existing Account
CVE Names: CVE-2020-10048
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ICS Advisory (ICSA-21-040-09)
SIMATIC WinCC Graphics Designer
Original release date: February 09, 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 6.2
o ATTENTION: Low skill level to exploit
o Vendor : Siemens
o Equipment: SIMATIC WinCC and PCS 7
o Vulnerability: Authentication Bypass Using an Alternate Path or Channel
2. RISK EVALUATION
Successful exploitation of this vulnerability could allow an attacker
unauthenticated access to protected files.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
Siemens reports this vulnerability affects WinCC Graphics Designer used with
the following DCS and SCADA products:
o SIMATIC PCS 7: All versions
o SIMATIC WinCC: All versions prior to 7.5 SP2
3.2 VULNERABILITY OVERVIEW
3.2.1 AUTHENTICATION BYPASS USING AN ALTERNATE PATH OR CHANNEL CWE-288
An attacker could bypass the password protection of protected files due to an
insecure password verification process, which may allow access to protected
content without authentication.
CVE-2020-10048 has been assigned to this vulnerability. A CVSS v3 base score of
6.2 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:N/UI:N/S:U/
o CRITICAL INFRASTRUCTURE SECTORS: Chemical, Critical Manufacturing, Energy,
Food and Agriculture, Water and Wastewater Systems
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Germany
Enrique Murias Fernandez from Tecdesoft Automation reported this vulnerability
Siemens has released an update for SIMATIC WinCC and recommends updating to the
o SIMATIC WinCC: Update to v7.5 SP2 or later
o SIMATIC PCS 7: WinCC Graphics Designer is not officially supported and not
used by PCS 7. Siemens recommends not using this feature and to apply the
measures described in SIMATIC PCS 7 Compendium Part F .
Siemens also has identified the following specific workarounds and mitigations
users can apply to reduce the risk:
o Tailor user privileges to each user's specific needs (need-to-know
o Limit access to the affected products by implementing strict access control
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 follow the recommendations
in the product manuals.
Additional information on industrial security by Siemens can be found at:
For additional information refer to SSA-944678
CISA recommends users take the following measures to protect themselves from
social engineering attacks:
o Do not click web links or open unsolicited attachments in email messages.
o Refer to Recognizing and Avoiding Email Scams for more information on
avoiding email scams.
o Refer to Avoiding Social Engineering and Phishing Attacks for more
information on social engineering attacks.
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 this vulnerability. This
vulnerability is not exploitable remotely.
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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