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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.0503 Advisory (icsa-21-040-09) SIMATIC WinCC Graphics Designer 11 February 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: SIMATIC WinCC Graphics Designer Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Access Confidential Data -- Existing Account Unauthorised Access -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2020-10048 Original Bulletin: https://us-cert.cisa.gov/ics/advisories/icsa-21-040-09 - --------------------------BEGIN INCLUDED TEXT-------------------- ICS Advisory (ICSA-21-040-09) SIMATIC WinCC Graphics Designer Original release date: February 09, 2021 Legal Notice 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/ C:H/I:N/A:N ). 3.3 BACKGROUND 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 3.4 RESEARCHER Enrique Murias Fernandez from Tecdesoft Automation reported this vulnerability to Siemens. 4. MITIGATIONS Siemens has released an update for SIMATIC WinCC and recommends updating to the latest version. 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 principle). o Limit access to the affected products by implementing strict access control mechanisms. 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: https://www.siemens.com/industrialsecurity 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 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. - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. 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It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: https://www.auscert.org.au/bulletins/ =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). 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