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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2022.2356 Advisory (icsa-22-132-06) Siemens SIMATIC WinCC 13 May 2022 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Siemens SIMATIC WinCC Publisher: ICS-CERT Operating System: Network Appliance Resolution: Patch/Upgrade CVE Names: CVE-2022-24287 Original Bulletin: https://us-cert.cisa.gov/ics/advisories/icsa-22-132-06 Comment: CVSS (Max): 7.8 CVE-2022-24287 (CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) CVSS Source: ICS-CERT Calculator: https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - --------------------------BEGIN INCLUDED TEXT-------------------- ICS Advisory (ICSA-22-132-06) Siemens SIMATIC WinCC Original release date: May 12, 2022 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 7.8 o ATTENTION: Low attack complexity o Vendor: Siemens o Equipment: SIMATIC PCS, WinCC o Vulnerability: Insecure Default Initialization of Resource 2. RISK EVALUATION Successful exploitation of this vulnerability could allow authenticated attackers to escape the kiosk mode. 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS The following Siemens products are affected: o SIMATIC PCS 7 v9.0: All versions o SIMATIC PCS 7 v9.1: All versions o SIMATIC WinCC Runtime Professional v16: All versions o SIMATIC WinCC Runtime Professional v17: All versions o SIMATIC WinCC v7.4: All versions o SIMATIC WinCC v7.5: All versions prior to 7.5 SP2 Update 8 3.2 VULNERABILITY OVERVIEW 3.2.1 INSECURE DEFAULT INITIALIZATION OF RESOURCE CWE-1188 An authenticated attacker could escape the WinCC kiosk mode by opening the printer dialog in the affected application if no printer is installed. CVE-2022-24287 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: Multiple Sectors o COUNTRIES/AREAS DEPLOYED: Worldwide o COMPANY HEADQUARTERS LOCATION: Germany 3.4 RESEARCHER Siemens reported this vulnerability to CISA. 4. MITIGATIONS Siemens recommends updating their software to the latest version: o SIMATIC PCS 7 v9.0: No fix currently planned o SIMATIC PCS 7 v9.1: Update to v7.5 SP2 Update 8 or later (No fix currently available) o SIMATIC WinCC Runtime Professional v16: No fix currently planned o SIMATIC WinCC Runtime Professional v17: No fix currently planned o SIMATIC WinCC v7.4: No fix currently planned o SIMATIC WinCC v7.5: Update to v7.5 SP2 Update 8 or later Siemens has identified the following specific workarounds and mitigations users can apply to reduce the risk: o At least one default printer (but not a file-based printer, as e.g., PDF/ XPS printer) should be installed on the affected system o No file-based printer (e.g. PDF/XPS printers) should be installed on the affected system o Harden the application's host to prevent local access by untrusted personnel As a general security measure, Siemens 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 recommendations in the product manuals. For additional information, please refer to Siemens Security Advisory SSA-363107 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. CISA also 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. 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. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. 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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). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: https://auscert.org.au/gpg-key/ iQIVAwUBYn2R48kNZI30y1K9AQhulA//WjNI+DfEmMZubA45ar3AcHg/irgZFf/l hcembXN9cEDDtNRlq/4DTKlrjtPB5pl+dsB5t2dP2I/JRNqvSGWkCR4mCzr3sQoy DS7Xle0L0WlUzkXYNcgDAMO/CwNPOt1LD2iYfHAXEkZVmkP1gKM+x042Y75M8Omv aGSEVEplldwWAOlME/isUnstwro8aLRUbqEfMvC8pEjioWkp7C7yZNqbLweuxdmn qOaaV+C/18J6CYVY08Qual8lSUCX5s5CPEmUtoNvmgKj8VmOGoV6dUhXlCg90x4n +KgCsuraCAJAjJPGEIqwOK2YfRgy+eYa0b503dht6LibCjimcH4Mo4fIUvlpVC+q gF44wbtvG8NjhiPcrGVdG8rK+yNQwR9gp0JkrkESu367OmGF5IIfrl7XcwHsJTEM wBDRxHvES9kmV5EG42Dm1Ul4Psm1FA4TCNCTxNIUmnZdpB41UZUY6b8DN/OQzZ9J 9tYWWYgHTwMfVIKsqUsBi9GRyGZccPZh2xmRoucmyekpeWvrwLXkFkK7UMPr2+fA hTT9gA5bCsQlrVZtagSe1tbFIT1ozw94cjjCbFeTEDRS6m9SaiHmPBTVRYlT1wxs K1xs861bRd1/8Mhil08j47GvxvrtwQnpcP4vDfHN6PNyL9O6WH/akVjUVYPWviNJ Fu9nlcT/jZA= =8Z9/ -----END PGP SIGNATURE-----