30 January 2018
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2018.0289 Advisory (ICSA-18-025-02) Siemens Desigo PXC 30 January 2018 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Siemens Desigo PXC Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Root Compromise -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2018-4834 Original Bulletin: https://ics-cert.us-cert.gov/advisories/ICSA-18-025-02 - --------------------------BEGIN INCLUDED TEXT-------------------- Advisory (ICSA-18-025-02) Siemens Desigo PXC Original release date: January 25, 2018 Legal Notice All information products included in http://ics-cert.us-cert.gov 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 http://www.us-cert.gov/tlp/. CVSS v3 9.8 ATTENTION: Remotely exploitable/low skill level to exploit. Vendor: Siemens Equipment: Desigo PXC Vulnerability: Improper Authentication AFFECTED PRODUCTS Siemens reports that the vulnerability affects the following versions of Desigo PXC: Desigo Automation Controllers Compact PXC12/22/36-E.D all versions prior to V6.00.204, Desigo Automation Controllers Modular PXC00/50/100/200-E.D all versions prior to V6.00.204, Desigo Automation Controllers PXC00/64/128-U with Web module all versions prior to V6.00.204, Desigo Automation Controllers for Integration PXC001-E.D all versions prior to V6.00.204, and Desigo Operator Unit PXM20-E all versions prior to V6.00.204 IMPACT Successful exploitation of this vulnerability could allow unauthenticated remote attackers to upload malicious firmware without prior authentication. MITIGATION Siemens has provided an updated version that fixes the vulnerability for the affected products and recommends users update to the newest version V6.00.204 or a later version that can be obtained at: https://support.industry.siemens.com/cs/ww/en/view/109481602 As a general security measure, Siemens strongly recommends protecting network access to the devices with appropriate mechanisms. Siemens advises configuring the environment according to Siemens operational guidelines in order to run the devices in a protected IT environment. https://www.siemens.com/cert/operational-guidelines-industrial-security For more information on this vulnerability and more detailed mitigation instructions, please see Siemens Security Advisory SSA-824231 at the following location: http://www.siemens.com/cert/en/cert-security-advisories.htm NCCIC recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should: Minimize network exposure for all control system devices and/or systems, and ensure that they are not accessible from the Internet. Locate control system networks and remote devices behind firewalls, and isolate them from the business network. 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. NCCIC reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures. NCCIC also provides a section for control systems security recommended practices on the ICS-CERT web page. 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 in the NCCIC Technical Information Paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies, that is available for download from the ICS-CERT web site. Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to NCCIC for tracking and correlation against other incidents. No known public exploits specifically target this vulnerability. VULNERABILITY OVERVIEW IMPROPER AUTHENTICATION CWE-287 A remote attacker with network access to the device could potentially upload a new firmware image to the devices without prior authentication. CVE-2018-4834 has been assigned to this vulnerability. A CVSS v3 base score of 9.8 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H). RESEARCHER Can Demirel and Melih Berk Eksioglu from Biznet Bilisim reported this vulnerability to Siemens. BACKGROUND Critical Infrastructure Sector: Commercial Facilities Countries/Areas Deployed: Worldwide Company Headquarters Location: Germany Contact Information For any questions related to this report, please contact the NCCIC at: Email: NCCICCUSTOMERSERVICE@hq.dhs.gov Toll Free: 1-888-282-0870 For industrial control systems cybersecurity information: http://ics-cert.us-cert.gov or incident reporting: https://ics-cert.us-cert.gov/Report-Incident? The NCCIC 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 email@example.com 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. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. 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: firstname.lastname@example.org 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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