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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2017.3076 Advisory (ICSA-17-334-01)Siemens SWT3000 1 December 2017 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Siemens SWT3000 Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Administrator Compromise -- Remote/Unauthenticated Denial of Service -- Remote/Unauthenticated Access Confidential Data -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2016-7114 CVE-2016-7113 CVE-2016-7112 CVE-2016-4785 CVE-2016-4784 Reference: ESB-2017.1708 ESB-2017.1707.3 ESB-2016.2101 ESB-2016.1281 Original Bulletin: https://ics-cert.us-cert.gov/advisories/ICSA-17-334-01 - --------------------------BEGIN INCLUDED TEXT-------------------- Advisory (ICSA-17-334-01) Siemens SWT3000 Original release date: November 30, 2017 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 5.3 ATTENTION: Remotely exploitable/low skill level to exploit. Vendor: Siemens Equipment: SWT3000 Vulnerabilities: Improper Authentication, Authentication Bypass, Improper Input Validation. AFFECTED PRODUCTS Siemens reports that the vulnerabilities affect the following SWT 3000 Teleprotection system products: EN100 for SWT3000 (iSWT3000): IEC 61850 firmware: All versions prior to V4.29.01 TPOP firmware: All versions prior to V01.01.00 IMPACT Successful exploitation of these vulnerabilities under certain conditions may allow attackers to perform a denial-of-service attack. MITIGATION Siemens has provided updated firmware that fixes the vulnerabilities for the following affected products and recommends users update to the newest version: SWT3000: IEC61850 firmware: Update to V4.29.01 TPOP firmware: Update to V01.01.00 To obtain the firmware please contact the Customer Support Center: support.energy@siemens.com (link sends e-mail) Siemens recommends users protect network access with appropriate mechanisms. Siemens also advises that users configure the operational environment according to Siemens Operational Guidelines for Industrial Security: https://www.siemens.com/cert/operational-guidelines-industrial-security (link is external) Please note that not all of the devices above are affected by all vulnerabilities. For more information on these vulnerabilities and more detailed mitigation instructions, please see Siemens Security Advisory SSA-350846 at the following location: http://www.siemens.com/cert/advisories (link is external) NCCIC/ICS-CERT recommends that users take defensive measures to minimize the risk of exploitation of these vulnerabilities. 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. ICS-CERT reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures. ICS-CERT 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 ICSCERT 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 ICS-CERT for tracking and correlation against other incidents. In addition, ICS-CERT recommends that users take the following measures to protect themselves from social engineering attacks: Do not click web links or open unsolicited attachments in email messages. Refer to Recognizing and Avoiding Email Scams for more information on avoiding email scams. Refer to Avoiding Social Engineering and Phishing Attacks for more information on social engineering attacks. No known public exploits specifically target these vulnerabilities. VULNERABILITY OVERVIEW IMPROPER AUTHENTICATION CWE-287 The integrated web server (Port 80/TCP) of the affected devices could allow remote attackers to obtain sensitive device information if network access was obtained. SWT3000 with TPOP is not affected by this vulnerability. CVE-2016-4784 has been assigned to this vulnerability. A CVSS v3 base score of 5.3 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N). IMPROPER AUTHENTICATION CWE-287 The integrated web server (Port 80/TCP) of the affected devices could allow remote attackers to obtain a limited amount of device memory content if network access was obtained. SWT3000 with TPOP is not affected by this vulnerability. CVE-2016-4785 has been assigned to this vulnerability. A CVSS v3 base score of 5.3 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N). AUTHENTICATION BYPASS USING AN ALTERNATE PATH OR CHANNEL CWE-288 Attackers with network access to the devices web interface (Port 80/TCP) could possibly circumvent authentication and perform certain administrative operations. CVE-2016-7112 has been assigned to this vulnerability. A CVSS v3 base score of 5.3 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N). IMPROPER INPUT VALIDATION CWE-20 Specially crafted packets sent to Port 80/TCP could cause the affected EN100 module of the SWT3000 to go into defect mode. CVE-2016-7113 has been assigned to this vulnerability. A CVSS v3 base score of 5.3 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L). AUTHENTICATION BYPASS USING AN ALTERNATE PATH OR CHANNEL CWE-288 Attackers with network access to the devices web interface (Port 80/TCP) could possibly circumvent authentication and perform certain administrative operations. A legitimate user must be logged into the web interface for the attack to be successful. CVE-2016-7114 has been assigned to this vulnerability. A CVSS v3 base score of 4.3 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N). RESEARCHER Siemens reported these vulnerabilities to ICS-CERT. BACKGROUND Critical Infrastructure Sectors: Energy Countries/Areas Deployed: Worldwide Company Headquarters Location: Germany Contact Information For any questions related to this report, please contact ICS-CERT at: Email: ics-cert@hq.dhs.gov (link sends e-mail) Toll Free: 1-877-776-7585 International Callers: (208) 526-0900 For industrial control systems security information and incident reporting: http://ics-cert.us-cert.gov - --------------------------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. 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: 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: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBWiDgxIx+lLeg9Ub1AQjItA/8CSZIh00IOkPQ5iX4WZ+7n6oo+kcaprD9 segQmokh/YGKkJclQsYkOzZgSYlZgOIM73kpMMpVveUN/qtBkCPjH3zeyiy9kj7L Wk7HR8BWkx9tz/EnR+JYjHQchOe9OFEeOrrxJOShCDjsbtr6jmuzqtADbx2BCq+B qLWLhfjTT5QFfHyP/XhPmZsFg9Uov0C49RSOPAAASDtlMoTYBN2KknSN+9Mx3Yv5 pHffwjpaEdajWtthblewpzHIbR9LiHKlJqNzNrMVwuqwHL/7ITXDEBOsrDTES50h iJ4D9q4DmpVfykXXao7gmTwNUOW+KoOdeKurwiUiYv5Pk9u1tOuP1kJX4FxYtK2R egOx6O80NUE677k4itJxr1IOmbFQ075Y7U2DVzCY/NgJlvWmJzKvFPHojU2ZEZP4 q1k1Az959PNhBHcZHCZPquMR9EGUpvoag6uOvW/QIy3OXC7hKiUnlupvWEa13Aaj 7wfxhplg+AgV7/OtOZwAOqMCNF5u+r3NAIebyHkNeXmA5KQNiWuUZbQ6EJermTq8 16jpscKqCF0wgSQnlgCck0CtRlXJNWlMbQEgwruvhCfDokrJUyhl4sj9+teq8n8b o+yJSLiQjjfidYZ04ZRrFEleIuGZlIdnuPpaJFwTf1UtGbWmdCuBKHd2xvZ/dSeP hiYOX/D6Z5o= =w2It -----END PGP SIGNATURE-----