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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2016.2101 Siemens SIPROTEC 4 and SIPROTEC Compact Vulnerabilities 8 September 2016 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Siemens SIPROTEC 4 and SIPROTEC Compact devices Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Administrator Compromise -- Remote/Unauthenticated Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2016-7114 CVE-2016-7113 CVE-2016-7112 Original Bulletin: https://ics-cert.us-cert.gov/advisories/ICSA-16-250-01 - --------------------------BEGIN INCLUDED TEXT-------------------- Advisory (ICSA-16-250-01) Siemens SIPROTEC 4 and SIPROTEC Compact Vulnerabilities Original release date: September 06, 2016 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/. OVERVIEW Siemens reports that they have released a firmware update for SIPROTEC 4 and SIPROTEC Compact devices to mitigate authentication bypass and resource exhaustion vulnerabilities. Kirill Nesterov and Anatoly Katushin from Kaspersky Lab reported some of these vulnerabilities directly to Siemens. These vulnerabilities could be exploited remotely. AFFECTED PRODUCTS Siemens reports that these vulnerabilities affect the following products: EN100 Ethernet module (as optional for SIPROTEC 4 and SIPROTEC Compact): All versions prior to V4.29 IMPACT An attacker may be able to access the administrative web application by exploiting these vulnerabilities. Impact to individual organizations depends on many factors that are unique to each organization. NCCIC/ICS-CERT recommends that organizations evaluate the impact of these vulnerabilities based on their operational environment, architecture, and product implementation. BACKGROUND Siemens is a multinational company headquartered in Munich, Germany. The affected products, SIPROTEC 4 and SIPROTEC Compact devices, provide a wide range of integrated protection, control, measurement, and automation functions for electrical substations and other fields of application. The EN100 module is used for enabling IEC 61850 communications with electrical/optical 100 Mbit interface for SIPROTEC 4 and SIPROTEC Compact devices. According to Siemens, SIPROTEC devices are deployed across several sectors including Energy. Siemens estimates that these products are used worldwide. VULNERABILITY CHARACTERIZATION VULNERABILITY OVERVIEW AUTHENTICATION BYPASS ISSUES [a] Attackers with network access to the devices web interface (Port 80/TCP) could possibly circumvent authentication and perform administrative operations. CVE-2016-7112 [b] 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). [c] RESOURCE EXHAUSTION [d] Specially crafted packets sent to Port 80/TCP could cause the affected device to go into defect mode. CVE-2016-7113 [e] 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). [f] AUTHENTICATION BYPASS ISSUES [g] Attackers with network access to the devices web interface (Port 80/TCP) could possibly circumvent authentication and perform administrative operations. A legitimate user must be logged into the web interface for the attack to be successful. CVE-2016-7114 [h] 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). [i] VULNERABILITY DETAILS EXPLOITABILITY These vulnerabilities could be exploited remotely. EXISTENCE OF EXPLOIT No known public exploits specifically target these vulnerabilities. DIFFICULTY An attacker with a low skill would be able to exploit these vulnerabilities. MITIGATION Siemens provides firmware update V4.29 for EN100 modules included in SIPROTEC 4 and SIPROTEC Compact devices to fix the vulnerabilities. Siemens recommends users update to the latest firmware version. The firmware update for SIPROTEC 4 can be obtained from the SIPROTEC 4 downloads area: http://www.siemens.com/downloads/siprotec-4 (link is external) (further navigation required to select correct update) The firmware update for SIPROTEC Compact with EN100 module can be obtained here: http://www.siemens.com/downloads/siprotec-compact (link is external) (further navigation required to select correct update) For more information on these vulnerabilities and more detailed mitigation instructions, please see Siemens Security Advisory SSA-630413 at the following location: http://www.siemens.com/cert/advisories (link is external) 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 at: http://ics-cert.us-cert.gov/content/recommended-practices. 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 (http://ics-cert.us-cert.gov/). 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. a. CWE-592: Authentication Bypass Issues, http://cwe.mitre.org/data/definitions/592.html, web site last accessed September 6, 2016. b. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-7112, NIST uses this advisory to create the CVE web site report. This web site will be active sometime after publication of this advisory. c. CVSS Calculator, https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S..., web site last accessed September 6, 2016. d. CWE-400: Uncontrolled Resource Consumption ('Resource Exhaustion'), http://cwe.mitre.org/data/definitions/400.html, web site last accessed September 6, 2016. e. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-7113, NIST uses this advisory to create the CVE web site report. This web site will be active sometime after publication of this advisory. f. CVSS Calculator, https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S..., web site last accessed September 6, 2016. g. CWE-592: Authentication Bypass Issues, http://cwe.mitre.org/data/definitions/592.html, web site last accessed September 6, 2016. h. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-7114, NIST uses this advisory to create the CVE web site report. This web site will be active sometime after publication of this advisory. i. CVSS Calculator, https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S..., web site last accessed September 6, 2016. 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 ICS-CERT 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. 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If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/render.html?cid=1980 =========================================================================== 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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