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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2017.2954 Multiple vulnerabilities have been identified in Siemens SICAM RTUs Siemens SICAM 17 November 2017 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Siemens SICAM RTU Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated Cross-site Scripting -- Remote with User Interaction Access Confidential Data -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2017-12739 CVE-2017-12738 CVE-2017-12737 Original Bulletin: https://ics-cert.us-cert.gov/advisories/ICSA-17-320-02 - --------------------------BEGIN INCLUDED TEXT-------------------- Advisory (ICSA-17-320-02) Siemens SICAM Original release date: November 16, 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 9.8 ATTENTION: Remotely exploitable/low skill level to exploit. Public exploits are available. Vendor: Siemens Equipment: SICAM Vulnerabilities: Missing Authentication for Critical Function, Cross-site Scripting, Code Injection AFFECTED PRODUCTS Siemens reports that the vulnerabilities affect the following SICAM products: SICAM RTUs SM-2556 COM Modules with the firmware variants ENOS00, ERAC00, ETA2, ETLS00, MODi00, DNPi00: All versions. IMPACT Successful exploitation of these vulnerabilities could allow an unauthenticated remote attacker to execute arbitrary code. MITIGATION As the web server is for diagnostics only and not required for normal operation, Siemens recommends disabling the web server after commissioning. For users who are currently using the discontinued ETA2 (IEC 60870-5-104), MODi00 (Modbus/TCP slave) or DNPi00 (DNP3/TCP slave) firmware, Siemens recommends users upgrade to ETA4 (IEC 60870-5-104), MBSiA0 (Modbus/TCP slave) or DNPiA1 (DNP3/ TCP slave) firmware, respectively, on the SM-2558 COM Module, which is the successor to the SM-2556 Module. The upgrades are available at: http://w3.siemens.com/smartgrid/global/en/products-systems-solutions/substation-automation/substation-automation/Pages/sicam-ak-3.aspx (link is external) 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) For more information on these vulnerabilities and more detailed mitigation instructions, please see Siemens Security Advisory SSA-164516 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 ICS-CERT 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. VULNERABILITY OVERVIEW MISSING AUTHENTICATION FOR CRITICAL FUNCTION CWE-306 The integrated web server (Port 80/TCP) of the affected devices could allow unauthenticated remote attackers to obtain sensitive device information over the network. CVE-2017-12737 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 NEUTRALIZATION OF INPUT DURING WEB PAGE GENERATION ('CROSS-SITE SCRIPTING') CWE-79 The integrated web server (Port 80/TCP) of the affected devices could allow cross-site scripting (XSS) attacks if unsuspecting users are tricked into clicking on a malicious link. CVE-2017-12738 has been assigned to this vulnerability. A CVSS v3 base score of 6.1 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N). IMPROPER CONTROL OF GENERATION OF CODE ('CODE INJECTION') CWE-94 The integrated web server (Port 80/TCP) of the affected devices could allow unauthenticated remote attackers to execute arbitrary code on the affected device. CVE-2017-12739 has been assigned to this vulnerability. A CVSS v3 base score of 9.8 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H). RESEARCHER SEC Consult Vulnerability Lab reported these vulnerabilities directly to Siemens. 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 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. 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 iQIVAwUBWg5vUox+lLeg9Ub1AQjgeA//dc5bv3fVwopKgYrGVKq303D1w8s/z/Rh Besetd8snzQN7H7Jf4A7xBzATIPVCQeRIpD9jkaO+nc3Zl4a/UhZYg4W/5tXDjA6 6fGIVD6l5CIulXrJEvyqciBfkHDqANv1xDbQ2dzK9qPvr32gqlBYzQmW9H6Z6TGm j4gGfYFTCsjdYao/IGwk7sV2zJ0JGpq7aZ9vPFubAsp7VL9/awJyPdYZ7cjbf1u3 vdy9erFlk8jqvnssSXERGpdh4DVXBtXPmga/3c5dx/gXDxSGWd67rojm0iY+iLem mLezPGpFy9tHdpm53adh0Ct4RdsHFIHYB7icUDegvYlHdM0kk9q4GI8QuRFafYvY micKlJM7wx86DgDCINcBennou2B+SQcR2ZEvsiPo+3YKLgA5YOkCBGzVWxEMc8yo m4dN+DHWSOKy+yBXCDtmJg9SMb+KrHXp6pX9g4VhIdRVchj/yRYcRcnoOvAorIEs 2lOqgudxhcwRL2yNWA+m8GWeJY50eFv9nw7V8UmKEh0HIKe99E4KsnKINV6D8G5Q oJg1AyyrvLVobG8gNPkYYXNW9nKTzJlSKi5TtxjCOxGFEAjs2yZeF3pXs1gGw4AR Vm/yNSKPQDhWAscLAQosb2wyIG3ufn9obmW03jxuepC4sc1J/kFg5lwo5mmjiAjM vp3oWgUMPWs= =KC9g -----END PGP SIGNATURE-----