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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2019.0442 Advisory (ICSA-19-043-06) Siemens CP1604 and CP1616 13 February 2019 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Siemens CP1604 and CP1616 Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Denial of Service -- Remote/Unauthenticated Cross-site Request Forgery -- Remote with User Interaction Cross-site Scripting -- Remote with User Interaction Access Confidential Data -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2018-13810 CVE-2018-13809 CVE-2018-13808 Original Bulletin: https://ics-cert.us-cert.gov/advisories/ICSA-19-043-06 - --------------------------BEGIN INCLUDED TEXT-------------------- Advisory (ICSA-19-043-06) Siemens CP1604 and CP1616 Original release date: February 12, 2019 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/ . 1. EXECUTIVE SUMMARY o CVSS v3 9.1 o ATTENTION : Exploitable remotely/low skill level to exploit o Vendor : Siemens o Equipment : CP1604 and CP1616 o Vulnerabilities : Cleartext Transmission of Sensitive Information, Cross-site Scripting, Cross-site Request Forgery 2. RISK EVALUATION Successful exploitation of these vulnerabilities could result in a denial-of-service condition and information exposure. An attacker could inject arbitrary JavaScript in a specially crafted URL request to execute on unsuspecting user's systems, allowing an attacker to trigger actions via the web interface that a legitimate user is allowed to perform. 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS Siemens reports the following CP products are affected: o CP 1604 and 1616: All versions prior to v2.8 3.2 VULNERABILITY OVERVIEW 3.2.1 CLEARTEXT TRANSMISSION OF SENSITIVE INFORMATION CWE-319 An attacker with network access to Port 23/TCP could extract internal communication data or cause a denial-of-service condition. CVE-2018-13808 has been assigned to this vulnerability. A CVSS v3 base score of 9.1 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/ C:H/I:N/A:H ). 3.2.2 IMPROPER NEUTRALIZATION OF INPUT DURING WEB PAGE GENERATION ('CROSS-SITE SCRIPTING') CWE-79 The integrated web server of the affected CP devices could allow cross-site scripting (XSS) attacks if unsuspecting users are tricked into following a malicious link. CVE-2018-13809 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 ). 3.2.3 CROSS-SITE REQUEST FORGERY CWE-352 The integrated configuration web server of the affected CP devices could allow a cross-site request forgery (CSRF) attack if an unsuspecting user is tricked into accessing a malicious link. CVE-2018-13810 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:N/I:L/A:N ) 3.3 BACKGROUND o CRITICAL INFRASTRUCTURE SECTORS : Chemical, Critical Manufacturing, Energy, Food and Agriculture, Water and Wastewater Systems o COUNTRIES/AREAS DEPLOYED : Worldwide o COMPANY HEADQUARTERS LOCATION : Germany 3.4 RESEARCHER Siemens reported these vulnerabilities to NCCIC. 4. MITIGATIONS Siemens recommends users update to version 2.8, which can be located here: https://support.industry.siemens.com/cs/ww/en/view/109762689 Siemens has identified the following specific workarounds and mitigations users can apply to reduce the risk: o Disable the integrated web server. The web server is disabled in the default settings and its use is optional. Use in a productive environment is discouraged. o Restrict access to the device to the internal or VPN network. Further restrict access to the web interface (80/TCP) and to the telnet port (23/ TCP) to trusted IP addresses if possible. o Do not click on links from unknown sources. As a general security measure, Siemens strongly recommends protecting network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends configuring the environment according to Siemens' operational guidelines for industrial security ( https:// www.siemens.com/cert/operational-guidelines-industrial-security ), and following the recommendations in the product manuals. Additional information on industrial security by Siemens can be found at: https://www.siemens.com/industrialsecurity For more information on these vulnerabilities and associated software updates, please see Siemens security advisory SSA-559174 on their website: https://www.siemens.com/cert/advisories NCCIC recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should: o Minimize network exposure for all control system devices and/or systems, and ensure that they are not accessible from the Internet . o Locate control system networks and remote devices behind firewalls, and isolate them from the business network. o 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 on the ICS-CERT website 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 NCCIC for tracking and correlation against other incidents. No known public exploits specifically target these vulnerabilities. - --------------------------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. 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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: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBXGOQS2aOgq3Tt24GAQhihBAAjDlvBELDH4jbKL8peB6y1X2yhG3tdw1v NqpjzAkwXI2Bb338gzBIAxitTDbNfS5Oq1UE/NtMQPdj121p5p6soCVz72rKlOMJ MxJL6ivjxGHn9vLMBrSfJDAu0L6AFKpVjC81QGK5xMmJC4IvAMoMm2w8gmN/yLGy lLrBWqPtAs7UDJzhAvCsgOEZOXTJ/PWoVmP60e41RrP84bmEt4OUHGnBeHAFZJ+f ghGdsALY98XwIYs6ToNmXZGgsPlrDan0cLEmw3gG3X5jexlufV3eYNz7INEVDa9M UzJ1xuFl6mT03MkbbMZOzIXATZG5u/RLBskt1MELa7ofIqROGn52tQS7zmMS1KRQ m/uNBOASuo321IZnKyA5xPRe7SQiWGQflpQCNH6VbBJhHcUmrStb7D5nV50dEC1/ aoax7IZN/s7xWZX6JcyS/rsBZfTLSg1ijDd0yfsUvBU3LEB/XO9MuydsXRpfzJ0N 8XWD43Ck2+sT+p2/0Iamn1fOEcFO2+EyS2X43eeRNMr4/ZMxjWYxdJonkFZzN4Jc gWZPWMkfG7vjnJx+fFsGWDAcMe07GIa+sXKXBnNWUUw5CtDoTRqmPV2IwO0m365P dtOdFlCU9t+TL3yYbm9bTQv0NznBSEoBBzSYGtMPflKhvWXW2U309Y0+smwa+/d5 IlTaF0zbbvg= =ze/l -----END PGP SIGNATURE-----