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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2018.2704 Advisory (ICSA-18-254-03) 12 September 2018 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Siemens TD Keypad Designer Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Execute Arbitrary Code/Commands -- Existing Account Increased Privileges -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2018-13806 Original Bulletin: https://ics-cert.us-cert.gov/advisories/ICSA-18-254-03 - --------------------------BEGIN INCLUDED TEXT-------------------- Advisory (ICSA-18-254-03) Siemens TD Keypad Designer Original release date: September 11, 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/. 1. EXECUTIVE SUMMARY o CVSS v3 7.3 o ATTENTION: Low skill level to exploit o Vendor: Siemens o Equipment: TD Keypad Designer o Vulnerability: Uncontrolled Search Path Element 2. RISK EVALUATION Successful exploitation of this vulnerability could allow a local low-privileged attacker to escalate their privileges. 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS According to Siemens the following products are affected: o TD Keypad Designer: All versions 3.2 VULNERABILITY OVERVIEW 3.2.1 UNCONTROLLED SEARCH PATH ELEMENT CWE-427 A DLL hijacking vulnerability exists in all versions of SIEMENS TD Keypad Designer which could allow an attacker to execute code with the permission of the user running TD Designer. The attacker must have write access to the directory containing the TD project file in order to exploit the vulnerability. A legitimate user with higher privileges than the attacker must open the TD project in order for this vulnerability to be exploited. CVE-2018-13806 has been assigned to this vulnerability. A CVSS v3 base score of 7.3 has been assigned; the CVSS vector string is (AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H). 3.3 BACKGROUND o CRITICAL INFRASTRUCTURE SECTORS: Chemical, Energy, Food and Agriculture, and Water and Wastewater Systems o COUNTRIES/AREAS DEPLOYED: Worldwide o COMPANY HEADQUARTERS LOCATION: Germany 3.4 RESEARCHER Siemens ProductCERT reported this vulnerability to NCCIC. 4. MITIGATIONS Siemens has identified the following specific workarounds and mitigations that users can apply to reduce the risk: o Restrict write permissions to directories with TD project files to authorized users. o Only open TD projects from trusted 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 (Download: 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 this vulnerability and associated software updates, please see Siemens security advisory SSA-198330 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 this vulnerability. This vulnerability is not remotely exploitable. 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 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 iQIVAwUBW5hcu2aOgq3Tt24GAQimUhAAiBv49tNpGAqENNXWiv0+VmegcIQxkV9M we4oyGuvJ0vgjIjxfUhMy+XAsfIomyQocldDU2xIhledR+PpVj5Z7GZ9OdI7YrqJ w2FzTVGAHIj9N2mrK4bbNU0HpROtjgT6QlHUHAiMmUTcAbNKLCZZydV1hqFAwQsv iiKGRSkzOLC8Z95dwuGr6mF9uuQubQ8ZmvvmYut9RoqmB1NGVCcZohWzFQlPJgZu M5NvzxZ1TSFtL8erjYFcl1/pZolI2sR8Ng/Ef3PG8UpOcByYNNeyO9LLVXfmoHgS j5zn0xdSPPkPLO9vv0NBu7kn0VWQWp8P9pkg2Higj7ThkwPkchUy5EINS96f9bah IiVGhPLi6GOopd1tD4KMeyfS8sAD8mnYgH00qkRJjhmwKCjTf77kSLNek9l9MlY7 xZbZjxXktdqcOwqQw2CD20FryvKh7a56jaAa1OqU6Dt1saaLUGzIcRUGWyVGodMo h2chTuPCfQ6Ttmx+kt0imyecAcD32ty2WXuFtg9rJgXmqdRqwavqPfXtijesDvzd +siyuxuwwcMOEdKzKhDI2Ry75oKyfj2NAuTcLeKH3QA9vsxqvZiH6HO35S6k5pLz yGB09fZvyJ8VN/8tuvcwVr0EFH13H+QCN/BzemZPacP/tcNtSVclhFlZadwafLtV 55m6vfkx+0U= =Uzre -----END PGP SIGNATURE-----