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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2017.2186 Advisory (ICSA-17-243-02) Siemens LOGO! 1 September 2017 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Siemens LOGO! Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Access Privileged Data -- Remote with User Interaction Provide Misleading Information -- Remote with User Interaction Resolution: Patch/Upgrade CVE Names: CVE-2017-12735 CVE-2017-12734 Original Bulletin: https://ics-cert.us-cert.gov/advisories/ICSA-17-243-02 - --------------------------BEGIN INCLUDED TEXT-------------------- Advisory (ICSA-17-243-02) Siemens LOGO! Original release date: August 31, 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 7.5 ATTENTION: Remotely exploitable/low skill level to exploit. Vendor: Siemens Equipment: LOGO! Vulnerabilities: Insufficiently Protected Credentials, Man-in-the-Middle AFFECTED PRODUCTS Siemens reports that the vulnerabilities affect the following LOGO! devices: LOGO!8 BM: All versions. IMPACT Successful exploitation of these vulnerabilities could allow an attacker to hijack existing web sessions. MITIGATION Siemens provides LOGO!8 BM FS-05 with firmware Version V1.81.2, which fixes the first vulnerability. Siemens recommends applying the following mitigations for users with existing installations, and for mitigation of the second vulnerability: Configure the environment according to the recommendations in the user manual: https://support.industry.siemens.com/cs/us/en/view/109741041 (link is external) Apply cell protection concept Use VPN for protecting network communication between cells Apply Defense-in-Depth: https://www.industry.siemens.com/topics/global/en/industrial-security/Pages/default.aspx (link is external) As a general security measure, Siemens strongly recommends protecting network access to the devices with appropriate mechanisms. Siemens advises configuring the environment according to Siemens operational guidelines in order to run the devices in a protected IT environment. 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-087240 at the following location: http://www.siemens.com/cert/en/cert-security-advisories.htm (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. No known public exploits specifically target these vulnerabilities. VULNERABILITY OVERVIEW INSUFFICIENTLY PROTECTED CREDENTIALS CWE-522 An attacker with network access to the integrated web server on Port 80/TCP could obtain the session ID of an active user session. A user must be logged in to the web interface. Siemens recommends that users use the integrated webserver on Port 80/TCP only in trusted networks. CVE-2017-12734 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N). CHANNEL ACCESSIBLE BY NON-ENDPOINT ('MAN-IN-THE-MIDDLE') CWE-300 An attacker who performs a Man-in-the-Middle attack between the LOGO! and other devices could potentially decrypt and modify network traffic. CVE-2017-12735 has been assigned to this vulnerability. A CVSS v3 base score of 7.4 has been calculated; the CVSS vector string is (AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N). RESEARCHER Maxim Rupp discovered one of these two vulnerabilities. BACKGROUND Critical Infrastructure Sectors: Commercial Facilities, Transportation Systems 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: 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). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBWai+MIx+lLeg9Ub1AQjhxg/+PUzACSKUMdNPkueIPheawuMuknKN6irB HV/4Zp+AzLrhGNrciugzEqTCtAhCIBexnqp2hqzLMJfLBA5lBknKbKQS2SkLkNTK Ue6Y1/GYf86uwn/lVHFGClHc2OdEYC+sk4vsWTf53qaRqM+MiIKpcPBbUwiQE2UN kv3AvwBnzVfQwoTEWwYEdMYEXufPPW2N4IIoaJmbkvSWKpXb7Bb9AOAv7RB81c2j Ky4zXos/n6qH+LhJ//EgOjJOemMro1kPg/wO3L8wTq8lVUc6mWJzVYtWp38JLk2D xXW23fl9zhwET6eP23TagugLlfk+OuygpepywiUiuYHUpbhl790/ekrQFEHG/Azd ms/dI85/pmNG2pGzrWZjYqTbu7UCPH/33+aJnlc0Ms1Pm67crq1q2arR0yn1KI2L vxKnsn5yGcs8Wh794c0y9HOuOfJyR7LidsQTQlS7fKIh+vtvSjfiJKMFDLCvCEz1 DkNmU72Kv3pjwg2DQdE6S7JYHjmoiTWkkeoKSP5AmnyCV8gxiNphJ0nX4TcLAuld TMtN/cQRbkkRSfmDhOaKJlHuEMHjznzJJIXPBYLx0AC4LPNNFgsrFZhejSyeH5We +fEFWMLnX6eDfd44xBpReARQO3zQhbO4C0nchRxUbqA6SUg0BHXlQNhJONbBbKil dkjY92YufiU= =EpWN -----END PGP SIGNATURE-----