22 July 2015
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2015.1915 Siemens RuggedCom ROS and ROX-based Devices TLS POODLE Vulnerability 22 July 2015 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Siemens RuggedCom ROS and ROX devices Publisher: US-CERT Operating System: Network Appliance Impact/Access: Access Privileged Data -- Remote with User Interaction Unauthorised Access -- Remote with User Interaction Resolution: Patch/Upgrade CVE Names: CVE-2015-5537 Original Bulletin: https://ics-cert.us-cert.gov/advisories/ICSA-15-202-03 - --------------------------BEGIN INCLUDED TEXT-------------------- Advisory (ICSA-15-202-03) Siemens RuggedCom ROS and ROX-based Devices TLS POODLE Vulnerability Original release date: July 21, 2015 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 has reported to NCCIC/ICS-CERT that a Transport Layer Security (TLS) Padding Oracle On Downgraded Legacy Encryption (POODLE) vulnerability exists in the web interface of Siemens RuggedCom ROS and ROX-based devices. Siemens has produced a firmware update to mitigate this vulnerability. This vulnerability could be exploited remotely. AFFECTED PRODUCTS The following Siemens RuggedCom ROS versions are affected: RuggedCom devices with ROS: All firmware versions prior to v4.2.0 RuggedCom devices with ROX: All firmware versions prior to v2.6.3 IMPACT Successful exploitation of this vulnerability may allow attackers to hijack an active web session and access administrative functions on the devices without proper authorization or allow unprivileged users to perform privilege escalation. Impact to individual organizations depends on many factors that are unique to each organization. ICS-CERT recommends that organizations evaluate the impact of this vulnerability based on their operational environment, architecture, and product implementation. BACKGROUND Siemens is an international company headquartered in Munich, Germany. The affected products, Siemens RuggedCom ROS and ROX-based devices, are used to connect devices that operate in harsh environments such as electric utility substations and traffic control cabinets. According to Siemens, RuggedCom ROS and ROX-based devices are deployed across several sectors including Energy, Healthcare and Public Health, and Transportation Systems. Siemens estimates that these products are used worldwide. VULNERABILITY CHARACTERIZATION VULNERABILITY OVERVIEW CYRPTOGRAPHIC ISSUES [a] The web interface (Port 443/TCP) of the affected devices is vulnerable to a padding oracle attack (also known as TLS POODLE). A remote attacker in a privileged network position could possibly recover parts of the plain text if unsuspecting users are misled to click on a malicious link. CVE-2015-5537 [b] has been assigned to this vulnerability. A CVSS v2 base score of 4.3 has been assigned; the CVSS vector string is (AV:N/AC:M/Au:N/C:P/I:N/A:N). [c] VULNERABILITY DETAILS EXPLOITABILITY Exploitation of this vulnerability could allow remote attackers to recover parts of the plaintext of an encrypted connection under certain circumstances. This vulnerability can be staged remotely but cannot be exploited without user interaction. The exploit is only triggered when a local user voluntarily interacts with the attack mechanism. EXISTENCE OF EXPLOIT No known public exploits specifically target this vulnerability. DIFFICULTY Crafting a working exploit for this vulnerability would be difficult. Social engineering is required to convince the user to accept the malformed file. Additional user interaction is needed to load the malformed file. This decreases the likelihood of a successful exploit. MITIGATION Siemens has produced a firmware update v4.2.0 for ROS-based devices, which fixes the vulnerability. The firmware updates for the affected products can be obtained online at: http://www.siemens.com/automation/support-request Call a local hotline center: http://www.automation.siemens.com/ Asset owners and operators should contact Siemens customer support to acquire the update. For more information on this vulnerability and detailed instructions, please see Siemens Security Advisory SSA-396873 at the following location: http://www.siemens.com/innovation/pool/de/forschungsfelder/siemens_security_advisory_ssa-396873.pdf 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. In addition, ICS-CERT recommends that users take the following measures to protect themselves from social engineering attacks: Do not click web links or open unsolicited attachments in email messages. Refer to Recognizing and Avoiding Email Scams [d] for more information on avoiding email scams. Refer to Avoiding Social Engineering and Phishing Attacks [e] for more information on social engineering attacks. a. CWE-310: Cryptographic Issues, http://cwe.mitre.org/data/definitions/310.html, web site last accessed July 21, 2015. b. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-5537, 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, http://nvd.nist.gov/cvss.cfm?version=2&vector=AV:N/AC:M/Au:N/C:P/I:N/A:N, web site last accessed July 21, 2015. d. Recognizing and Avoiding Email Scams, http://www.us-cert.gov/reading_room/emailscams_0905.pdf, web site last accessed July 21, 2015. e. National Cyber Alert System Cyber Security Tip ST04-014, http://www.us-cert.gov/cas/tips/ST04-014.html, web site last accessed July 21, 2015. Contact Information For any questions related to this report, please contact ICS-CERT at: Email: firstname.lastname@example.org 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 - --------------------------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 email@example.com 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: firstname.lastname@example.org 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 iQIVAwUBVa8nEH6ZAP0PgtI9AQIb8Q//Zuu9bJ8boBEKNLmtZzgvhI/eh/wupBK1 /5uCnTr0c7m1o66e6EPQXIcrySgIg7l0uDrayWTHICSPSAM7a6k6M4BCE/67fuZz trpzbRqJBVsafSx2E4yRJJ39psAB9GcRt89gEE/5lIpqoOOO0MVPt16TH3LuTCHb +L+k6x/W0HXULYduqpkpqpIipTqoF6VXcdNwZmnn8SQlhAaaoNVINwsaVmQT2Vgj mVAoX8CUrZrFpE4T5yTElS+rwpsRJOAFPrlww5HlNqF1arcAfv91+b41DgQvGgiS tD++JO9s2H9/S5Df4Y1KT8oFA7tjAA8cxsN5ScRytCO5blKpWan4VJ1gEuMP2n0e gDxG028oHz5BHxMAe0lodRnVW94v10zqpoJh72Ms7zIU/F1yx+6xVWAZMm7/duxb ll/hIr3zV5BfKWxYmTNgPIF7CuuQCi35DIbwmo3qfj1fuh/mTPYfXDJQsXelBr+b GxLF3vgXItFb45gK1HY4WH/11e0JHcUjiz0oTBq2trkvw0IXv807fnKG6+eh26w9 XcA4bignhkvNyLxb7AroU+Ln8RVx5Tzg3zJrfHopqMsNellGMgQLTBW2sU5TrN2k zESYtl7JXZ5q7S0u1ge998Xtj4tg9BVGpXC6vz/SJ4igGY07+372Vb1jbPzdkida p0qwC9Garlc= =upkx -----END PGP SIGNATURE-----