18 May 2016
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2016.1248 IRZ RUH2 3G Firmware Overwrite Vulnerability 18 May 2016 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: IRZ RUH2 3G Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Reduced Security -- Remote with User Interaction Resolution: Patch/Upgrade CVE Names: CVE-2016-2309 Original Bulletin: https://ics-cert.us-cert.gov/advisories/ICSA-16-138-01 - --------------------------BEGIN INCLUDED TEXT-------------------- Advisory (ICSA-16-138-01) IRZ RUH2 3G Firmware Overwrite Vulnerability Original release date: May 17, 2016 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 NCCIC/ICS-CERT has identified a firmware overwrite vulnerability in iRZ's RUH2 device. iRZ has discontinued this product and no longer offers support. This vulnerability could be exploited remotely. Exploits that target this vulnerability are known to be publicly available. AFFECTED PRODUCTS The following iRZ product is affected: RUH2 IMPACT An attacker could corrupt the firmware of the serial-to-Ethernet converters employed for substation communications and network routers. 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 iRZ is a Russian-based company that maintains offices in several countries around the world, including China, Iran, Ukraine, Kazakhstan, France, Belgium, Switzerland, Italy, and Spain. The affected product, RUH2, is a serial-to-network connector system. According to iRZ, RUH2s are deployed across several sectors including Commercial Facilities, Communications, Financial Services, Healthcare and Public Health, and others. iRZ estimates that this product is used primarily in Eastern Europe. VULNERABILITY CHARACTERIZATION VULNERABILITY OVERVIEW UNRESTRICTED UPLOAD OF FILE[a] Authorized users can remotely update the firmware with an unvalidated patch. CVE-2016-2309[b] has been assigned to this vulnerability. A CVSS v3 base score of 6.1 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:H/A:H).[c] VULNERABILITY DETAILS EXPLOITABILITY This vulnerability could be exploited remotely. EXISTENCE OF EXPLOIT Exploits that target this vulnerability are publicly available. DIFFICULTY An attacker with a low skill would be able to exploit this vulnerability. MITIGATION iRZ recommends users replace the RUH2 with either the RUH2b or RUH3. Additional information on this vulnerability is available at: http://www.irz.net/en/support. 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 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 (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. a. CWE-434: Unrestricted Upload of File with Dangerous Type, http://cwe.mitre.org/data/definitions/434.html, web site last accessed May 17, 2016. b. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-2309, 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, https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S..., web site last accessed May 17, 2016. 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 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 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 iQIVAwUBVzv6JH6ZAP0PgtI9AQKFkA/9G7A/vZYqcp9PGpaGmGv96+MVLGZOVyNx pAdI5S510F8+PBnZA1lqrx1DPkXzBq1eQilILAL4EzIQ2/K5sc3a0QqdLlVtayWG c1wSUrxhQQap70nMCgaNkSSl/tawKolKvkbGpoD0pxNocmCOTtsb5GLImqNeWBSW x5fMwsjSnwjde+ofuU9VMoW77TLcqjL299njzTHNK5pMlZ4IzrLubmdsqs/baUWF 6Vbu5rGj71zqK1DewKyRB2C4SnNczmK7mQVDc+Vow2390czBCx39lHn8RarDE7Rx JGUBbplMG8uSR66zmTsNfBxNW4GscS2N9ufnv1QS1jz48PXHm1fetOzJ2x8qxClu xiQU9oQ5jcOIP/kr8oLCCURk1IP9vt2sj1Y8ab/S3Hzj982uIT+UkPJR06fmmNpB 1J2FwsEcLopOJS4D2Ki8beFqZHpNtC2Nzj7UlmiaFVv0Dc9MxonMDmrMb/mGntya nBctGC3xVjUVYm9yZ2EobPVdAPOaaHs9i5zN5H/IZbL4u4ZzJOo9AZ/gRCZdnZDa NwhX+uqMqM4qU8uNBIjepGJfc7zsbuwbZ0jE0lzsuoSfF3DoIDeWHK0boISBGd3r jZzP/wNJzutfPiOwPX2/T0fJtaHMbewn9ylzymB8Sb8uRIgZ7vsMhCWJ7THYNGI3 3On1R0s8qt4= =W0sZ -----END PGP SIGNATURE-----