12 March 2015
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2015.0593 SCADA Engine BACnet OPC Server Vulnerabilities 12 March 2015 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: SCADA Engine BACnet OPS Server Publisher: US-CERT Operating System: Windows Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated Modify Arbitrary Files -- Remote/Unauthenticated Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2015-0981 CVE-2015-0980 CVE-2015-0979 Original Bulletin: https://ics-cert.us-cert.gov/advisories/ICSA-15-069-03 - --------------------------BEGIN INCLUDED TEXT-------------------- Advisory (ICSA-15-069-03) SCADA Engine BACnet OPC Server Vulnerabilities Original release date: March 10, 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 Independent researcher Josep Pi Rodriguez has identified three vulnerabilities in the SCADA Engine BACnet OPC Server application. SCADA Engine has produced a new software version that mitigates these vulnerabilities. Josep Pi Rodriguez has tested the new software version to validate that it resolves all three vulnerabilities. These vulnerabilities could be exploited remotely. AFFECTED PRODUCTS The following BACnet OPC Server versions are affected: OPC Server prior to and including Version 2.1.359.22 IMPACT The simple object access protocol (SOAP) web interface in the Windows Service used in this product has directly contributed to all three vulnerabilities. Arbitrary code execution is possible. Impact to individual organizations depends on many factors that are unique to each organization. NCCIC/ICS-CERT recommends that organizations evaluate the impact of these vulnerabilities based on their operational environment, architecture, and product implementation. BACKGROUND SCADA Engine is a Thailand-based company that maintains offices in Thailand. The affected product, BACnet OPC Server, provides data access, alarms and events, and historical data access between OPC clients and BACnet-compliant devices. The BACnet protocol was developed by the American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE). According to SCADA Engine, BACnet OPC Server is generally used for building automation and control systems. SCADA Engine estimates that these products are used globally. VULNERABILITY CHARACTERIZATION VULNERABILITY OVERVIEW HEAP-BASED BUFFER OVERFLOW[a] By sending a special packet to the BACnet OPS Server, it is possible to trigger a heap corruption. This could allow the attacker to cause a crash or to execute arbitrary code. CVE-2015-0979[b] has been assigned to this vulnerability. A CVSS v2 base score of 8.3 has been assigned; the CVSS vector string is (AV:N/AC:M/Au:N/C:P/I:P/A:C).[c] INPUT VALIDATION[d] The BACnet OPC Server contains a format string vulnerability. Sending a specially crafted request to BACnOPCSever.exe could possibly crash the service. This could allow the attacker to execute arbitrary code. CVE-2015-0980[e] has been assigned to this vulnerability. A CVSS v2 base score of 7.8 has been assigned; the CVSS vector string is (AV:N/AC:M/Au:N/C:P/I:N/A:C).[f] AUTHENTICATION[g] SCADA Engine Bacnet OPC Server has a vulnerability that allows an attacker to insert, read, or delete any items in the database. CVE-2015-0981[h] has been assigned to this vulnerability. A CVSS v2 base score of 10 has been assigned; the CVSS vector string is (AV:N/AC:L/Au:N/C:C/I:C/A:C).[i] VULNERABILITY DETAILS EXPLOITABILITY These vulnerabilities could be exploited remotely. EXISTENCE OF EXPLOIT No known public exploits specifically target these vulnerabilities. DIFFICULTY An attacker with a low skill would be able to exploit these vulnerabilities. MITIGATION SCADA Engine has developed and deployed a new software version, that can be downloaded at this URL: http:www.scadaengine.com/downloads/BACnetOPCServer_2.1.371.24.exe This new version of software has removed the SOAP web interface in the Window Service and replaced that with a proprietary communications protocol. In addition, requests from other personal computers are blocked to prevent attacks from another personal computer. All installation and technical information requests should be sent to: email@example.com ICS-CERT encourages asset owners to take additional defensive measures to protect against this and other cybersecurity risks. 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 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. ICS-CERT reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures. 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-122: Heap-based Buffer Overflow, http://cwe.mitre.org/data/definitions/122.html, web site last accessed March 10, 2015. b. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-0979, 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:P/A:C, web site last accessed March 10, 2015. d. CWE-20: Improper Input Validation, http://cwe.mitre.org/data/definitions/20.html, web site last accessed March 10, 2015. e. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-0980, NIST uses this advisory to create the CVE web site report. This web site will be active sometime after publication of this advisory. f. CVSS Calculator, http://nvd.nist.gov/cvss.cfm?version=2&vector=AV:N/AC:M/Au:N/C:P/I:N/A:C, web site last accessed March 10, 2015. g. CWE-287: Improper Authentication, http://cwe.mitre.org/data/definitions/287.html, web site last accessed March 10, 2015. h. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-0981, NIST uses this advisory to create the CVE web site report. This web site will be active sometime after publication of this advisory. i. CVSS Calculator, http://nvd.nist.gov/cvss.cfm?version=2&vector=AV:N/AC:L/Au:N/C:C/I:C/A:C, web site last accessed March 10, 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 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. 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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). 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