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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2013.1537 WellinTech KingView ActiveX Vulnerabilities 28 October 2013 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: WellinTech KingView Publisher: ICS-CERT Operating System: Windows Impact/Access: Overwrite Arbitrary Files -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2013-6128 CVE-2013-6127 Original Bulletin: http://ics-cert.us-cert.gov/advisories/ICSA-13-295-01 - --------------------------BEGIN INCLUDED TEXT-------------------- Advisory (ICSA-13-295-01) WellinTech KingView ActiveX Vulnerabilities Original release date: October 22, 2013 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 This advisory is a follow-up to the alert titled ICS-ALERT-13-256-01 WellinTech KingView ActiveX Vulnerabilities[a] that was published September 13, 2013, on the NCCIC/ICS-CERT Web site. Independent researcher "Blake" identified ActiveX vulnerabilities and released proof-of-concept (exploit) code for WellinTech KingView application without coordination with NCCIC/ICS-CERT, the vendor, or any other coordinating entity known to NCCIC/ICS-CERT. WellinTech has produced a new version that mitigates these vulnerabilities. These vulnerabilities could be exploited remotely. Exploits that target these vulnerabilities are known to be publicly available. AFFECTED PRODUCTS The following KingView versions are affected: KingView versions older than Version 6.53. IMPACT Successful exploitation of these vulnerabilities may allow an attacker to overwrite files and copy them from one location to another on the target machine. 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 WellinTech is a software development company specializing in automation and control. WellinTech is based in Beijing, China, with branches in the United States, Japan, Singapore, Europe, and Taiwan. According to the WellinTech Web site, the KingView product is a Windows-based control, monitoring, and data collection application deployed across several industries including power, water, building automation, mining, and others. VULNERABILITY CHARACTERIZATION VULNERABILITY OVERVIEW INSECURE ACTIVEX CONTROL[b] WellinTech KingView contains a flaw in the SuperGrid.ocx ActiveX control that allows an attacker to traverse outside a restricted path. The issue is due to the program not properly sanitizing user input, specifically directory traversal style attacks. This proof of concept will copy any arbitrary file from one location to a second location. It can also be used to overwrite existing files. This vulnerability may be used to inject files which, in turn, may allow arbitrary code execution. CVE-2013-6127[c] has been assigned to this vulnerability. A CVSS v2 base score of 5.8 has been assigned; the CVSS vector string is (AV:N/AC:M/Au:N/C:N/I:P/A:P).[d] ACTIVEX REMOTE FILE CREATION/OVERWRITE[e] WellinTech KingView contains a flaw in the KChartXY.ocx ActiveX control that allows an attacker to traverse outside a restricted path. The issue is due to the program not properly sanitizing user input. Proof of concept overwrites the win.ini file. CVE-2013-6128[f] has been assigned to this vulnerability. A CVSS v2 base score of 5.8 has been assigned; the CVSS vector string is (AV:N/AC:M/Au:N/C:N/I:P/A:P).[g] VULNERABILITY DETAILS EXPLOITABILITY These vulnerabilities could be exploited remotely. EXISTENCE OF EXPLOIT Exploits that target these vulnerabilities are publicly available. DIFFICULTY An attacker with a medium skill would be able to exploit these vulnerabilities. MITIGATION WellinTech has provided the following links to download new versions of the affected files: SuperGrid.ocx Version number:65.30.30000.10002 http://www.kingview.com/en/downloads/Downloads/SuperGrid.rar KChartXY.ocx Version number:65.30.30000.10002 http://www.kingview.com/en/downloads/Downloads/KChartXY.rar It is also possible to correct the flaw by implementing the following workarounds: Set the kill-bit on the KChartXY ActiveX Control (CLSID A9A2011A-1E02-4242-AAE0-B239A6F88BAC). Set the kill-bit on the SuperGrid ActiveX Control (CLSID F494550F-A028-4817-A7B5-E5F2DCB4A47E). For specific information on mitigating ActiveX vulnerabilities, see Microsoft KB article 240797.[h] NCCIC/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. Critical devices should not directly face 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 VPN is only as secure as the connected devices. NCCIC/ICS-CERT also provides a section for control systems security recommended practices on the NCCIC/ICS-CERT Web page. Several recommended practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.[i] NCCIC/ICS-CERT reminds organizations to perform proper impact analysis and risk assessment prior to taking defensive measures. Additional mitigation guidance and recommended practices are publicly available in the NCCIC/ICS-CERT Technical Information Paper, ICS-TIP-12-146-01B-Targeted Cyber Intrusion Mitigation Strategies,[j] that is available for download from the NCCIC/ICS-CERT Web page (http://ics-cert.us-cert.gov/). Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to NCCIC/ICS-CERT for tracking and correlation against other incidents. a. ICS-ALERT-13-256-01 WellinTech KingView ActiveX Vulnerabilities, http://ics-cert.us-cert.gov/alerts/ICS-ALERT-13-256-01, Web site last accessed October 22, 2013. b. CWE-40: Path Traversal: '\\UNC\share\name\' (Windows UNC Share), http://cwe.mitre.org/data/definitions/40.html, Web site last accessed October 22, 2013. c. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2013-6127, NIST uses this advisory to create the CVE Web site report. This Web site will be active sometime after publication of this advisory. d. CVSS Calculator, http://nvd.nist.gov/cvss.cfm?version=2&vector=AV:N/AC:M/Au:N/C:N/I:P/A:P, Web site last visited October 22, 2013. e. CWE-28: Path Traversal: '..\filedir', http://cwe.mitre.org/data/definitions/28.html, Web site last accessed October 22, 2013. f. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2013-6128, NIST uses this advisory to create the CVE Web site report. This Web site will be active sometime after publication of this advisory. g. CVSS Calculator, http://nvd.nist.gov/cvss.cfm?version=2&vector=AV:N/AC:M/Au:N/C:N/I:P/A:P, Web site last visited October 22, 2013. h. Microsoft Support article: How to stop an ActiveX control from running in Internet Explorer, http://support.microsoft.com/kb/240797, Web site last accessed October 22, 2013. i. CSSP Recommended Practices, http://ics-cert.us-cert.gov/content/recommended-practices, Web site last accessed October 22, 2013. j. Targeted Cyber Intrusion Detection and Mitigation Strategies, http://ics-cert.us-cert.gov/tips/ICS-TIP-12-146-01B, Web site last accessed October 22, 2013. Contact Information For any questions related to this report, please contact ICS-CERT at: Email: ics-cert@hq.dhs.gov 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 answering a short series of questions about this product at the following URL: https://forms.us-cert.gov/ncsd-feedback/. - --------------------------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. 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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: 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). 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