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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2017.2158 Multiple vulnerabilities have been identified in Advantech WebAccess 30 August 2017 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Advantech WebAccess Publisher: ICS-CERT Operating System: Windows Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated Administrator Compromise -- Existing Account Denial of Service -- Remote with User Interaction Access Confidential Data -- Remote/Unauthenticated Reduced Security -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2017-12717 CVE-2017-12713 CVE-2017-12711 CVE-2017-12710 CVE-2017-12708 CVE-2017-12706 CVE-2017-12704 CVE-2017-12702 CVE-2017-12698 Original Bulletin: https://ics-cert.us-cert.gov/advisories/ICSA-17-241-02 - --------------------------BEGIN INCLUDED TEXT-------------------- Advisory (ICSA-17-241-02) Advantech WebAccess Original release date: August 29, 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 7.8 ATTENTION: Remotely exploitable/low skill level to exploit. Vendor: Advantech Equipment: WebAccess Vulnerabilities: SQL Injection, Out-of-Bounds Access, Multiple Buffer Overflows, Externally Controlled Format String, Improper Authentication, Incorrect Permission Assignment for Critical Resource, Incorrect Privilege Assignment, Uncontrolled Search Path Element. AFFECTED PRODUCTS The following versions of WebAccess, an HMI platform, are affected: WebAccess versions prior to V8.2_20170817 IMPACT Successful exploitation of these vulnerabilities may allow remote code execution or unauthorized access and could cause the device that the attacker is accessing to crash. MITIGATION Advantech has released a new version of WebAccess to address the reported vulnerabilities. Users can download WebAccess Version V8.2_20170817 at the following location (registration required): http://www.advantech.com/industrial-automation/webaccess 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 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. 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 for more information on avoiding email scams. Refer to Avoiding Social Engineering and Phishing Attacks for more information on social engineering attacks. No known public exploits specifically target these vulnerabilities. VULNERABILITY OVERVIEW IMPROPER NEUTRALIZATION OF SPECIAL ELEMENTS USED IN AN SQL COMMAND 'SQL INJECTION' CWE-89 By submitting a specially crafted parameter, it is possible to inject arbitrary SQL statements that could allow an attacker to obtain sensitive information. CVE-2017-12710 has been assigned to this vulnerability. A CVSS v3 base score of 5.3 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N). IMPROPER RESTRICTION OF OPERATIONS WITHIN THE BOUNDS OF A MEMORY BUFFER CWE-119 Researchers have identified multiple vulnerabilities that allow invalid locations to be referenced for the memory buffer, which may allow an attacker to execute arbitrary code or cause the system to crash. CVE-2017-12708 has been assigned to this vulnerability. A CVSS v3 base score of 6.3 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L). STACK-BASED BUFFER OVERFLOW CWE-121 Researchers have identified multiple vulnerabilities where there is a lack of proper validation of the length of user-supplied data prior to copying it to a stack-based buffer, which could allow an attacker to execute arbitrary code under the context of the process. CVE-2017-12706 has been assigned to this vulnerability. A CVSS v3 base score of 6.3 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L). HEAP-BASED BUFFER OVERFLOW CWE-122 Researchers have identified multiple vulnerabilities where there is a lack of proper validation of the length of user-supplied data prior to copying it to the heap-based buffer, which could allow an attacker to execute arbitrary code under the context of the process. CVE-2017-12704 has been assigned to this vulnerability. A CVSS v3 base score of 6.3 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L). USE OF EXTERNALLY-CONTROLLED FORMAT STRING CWE-134 String format specifiers based on user provided input are not properly validated, which could allow an attacker to execute arbitrary code. CVE-2017-12702 has been assigned to this vulnerability. A CVSS v3 base score of 6.3 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L). IMPROPER AUTHENTICATION CWE-287 Specially crafted requests allow a possible authentication bypass that could allow remote code execution. CVE-2017-12698 has been assigned to this vulnerability. A CVSS v3 base score of 7.3 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L). INCORRECT PERMISSION ASSIGNMENT FOR CRITICAL RESOURCE CWE-732 Multiple files and folders with ACLs that affect other users are allowed to be modified by non-administrator accounts. CVE-2017-12713 has been assigned to this vulnerability. A CVSS v3 base score of 7.8 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H). INCORRECT PRIVILEGE ASSIGNMENT CWE-266 A built-in user account has been granted a sensitive privilege that may allow a user to elevate to administrative privileges. CVE-2017-12711 has been assigned to this vulnerability. A CVSS v3 base score of 7.8 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H). UNCONTROLLED SEARCH PATH ELEMENT CWE-427 A maliciously crafted dll file placed earlier in the search path may allow an attacker to execute code within the context of the application. CVE-2017-12717 has been assigned to this vulnerability. A CVSS v3 base score of 4.8 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L). RESEARCHERS Independent researcher Fritz Sands, independent researcher rgod, Tenable Network Security, and an anonymous researcher, all working with Trend Micros Zero Day Initiative, and Haojun Hou and DongWang from ADLab of Venustech identified these vulnerabilities. BACKGROUND Critical Infrastructure Sector: Critical Manufacturing, Energy, Water and Wastewater Countries/Areas Deployed: East Asia, United States, Europe Company Headquarters Location: Taiwan 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 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). 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