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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2017.2189.2 Advisory (ICSA-17-150-01) Automated Logic Corporation ALC WebCTRL, Liebert SiteScan, Carrier i-VU 1 September 2017 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: ALC WebCTRL Liebert SiteScan Carrier i-VU Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated Denial of Service -- Remote/Unauthenticated Provide Misleading Information -- Remote/Unauthenticated Access Confidential Data -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2016-5795 Original Bulletin: https://ics-cert.us-cert.gov/advisories/ICSA-17-150-01 Revision History: September 1 2017: Product tag update September 1 2017: Initial Release - --------------------------BEGIN INCLUDED TEXT-------------------- Advisory (ICSA-17-150-01) Automated Logic Corporation ALC WebCTRL, Liebert SiteScan, Carrier i-VU Original release date: August 31, 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 6.5 ATTENTION: Remotely exploitable/low skill level to exploit. Vendor: Automated Logic Corporation (ALC) Equipment: ALC WebCTRL, Liebert SiteScan, Carrier i-VU Vulnerability: XML External Entity (XXE) REPOSTED INFORMATION This advisory was originally posted to the NCCIC Portal on May 30, 2017, and is being released to the NCCIC/ICS-CERT web site. AFFECTED PRODUCTS The following ALC web-based building automation applications are affected: Liebert SiteScan Web Version 6.5, and prior; ALC WebCTRL Version 6.5, and prior; and Carrier i-Vu Version 6.5, and prior. IMPACT The vulnerability, if exploited, could lead to the disclosure of confidential data, denial of service (DoS), spoofing of a request from an upstream device, port scanning from the perspective of the machine where the parser is located, and other system impacts. Impact to individual organizations depends on many factors that are unique to each organization, including but not limited to whether the application was installed and is maintained in accordance with manufacturers recommendations. Risk of impact is significantly lower for those systems installed and maintained as set forth in ALCs system installation and maintenance guidelines. MITIGATION ALC applications should always be installed and maintained in accordance with the guidelines found here: http://www.automatedlogic.com/Pages/Security.aspx (link is external). In addition, ALC has released the following patches: WebCTRL 6.0, Cumulative Patch #11; WebCTRL 6.1, Cumulative Patch #4; and WebCTRL 6.5, Cumulative Patch #5. These patch releases may be obtained on the Automated Logic accounts web site or calling Technical Support at 770-429-3002: i-Vu 6.0, Cumulative Patch #11; and i-Vu 6.5, Cumulative Patch #5. These patch releases may be obtained by calling Technical Support at 800-277-9852: ICS-CERT recommends that users take defensive measures to minimize the risk of exploitation of this vulnerability. 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 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. 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. No known public exploits specifically target this vulnerability. VULNERABILITY OVERVIEW IMPROPER RESTRICTION OF XML EXTERNAL ENTITY REFERENCE ('XXE') CWE-611 An attacker could enter malicious input to WebCTRL, i-Vu, or SiteScan Web through a weakly configured XML parser causing the application to execute arbitrary code or disclose file contents from a server or connected network. CVE-2016-5795 has been assigned to this vulnerability. A CVSS v3 base score of 6.5 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L). RESEARCHER Evgeny Ermakov from Kaspersky Lab has identified the vulnerability. BACKGROUND Critical Infrastructure Sector: Commercial Facilities Countries/Areas Deployed: Worldwide Company Headquarters Location: Kennesaw, Georgia Contact Information For any questions related to this report, please contact ICS-CERT at: Email: ics-cert@hq.dhs.gov (link sends e-mail) 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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