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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2016.0565 Rockwell Automation Allen-Bradley CompactLogix Reflective Cross-Site Scripting Vulnerability 3 March 2016 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Rockwell Automation Allen-Bradley CompactLogix controller Publisher: US-CERT Operating System: Network Appliance Impact/Access: Cross-site Scripting -- Remote with User Interaction Resolution: Patch/Upgrade CVE Names: CVE-2016-2279 Original Bulletin: https://ics-cert.us-cert.gov/advisories/ICSA-16-061-02 - --------------------------BEGIN INCLUDED TEXT-------------------- Advisory (ICSA-16-061-02) Rockwell Automation Allen-Bradley CompactLogix Reflective Cross-Site Scripting Vulnerability Original release date: March 01, 2016 | Last revised: March 02, 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 This advisory is a follow-up to the alert titled ICS-ALERT-15-225-01A Rockwell Automation 1766-L32 Series Vulnerability[a] that was published August 13, 2015, on the NCCIC/ICS-CERT web site. Independent researcher Aditya Sood has identified a cross-site scripting vulnerability in Rockwell Automations CompactLogix controller. This vulnerability has been publicly disclosed. Rockwell Automation has produced a new firmware version to mitigate this vulnerability. This vulnerability could be exploited remotely. AFFECTED PRODUCTS Rockwell Automation reports that the vulnerability affects the following versions of the Allen-Bradley CompactLogix controller platform: 1769-L16ER-BB1B, Version 27.011 and earlier, 1769-L18ER-BB1B, Version 27.011 and earlier, 1769-L18ERM-BB1B, Version 27.011 and earlier, 1769-L24ER-QB1B, Version 27.011 and earlier, 1769-L24ER-QBFC1B, Version 27.011 and earlier, 1769-L27ERM-QBFC1B, Version 27.011 and earlier, 1769-L30ER, Version 27.011 and earlier, 1769-L30ERM, Version 27.011 and earlier, 1769-L30ER-NSE, Version 27.011 and earlier, 1769-L33ER, Version 27.011 and earlier, 1769-L33ERM, Version 27.011 and earlier, 1769-L36ERM, Version 27.011 and earlier, 1769-L23E-QB1B, Version 20.018 and earlier (Will be discontinued in June 2016), and 1769-L23E-QBFC1B, Version 20.018 and earlier (Will be discontinued in June 2016). IMPACT A successful exploit using this vulnerability could affect the availability of the target device. 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 Rockwell Automation is a US-based company that maintains offices around the world. The affected products, CompactLogix, are controllers that include a web server. According to Rockwell Automation, these products are deployed across several sectors including Chemical, Critical Manufacturing, Food and Agriculture, Water and Wastewater Systems, and others. Rockwell Automation estimates that these products are used worldwide. VULNERABILITY CHARACTERIZATION VULNERABILITY OVERVIEW CROSS-SITE SCRIPTING[b] The vulnerability in the CompactLogixs webserver allows an attacker to inject arbitrary JavaScript into an unsuspecting users web browser. The target of this type of attack is not the CompactLogix itself. Instead, the CompactLogix is a vehicle to deliver an attack to the web browser. CVE-2016-2279[c] 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:N/UI:R/S:C/C:L/I:L/A:N).[d] VULNERABILITY DETAILS EXPLOITABILITY This vulnerability could be exploited remotely. EXISTENCE OF EXPLOIT This vulnerability was publicly disclosed; it is unknown if there are public exploits that specifically target this vulnerability. DIFFICULTY An attacker with a low skill would be able to exploit this vulnerability. MITIGATION Rockwell Automation recommends that users of 1769-L23E-QB1B migrate to 1769-L24ER-BB1B and users of 1769-L23E-QBFC1B migrate to 1769-L24ER-QBFC1B. For the other affected versions listed above, Rockwell Automation recommends that users apply firmware Version 28.011+ available at: http://compatibility.rockwellautomation.com/Pages/MultiProductDownload.aspx?famID=4 (link is external) For more detailed information, please see Rockwell Automations security notification (KB731098 ) at the following URL, with a valid account: https://rockwellautomation.custhelp.com/app/answers/detail/a_id/731098 (link is external) (link is external) Rockwell Automation also recommends the following security practices: Use trusted software, software patches, antivirus/antimalware programs and interact only with trusted web sites and attachments. Employ training and awareness programs to educate users on the warning signs of a phishing or social engineering attack. 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 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. ICS-ALERT-15-225-02A - Rockwell Automation 1766-L32 Series Vulnerability, https://ics-cert.us-cert.gov/alerts/ICS-ALERT-15-225-02A, web site last accessed March 01, 2016. b. CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'), http://cwe.mitre.org/data/definitions/79.html, web site last accessed March 01, 2016. c. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-2279, 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, https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S... , web site last accessed March 01, 2016. 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. 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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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