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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2016.2193 Rockwell Automation RSLogix 500 AND RSLogix Micro File Parser Buffer Overflow Vulnerability 16 September 2016 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Rockwell Automation RSLogix Micro Rockwell Automation RSLogix 500 Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Execute Arbitrary Code/Commands -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2016-5814 Original Bulletin: https://ics-cert.us-cert.gov/advisories/ICSA-16-224-02 - --------------------------BEGIN INCLUDED TEXT-------------------- Advisory (ICSA-16-224-02) Rockwell Automation RSLogix 500 AND RSLogix Micro File Parser Buffer Overflow Vulnerability Original release date: September 15, 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 was originally posted to the US-CERT secure Portal library on August 11, 2016, and is being released to the ICS-CERT web site. Ariele Caltabiano (kimiya) working with Trend Micros Zero Day Initiative has identified a parser buffer overflow vulnerability in Rockwell Automations RSLogix Starter Lite. Rockwell Automation investigated the matter and found that it also affected RSLogix 500 and other versions of RSLogix Micro. Rockwell Automation has produced a patch to mitigate this vulnerability in Version 8.40.00 AFFECTED PRODUCTS Rockwell Automation reports that the vulnerability affects the following products: RSLogix Micro Starter Lite, all versions, RSLogix Micro Developer, all versions, RSLogix 500 Starter Edition, all versions, RSLogix 500 Standard Edition, all versions, and RSLogix 500 Professional Edition, all versions. IMPACT A successful attack may potentially allow malicious code to execute on the target computer at the same privilege level as the logged-in user. The impact to the users environment is highly dependent on both the type of malicious code included in the attack and the mitigations that the user may already employ. Impact to individual organizations depends on many factors that are unique to each organization. NCCIC/ICS-CERT recommends that organizations evaluate the impact of this vulnerability based on their operational environment, architecture, and product implementation. BACKGROUND Rockwell Automation, which is a US-based company, provides industrial automation control and information products worldwide across a wide range of industries. The affected products, RSLogix 500 and RSLogix Micro, are design and configuration software used with certain Rockwell Automation products. According to Rockwell Automation, the software is for use in systems deployed across several sectors, including Chemical, Critical Manufacturing, Food and Agriculture, Water and Wastewater Systems, and others. Rockwell Automation estimates that this product is used worldwide. VULNERABILITY CHARACTERIZATION VULNERABILITY OVERVIEW CLASSIC BUFFER OVERFLOW [a] The discovered vulnerability exists in the code that opens and parses the RSLogix 500 and RSLogix Micro project files with an RSS extension. In order for attackers to exploit this vulnerability in RSLogix 500 and RSLogix Micro, they must create a malicious RSS file. The buffer overflow condition is exploited if an affected version of the product opens a malicious project file. If the attack is successful, the malicious code will run at the same privilege level as the user who is logged into the machine. CVE-2016-5814 [b] has been assigned to this vulnerability. A CVSS v3 base score of 8.6 has been calculated; the CVSS vector string is (CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H). [c] VULNERABILITY DETAILS EXPLOITABILITY This vulnerability is not exploitable remotely and cannot be exploited without user interaction. The exploit is only triggered when a local user runs the vulnerable application and loads the malformed RSS file. EXISTENCE OF EXPLOIT No known public exploits specifically target this vulnerability. DIFFICULTY Crafting a working exploit for this vulnerability would be easy. An exploit would require social engineering to convince the user to accept the malformed RSS file. Additional user interaction is needed to load the malformed file. This decreases the likelihood of a successful exploit. MITIGATION Rockwell Automation recommends the following precautionary measures as additional risk mitigation strategies for this type of attack. If possible, employ multiple strategies simultaneously. - - Users using affected versions of RSLogix 500 and RSLogix Micro are encouraged to apply the patch that addresses associated risk and includes added improvements to further harden the software and enhance its resilience against similar malicious attacks. * RSLogix Micro version 8.40.00 or RSLogix 500 version 8.40.00: Apply patch KB878490, which can be found on Rockwell Automations web site at the following URL with a valid account: https://rockwellautomation.custhelp.com/app/answers/detail/a_id/878490 (link is external) - - Do not open untrusted RSS files with RSLogix 500 and RSLogix Micro. - - Run all software as user, not as an administrator to minimize the impact of malicious code on the infected system. - - Use trusted software, software patches, and anti-virus/anti-malware 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. - - Use of Microsoft AppLocker or other similar whitelisting application can help mitigate risk. Information on using AppLocker with Rockwell Automation products is available at the following URL with a valid account: https://rockwellautomation.custhelp.com/app/answers/detail/a_id/546989 (link is external). - - 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. For more information on this issue, please see Rockwell Automations publication KB89582 on its web site at: http://www.rockwellautomation.com/rockwellsoftware/support/knowledgebase.page (link is external) 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 [d] for more information on avoiding email scams. - - Refer to Avoiding Social Engineering and Phishing Attacks [e] for more information on social engineering attacks. 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 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 (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-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow'), http://cwe.mitre.org/data/definitions/120.html, web site last accessed August 11, 2016. b. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-5814, 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, https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S..., web site last accessed August 11, 2016. d. Recognizing and Avoiding Email Scams, http://www.us-cert.gov/reading_room/emailscams_0905.pdf, web site last accessed August 11, 2016. e. National Cyber Alert System Cyber Security Tip ST04-014, http://www.us-cert.gov/cas/tips/ST04-014.html, web site last accessed August 11, 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. 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. 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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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