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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2017.2710 A vulnerability has been identified in Rockwell Automation Stratix 5100 27 October 2017 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Rockwell Automation Stratix 5100 Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Access Privileged Data -- Remote/Unauthenticated Provide Misleading Information -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2017-13082 Reference: ESB-2017.2628 ESB-2017.2620 ESB-2017.2599 Original Bulletin: https://ics-cert.us-cert.gov/advisories/ICSA-17-299-02 - --------------------------BEGIN INCLUDED TEXT-------------------- Advisory (ICSA-17-299-02) Rockwell Automation Stratix 5100 Original release date: October 26, 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 6.9 ATTENTION: Public exploits are available. Vendor: Rockwell Automation Equipment: Stratix 5100 Wireless Access Point/Workgroup Bridge Vulnerability: Reusing a nonce AFFECTED PRODUCTS Rockwell Automation reports that the vulnerability affects the following wireless access point/ workgroup bridge products: Stratix 5100 Version 15.3(3)JC1 and earlier. IMPACT Successful exploitation of this vulnerability may allow the attacker to operate as a man-in-the-middle between the device and the wireless network. MITIGATION Rockwell Automation recommends that all users patch the clients that connect to the Stratix 5100 WAP/WGB, and recommends contacting your supplier to get the most updated patch that is compatible with your client devices. However, patching the client only protects the connection formed by that specific client. In order to protect all future clients that may be added to your system, Rockwell Automation recommends patching the Stratix 5100 WAP/WGB when the firmware is available. As new versions of firmware are released to remediate this vulnerability, Rockwell Automation will provide mitigation updates in their advisory. For more information about these vulnerabilities, mitigation updates, and Rockwell Automations general security guidelines, please see Rockwell Automations security advisory found at the following link. A login is required to view the advisory. https://rockwellautomation.custhelp.com/app/answers/detail/a_id/1066697 (link is external) Rockwell Automation also offers the following general security guidelines: Use trusted software, software patches, anti-virus/anti-malware programs, and interact only with trusted web sites and attachments. Block all traffic to EtherNet/IP or other CIP protocol-based devices from outside the Manufacturing Zone by blocking or restricting access to TCP and UDP Port 2222 and Port 44818 using proper network infrastructure controls, such as firewalls, Unified Threat Management (UTM) devices, or other security appliances. For more information on TCP/UDP ports used by Rockwell Automation Products, see Knowledge base Article ID 898270 (link is external). Help minimize network exposure for all control system devices and/or systems, and confirm 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 a VPN is only as secure as the connected devices. NCCIC/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. This vulnerability is not remotely exploitable. High skill level is needed to exploit. VULNERABILITY OVERVIEW REUSING A NONCE, KEY PAIR IN ENCRYPTION CWE-323 Key Reinstallation Attacks (KRACK) work against the four-way handshake of the WPA2 protocol. KRACK takes advantage of the retransmission of a handshake message to prompt the installation of the same encryption key every time it receives Message 3 from the access point. Retransmission of the handshake message from the access point occurs if a proper client acknowledgement is not received to the initial message; retransmission resets the nonce value and replay counter to their initial values. A malicious actor could force these nonce resets by replaying the appropriate handshake message, which could allow for injection and decryption of arbitrary packets, hijacking of TCP connections, injection of HTTP content, or replaying of unicast or multicast data frames on the targeted device. CVE-2017-13082 has been assigned to this vulnerability. A CVSS v3 base score of 6.9 has been calculated; the CVSS vector string is (AV:A/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:N). RESEARCHER Mathy Vanhoef, of the Katholieke Universiteit Leuven in Belgium discovered this vulnerability. BACKGROUND Critical Infrastructure Sectors: Critical Manufacturing, Energy, Water and Wastewater Systems Countries/Areas Deployed: Worldwide Company Headquarters Location: Wisconsin 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: https://www.auscert.org.au/bulletins/ =========================================================================== 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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