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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2017.2905 Key Reinstallation Attacks against TropOS Devices 15 November 2017 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: TropOS Publisher: ABB Operating System: Network Appliance Impact/Access: Access Privileged Data -- Remote/Unauthenticated Provide Misleading Information -- Remote/Unauthenticated Resolution: Mitigation CVE Names: CVE-2017-13077 CVE-2017-13078 CVE-2017-13079 CVE-2017-13080 CVE-2017-13081 CVE-2017-13082 CVE-2017-13084 CVE-2017-13086 CVE-2017-13087 CVE-2017-13088 Reference: ESB-2017.2599 ESB-2017.2600 ESB-2017.2601.3 Original Bulletin: https://ics-cert.us-cert.gov/advisories/ICSA-17-318-02 - --------------------------BEGIN INCLUDED TEXT-------------------- Advisory (ICSA-17-318-02) ABB TropOS Original release date: November 14, 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 6.8 Vendor: ABB Equipment: TropOS Vulnerabilities: Security Features AFFECTED PRODUCTS ABB reports that the key reinstallation attacks (KRACK) potentially affect all TropOS broadband mesh routers and bridges operating on Mesh OS release 8.5.2 or prior. IMPACT Successful exploitation of these vulnerabilities could allow an attacker to decrypt, replay, and forge some frames on a WPA2 encrypted network. MITIGATION ABB is working on remedial actions for all affected products. ABB has released an advisory (1KHW02890) on their alerts and notification page: http://search-ext.abb.com/library/Download.aspx?DocumentID=1KHW02890&Action= Launch This advisory will be updated when firmware, including remedial measures, is available. The TropOS mesh wireless interfaces are not vulnerable. Wired client interfaces (Ethernet, Serial) are not vulnerable. An attacker must be in physical proximity of the Wi-Fi access point and connected client to be successful. If the communication across the Wi-Fi link is encrypted at Layer 3 (e.g., SSH, SSL, HTTPS, or SNMPv3 encrypted), privacy is maintained during an otherwise successful attack. If possible, encrypt communication across the Wi-Fi link at Layer 3 using SSH, SSL, HTTPS, or SNMPv3. There is no complete workaround which allows protected Wi-Fi access to the TropOS Mesh. ABB users with a current Complete Software Care or Complete Software + Hardware Care subscription are advised to contact ABB Wireless support on phone +1(408) 331 6800, ext. 4, or email tropos.support@nam.abb.com. 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. These vulnerabilities have been publicly disclosed. These vulnerabilities are exploitable from adjacent networks. High skill level is needed to exploit. VULNERABILITY OVERVIEW SECURITY FEATURES CWE-254 An industry-wide vulnerability exists in the WPA2 key management algorithm devices that use IEEE 802.11w, including the TropOS broadband mesh routers listed above. The vulnerability may allow an attacker to decrypt, replay, and forge some frames on a WPA2 encrypted network. The following CVEs have been assigned to this group of vulnerabilities: CVE-2017-13077: reinstallation of the pairwise key in the four-way handshake, CVE-2017-13078: reinstallation of the group key in the four-way handshake, CVE-2017-13079: reinstallation of the integrity group key in the four-way handshake, CVE-2017-13080: reinstallation of the group key in the group key handshake, CVE-2017-13081: reinstallation of the integrity group key in the group key handshake, CVE-2017-13082: accepting a retransmitted fast BSS transition reassociation request and reinstalling the pairwise key while processing it, CVE-2017-13084: reinstallation of the STK key in the PeerKey handshake, CVE-2017-13086: reinstallation of the tunneled direct-link setup (TDLS) PeerKey (TPK) key in the TDLS handshake, CVE-2017-13087: reinstallation of the group key (GTK) when processing a wireless network management (WNM) sleep mode response frame, and CVE-2017-13088: reinstallation of the integrity group key (IGTK) when processing a wireless network management (WNM) sleep mode response frame. A CVSS v3 base score of 6.8 has been calculated; the CVSS vector string is (AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N). RESEARCHER Mathy Vanhoef, of the Katholieke Universiteit Leuven in Belgium, discovered this vulnerability. BACKGROUND Critical Infrastructure Sectors: Critical Manufacturing, Energy Countries/Areas Deployed: Worldwide Company Headquarters Location: Switzerland 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 - --------------------------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). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBWgvblIx+lLeg9Ub1AQg5KQ//ZrCdHAtfWYJarUFosGp9hoYr2SW10GKa X/HRxXIeXOGPCTbELpzJa8XFeT286mOUd4pOzAUNldHXcXIU4F73py4vmcdVALuw SZZtcKfuDPoY4s8hB+77y29gqqUuM40nCq+c4KzxIXEXvv0qNflYj3uGTCXgPYxj baqyeV79qQGaja4kRvTAfVCnONznLdF73XALB9kIQFVFYGk2w1Bk0VzJCyf0eW0S GRknJtDVZKUhp25iaWJDkseZ18ucqdZvK3vChUIxZ5FdOArdyrr+GKTV+Spl8OoM sNA0Zlkeuyn1l67vbkow/fR4BBfS+FS4As+lD0nMI3SmHtrjPk7e9A06uAZ0FsQ3 bP/hx/QcplznHDwlDyRxc6FGQNkcF4MVyBR4IyoydzEIziCHxUDgpo6dK0bK44fd lfe0fkKljlHsobAjs6k+2cUWn3pugtd7oxhj6HAnIAgRM5V9eTmBXoT32Zbr4nTN 2/QXfHYRRdtPogKIGI4LRU/4vn+tIi7GgNaO+wybwdTFYaqJR6i9mmg60VB3VybD rDhFRELAsdUMe6YJnm57jR4f/QsrdYlv8UuWiVt3X+fa7AVqjRSSyEGUBRt+Haq5 aXFfCCrLowsBPoetqzo6tCSMwwhbmyh9MDRSU483kxYFoCS4JNihp6KfjbYhWO3S D/SCUGnmMY4= =rBVH -----END PGP SIGNATURE-----