12 May 2017
Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2017.1202 Advisory (ICSA-17-131-01) Phoenix Contact GmbH mGuard 12 May 2017 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Phoenix Contact GmbH mGuard Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Denial of Service -- Remote/Unauthenticated Unauthorised Access -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2017-7937 CVE-2017-7935 Original Bulletin: https://ics-cert.us-cert.gov/advisories/ICSA-17-131-01 - --------------------------BEGIN INCLUDED TEXT-------------------- Advisory (ICSA-17-131-01) Phoenix Contact GmbH mGuard Original release date: May 11, 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 8.6 ATTENTION: Remotely exploitable/low skill level to exploit Vendor: Phoenix Contact GmbH Equipment: mGuard Vulnerabilities: Resource Exhaustion, Improper Authentication AFFECTED PRODUCTS The following versions of mGuard, a network device, are affected: mGuard firmware versions 8.3.0 to 8.4.2 IMPACT Successful exploitation of these vulnerabilities could allow an attacker to disrupt the availability of the device and gain unauthorized access to the device. MITIGATION Phoenix Contact GmbH recommends that users upgrade to firmware Version 8.5.0, or higher, to mitigate the vulnerabilities. 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 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 these vulnerabilities. VULNERABILITY OVERVIEW RESOURCE EXHAUSTION CWE-400 An attacker may compromise the devices availability by performing multiple initial VPN requests. CVE-2017-7935 has been assigned to this vulnerability. A CVSS v3 base score of 8.6 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H). IMPROPER AUTHENTICATION CWE-287 An attacker may be able to gain unauthorized access to the user firewall when RADIUS servers are unreachable. CVE-2017-7937 has been assigned to this vulnerability. A CVSS v3 base score of 4.0 has been assigned; the CVSS vector string is (AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N). RESEARCHER Phoenix Contact GmbH self-reported these vulnerabilities. BACKGROUND Critical Infrastructure Sector: Critical Manufacturing Countries/Areas Deployed: Worldwide Company Headquarters Location: Germany - --------------------------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 firstname.lastname@example.org 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: email@example.com 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 iQIVAwUBWRUkKYx+lLeg9Ub1AQgnkhAAhyVY4juuFoc1DeGbxiwHXPuQCY9Nwxqu vd5xEnOwGuVs7V6iC1+LK11SWwQSa9nRnEntAeS9kDxvfMuy8M3lXnuR/hoaIlMc BXHX/5sHUetjF6AE86gudYwB0j5lFkN2FrfMLz9BBfeY1nLDAPeqbi/ApGC4bg6K 9B8T9pirhRmkNvvI9JcWa0Otm1PMtsvLayJVnB5Fsgkf8yXAP25WRbTbUETMj2Y5 gRLwenwamTySZkjOjWg9Hc6FtwaX/WOSOMccrqiy3jg16i58QB58okaGmjTW/d0W n7oJpOqG/MdBq06iW0fAS/QCZwfQV+Cg8PHeTV9YE7hf7hrk3eH30TLLEPqGUyJd GPFUw+b4NX/uJNXRBwgT4OPRQr/x7+1R40exOZIdpkWohXL8he+ci07xz2Xkw2cL CI2rXqtXNP9UHUbeIKgKNpesNc2wReMDs3MdoH6LLrtJG/47oVeo+mvwwLoiB7qg 0XsvrM5FLT1XBhLAboCbkr2vg2t0OThE0QlP8b9VViHFK3PTlE2dia9/gsuIZrDS H7heBxmgfDEO0TWM9od2+KSEmv7YrM/xLGaBVR/UwKg7N4hm8oYQ/8dUaf+xaJF9 T11ZHaVjO4RGAmAclkKW/eEMpFXGUoHe0ApWZZ1iyVOOAvOYf7P+/a/rBt59G+RN N3PGV25+n9M= =nFuT -----END PGP SIGNATURE-----