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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2017.0634 Schneider Electric ClearSCADA Improper Input Validation 13 March 2017 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Schneider Electric ClearSCADA Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2017-6021 Original Bulletin: http://ics-cert.us-cert.gov/advisories/ICSA-17-068-01 - --------------------------BEGIN INCLUDED TEXT-------------------- Advisory (ICSA-17-068-01) Schneider Electric ClearSCADA Original release date: March 09, 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 7.5 ATTENTION: Remotely exploitable/low skill level to exploit. Vendor: Schneider Electric Equipment: ClearSCADA Vulnerability: Improper Input Validation AFFECTED PRODUCTS The following versions of ClearSCADA, server and communications driver processes, are affected: All supported versions including: ClearSCADA 2014 R1 (build 75.5210) and prior, ClearSCADA 2014 R1.1 (build 75.5387) and prior, ClearSCADA 2015 R1 (build 76.5648) and prior, ClearSCADA 2015 R2 (build 77.5882) and prior. IMPACT Successful exploitation of this vulnerability could cause the ClearSCADA server process and communications driver processes to terminate. MITIGATION Schneider Electric has released the following updates to mitigate the vulnerability: ClearSCADA 2014 R1.1 hotfix build 75.6239 ClearSCADA 2015 R1.1 Service Pack (build 76.6191) ClearSCADA 2015 R2 hotfix build 77.6181 Users of ClearSCADA 2013 R2 and prior versions should upgrade to the latest ClearSCADA 2015 R2 hotfix to mitigate the vulnerability. Each of the Service Pack and hotfixes above are available for direct download from Schneider Electrics web site at: http://resourcecenter.controlmicrosystems.com/display/CS/SCADA+Expert+ClearSCADA+Downloads (link is external) More information can be found by visiting Schneider Electrics Security Notification at: http://www.schneider-electric.com/en/download/document/SEVD-2017-060-01/ (link is external) Schneider Electric recommends users include the following measures in their SCADA strategies: Secure physical and network interfaces to the ClearSCADA system. Deploy suitably configured firewalls between network segments to limit access to ports and protocols appropriately. Deploy VPN technology with secure authentication on any externally accessible networks. Configure and audit user security to reduce the risk of a denial of service. For critical accounts use ClearSCADA security policy configuration to disable invalid logon count and delayed lockout time and to use logon throttling. 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 this vulnerability. VULNERABILITY OVERVIEW IMPROPER INPUT VALIDATION CWE-20 An attacker with network access to the ClearSCADA server can send specially crafted sequences of commands and data packets to the ClearSCADA server that can cause the ClearSCADA server process and ClearSCADA communications driver processes to terminate. CVE-2017-6021 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H). RESEARCHER Sergey Temnikov and Vladimir Dashchenko of Kapersky Labs Critical Infrastructure Defense Team identified and reported the vulnerability to Schneider Electric. BACKGROUND Critical Infrastructure Sector(s): Critical Manufacturing Countries/Areas Deployed: Worldwide Company Headquarters Location: Paris, France - --------------------------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: 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). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBWMYV1Yx+lLeg9Ub1AQi8RRAAjEBNSUHGdbdomfdl611rXYDkHuGWk/8v 2KPDrvzuau4gwPVQpKvZEb/Idg3cibbZHTXcViHBON26te1uZUsajou2d9bJMRYs Lbniz/MrXC9YjvqdsbXF1uEnwYVO4xZmk4qDHtN7zSJnp+5capHU4yRuscHmMBYn uIrfC+qhnSg4I6eDn60smsVQz7fRe93DG/ibrzyBpEHbLV/K1v6dWFV+AmpCoQ0u xkvFWlSJxhoeoPnSwYxitSlY2Gx+qWoWqrViGl7SvIA1aouP5rTzFJa81GFnYqim JlrSyhfsAJ3lV2d9MlRoVgPG3mBB7p7UV8crMOPFnGpXP1r1rBu7o5QQd50JD+04 f1prEjd0ZbiTLjOHGv4h1yNMSzBUEIi5h0K74eZ7wLpeb0uHMNYQTPEEDgH+Ny5W 6avIbbcGpbjRP0Q3hIDKBUNmb0Sxki7l2MTCkwSwXl3G+oBUAR1xFaFcw9gaIJxF kNFkUw3W/0GrG0HzzThPU2kXgqW0T1k9uCfVnNpehndyXSkJbtb1Zwh4rpPVFBUL 3Ae6oB7Ozu/EKhxX4OWJyZjEY1in2ks8wSFSZ2Nb3qoyw8EQYErjlXtIZfn+7flm HlBNEbi8WMWKKEwz8dblnZxeyz5nGj9tvT58/6cGaQlnNjBDATGYEEM5UU5szTwL l6avi21C6Hg= =iyQQ -----END PGP SIGNATURE-----