28 March 2018
Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2018.0891.2 Advisory (ICSA-18-086-01) Schneider Electric Modicon Premium, Modicon Quantum, Modicon M340, and Modicon BMXNOR0200 28 March 2018 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Schneider Electric Modicon Premium Schneider Modicon Quantum Schneider Modicon M340 Schneider Modicon BMXNOR0200 Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Execute Arbitrary Code/Commands -- Existing Account Denial of Service -- Existing Account Unauthorised Access -- Remote/Unauthenticated Access Confidential Data -- Existing Account Resolution: Mitigation CVE Names: CVE-2018-7242 CVE-2018-7241 CVE-2018-7240 Original Bulletin: https://ics-cert.us-cert.gov/advisories/ICSA-18-086-01 Revision History: March 28 2018: Mitigation steps March 28 2018: Initial Release - --------------------------BEGIN INCLUDED TEXT-------------------- Advisory (ICSA-18-086-01) Schneider Electric Modicon Premium, Modicon Quantum, Modicon M340, and Modicon BMXNOR0200 Original release date: March 27, 2018 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 5.9 ATTENTION: Exploitable remotely/low skill level to exploit. Vendor: Schneider Electric Equipment: Modicon Premium, Modicon Quantum, Modicon M340, and Modicon BMXNOR0200 Vulnerabilities: Stack-based Buffer Overflow, Use of Hard-coded Credentials, Use of a Broken or Risky Cryptographic Algorithm. AFFECTED PRODUCTS The following versions of Modicon PLCs are affected: Modicon Premium all versions, Modicon Quantum all versions, Modicon M340 all versions, and Modicon X80 RTU (BMXNOR0200H) all versions. IMPACT Successful exploitation of these vulnerabilities could allow a remote unauthorized attacker access to the file transfer service on the device, which could result in arbitrary code execution or malicious firmware installation. MITIGATION Schneider Electric recommends that users follow the instructions outlined in the Modicon Controllers Platform - Cyber Security, Reference Manual (link is external) to install Modicon PLCs securely. Schneider Electric also recommends that affected users disable FTP services on the device during times when maintenance or configuration activities are not needed. For more information please see Schneider Electrics security notification SEVD-2018-081-01 at: https://www.schneider-electric.com/en/download/document/SEVD-2018-081-01/ (link is external) NCCIC recommends 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. NCCIC reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures. NCCIC 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 NCCIC Technical Information Paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies, that is available for download from the ICS-CERT website. Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to NCCIC for tracking and correlation against other incidents. No known public exploits specifically target these vulnerabilities. VULNERABILITY OVERVIEW STACK-BASED BUFFER OVERFLOW CWE-121 The FTP server does not limit the length of a command parameter which may cause a buffer overflow condition. CVE-2018-7240 has been assigned to this vulnerability. A CVSS v3 base score of 4.8 has been calculated; the CVSS vector string is (AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:H). USE OF HARD-CODED CREDENTIALS CWE-798 The FTP servers contain a hard-coded account, which could allow unauthorized access. CVE-2018-7241 has been assigned to this vulnerability. A CVSS v3 base score of 5.9 has been calculated; the CVSS vector string is (AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:H). USE OF A BROKEN OR RISKY CRYPTOGRAPHIC ALGORITHM CWE-327 The FTP server does not limit the length of a command parameter, which may cause a buffer overflow condition. CVE-2018-7242 has been assigned to this vulnerability. A CVSS v3 base score of 5.9 has been calculated; the CVSS vector string is (AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:H). RESEARCHER Nikita Maximov, Alexey Stennikov, and Kirill Chernyshov of Positive Technologies reported the vulnerabilities to Schneider Electric. Meng Leizi and Zhang Daoquan reported the vulnerabilities to NCCIC. BACKGROUND Critical Infrastructure Sector: Critical Manufacturing Countries/Areas Deployed: Worldwide Company Headquarters Location: 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 email@example.com 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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On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBWrr8y4x+lLeg9Ub1AQhKyA//Yd9vhqlSYg0/bsrt4dXYg4yQmnYYREN8 PBRQBUUhUy6CH/b0C/dJWDTFkQt8E2Imsq696q/hZuSJJJgFtOGqh53gnu8iKt2X tGFyLV5kNnVC3DA+VXQzxfK0FTR3CNOZ7GMsr8ikABu9OgFu8E63hFegnawCEJ66 AYxZjGEN2BATjrndCXEYyHRVGZ3vA0rMEQMiXKV1v2s+AM7aN6X9jm+U1vVm9ebV XxEv2AHIt0dikR1DFzWiN19m1+fHg7yo0mj02K8H8ozLV71unGx6+u81UgplK4Ih 7L3wkOapKkIHB0NPpLHkxyIcjbJcu55HsFWhjgue3HCsm5J5XePH6wbVozUh5f4o ExRsdODnbE7h/3xaYsgK6ceFKP2Gz57kwXUeMUeTu4oPO3vpr/ZCNWmwgTdl3DP7 quGJX03PrTrZ0ZLNT/hfKBvSnFX6Msq2BP3CJd+R37hE2qtZ7+J85f693dZh4G3s +EizlinimrjgQgwvQvkXsoXhvpwIejydxrm1QFTRPI7DJQln87zYdK4OF6jZaNhd KOufytmn3ZXbeyHDlgqYoS/g4kz7P9x76/PhqsGtjCxveEKFTD2MXzlq7WhfuR6V yFzOkdvdYwMSmh1Y0sM8vNSxLoUj0sSi6dGakhYnAqB5z/8sNH7v2YibVPbiMaAl g5Btz4anxLs= =gowX -----END PGP SIGNATURE-----