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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2018.1187 Advisory (ICSA-18-107-02) - Schneider Electric Triconex Tricon 18 April 2018 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Schneider Electric Triconex Tricon Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated Access Privileged Data -- Remote/Unauthenticated Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2018-8872 CVE-2018-7522 Original Bulletin: https://ics-cert.us-cert.gov/advisories/ICSA-18-107-02 - --------------------------BEGIN INCLUDED TEXT-------------------- Advisory (ICSA-18-107-02) Schneider Electric Triconex Tricon 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/. 1. EXECUTIVE SUMMARY CVSS v3 10.0 ATTENTION: Exploitable remotely/low skill level to exploit/HatMan malware specifically targets these vulnerabilities. Vendor: Schneider Electric Equipment: Triconex Tricon, model 3008 Vulnerabilities: Improper Restriction of Operations within the Bounds of a Memory Buffer 2. RISK EVALUATION Successful exploitation of these vulnerabilities could misinform or control the Safety Instrumented System which could result in arbitrary code execution, system shutdown, or the compromise of safety systems. 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS The following versions of Triconex Tricon, a Safety Instrumented System, are affected: MP model 3008 firmware versions 10.0-10.4 3.2 VULNERABILITY OVERVIEW 3.2.1 IMPROPER RESTRICTION OF OPERATIONS WITHIN THE BOUNDS OF A MEMORY BUFFER CWE-119 The system call reads directly from memory addresses within the control program area without any verification. Manipulating this data could allow attacker data to be copied anywhere within memory. CVE-2018-8872 has been assigned to this vulnerability. A CVSS v3 base score of 10.0 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H). 3.2.2 IMPROPER RESTRICTION OF OPERATIONS WITHIN THE BOUNDS OF A MEMORY BUFFER CWE-119 When a system call is made, registers are stored to a fixed memory location. Modifying the data in this location could allow attackers to gain supervisor-level access and control system states. CVE-2018-7522 has been assigned to this vulnerability. A CVSS v3 base score of 7.9 has been assigned; the CVSS vector string is (AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:H). 3.3 BACKGROUND - Critical Infrastructure Sectors: Multiple Sectors - Countries/Areas Deployed: Worldwide - Company Headquarters Location: France 3.4 RESEARCHER This vulnerability was discovered by NCCIC and Schneider Electric during the investigation of the HatMan malware. 4. MITIGATIONS Schneider Electric recommends that customers upgrade their firmware to the latest 11.x version. Contact Schneider Electric support for instructions. The HatMan malware requires unrestricted access to the safety network via remote network or physical access. Additionally, the malware requires the Tricon key switch to be in the "PROGRAM" mode to successfully deploy its payload. Schneider Electric continues to recommend users always implement the instructions in the "Security Considerations" section in the standard Triconex documentation (i.e., Planning and Installation Guides and TriStation 1131 Developers Guide), which include the following: - Ensure the cybersecurity features in Triconex solutions are always enabled. - Safety systems must always be deployed on isolated networks. - Physical controls should be in place so that no unauthorized person would have access to the safety controllers, peripheral safety equipment, or the safety network. - All controllers should reside in locked cabinets and never be left in the "PROGRAM" mode. - All TriStation engineering workstations should be secured and never be connected to any network other than the safety network. - All methods of mobile data exchange with the isolated safety network such as CDs, USB drives, DVD's, etc. should be scanned before use in the TriStation engineering workstations or any node connected to this network. - Laptops and PCs should always be properly verified to be virus and malware free before connecting to the safety network or any Triconex controller. - Operator stations should be configured to display an alarm whenever the Tricon key switch is in the "PROGRAM" mode. NCCIC recommends that users take defensive measures to minimize the risk of exploitation of these vulnerabilities. Specifically, users should: - Minimize network exposure for all Safety Instrumented Systems, and ensure that they are not accessible from the Internet. - Locate Safety Instrumented Systems behind firewalls, and isolate them from all other networks. - 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 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 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. NCCIC also recommends that users take the following measures to protect themselves from social engineering attacks: - Do not click web links or open unsolicited attachments in email messages. - Refer to Recognizing and Avoiding Email Scams for more information on avoiding email scams. - Refer to Avoiding Social Engineering and Phishing Attacks for more information on social engineering attacks. Contact Information For any questions related to this report, please contact the NCCIC at: Email: NCCICCUSTOMERSERVICE@hq.dhs.gov Toll Free: 1-888-282-0870 For industrial control systems cybersecurity information: http://ics-cert.us-cert.gov or incident reporting: https://ics-cert.us-cert.gov/Report-Incident? The NCCIC 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. 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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 iQIVAwUBWtbVSYx+lLeg9Ub1AQgw3w//TqGxglGQjFDCyRECkbYFw236mMkJTv6A pVmve8aM9vdhRg1Jq9C0f5/V6gh/gECLBP+MSBF/RMGLKQOqC4PdmDPfnykCQU96 j86N2cO0/MXZJ3/sRIv2bnVMtqOv5UKPP+af2Q7jDn4ZubaR/06A+9bL7BEM+Fqa /fizOPa64piZ0Q9A5d4/5eo4lTXCsISaaoHWRqMnV+Ui212IYssOAtG4WBqSdxzI ZXIjIheTqqoYgIH+GbGv9wxvKVFelcmuqL4meFxubGJP21kpgVwSHcOW6gWdjz9q rqlR1QL9fkJUZer/7DOOp//vIc0BlmNdBeNwZo5ti8FMNYvZ4f+xbjabMZCDl3f8 sMAMEtFJypAHwxI8K0pc7FA5L76fEHobVathFr+IznUyu8zxioodWmkg99sl2AAC nYQgQhMDfeGbqoBQI+CHJdEXmt8WRKEZJxyoOM40DUambrfJNmdlSSdl62jsMEGh jBI0G13Bm/HD8Tfhki9eEM1/VdKlMuNIrHtQXM6EQ951mJ3zAWra+dB0mbBWgfY6 avyQO9W4STMx8licliFctmVlfezF7DrD8s2XtwPHtFa1L9BVSCQLxp0dIO2O7p90 U6RfBqG7r19FA0i6I4EZCSUannaJpT9fLmq+7fOZ2sAc6ZV6MsVNlwtZWuM72CBE +SXtU38Puyo= =vLdB -----END PGP SIGNATURE-----