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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.4035 Advisory (icsa-21-334-03) Delta Electronics CNCSoft 1 December 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: CNCSoft Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction Resolution: Patch/Upgrade CVE Names: CVE-2021-43982 Original Bulletin: https://us-cert.cisa.gov/ics/advisories/icsa-21-334-03 - --------------------------BEGIN INCLUDED TEXT-------------------- ICS Advisory (ICSA-21-334-03) Delta Electronics CNCSoft Original release date: November 30, 2021 Legal Notice All information products included in https://us-cert.cisa.gov/ics 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 https://us-cert.cisa.gov/tlp/ . 1. EXECUTIVE SUMMARY o CVSS v3 7.8 o ATTENTION: Low attack complexity o Vendor: Delta Electronics o Equipment: CNCSoft o Vulnerability: Stack-based Buffer Overflow 2. RISK EVALUATION Successful exploitation of this vulnerability could allow for arbitrary code execution. 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS The following versions of CNCSoft, a software management platform, are affected: o CNCSoft: Version 1.01.30 and prior 3.2 VULNERABILITY OVERVIEW 3.2.1 STACK-BASED BUFFER OVERFLOW CWE-121 The affected product is vulnerable to a stack-based buffer overflow, which may allow an attacker to execute arbitrary code. CVE-2021-43982 has been assigned to this vulnerability. A CVSS v3 base score of 7.8 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:N/UI:R/S:U/ C:H/I:H/A:H ). 3.3 BACKGROUND o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing o COUNTRIES/AREAS DEPLOYED: Worldwide o COMPANY HEADQUARTERS LOCATION: Taiwan 3.4 RESEARCHER kimiya, working with Trend Micro's Zero Day Initiative, reported this vulnerability to CISA. 4. MITIGATIONS Delta Electronics has released an updated version of CNCSoft and recommends users install v1.01.31 and later on all affected systems. Delta Electronics recommends users should apply the following mitigations to reduce the risk of exploit: o Minimize network exposure for all control system devices and/or systems, and ensure they are not accessible from the Internet. o Locate control system networks and remote devices behind firewalls and isolate them from the business network. o When remote access is required, use secure methods, such as Virtual Private Networks (VPNs), recognizing a VPN is only as secure as its connected devices. CISA also recommends users take the following measures to protect themselves from social engineering attacks: o Do not click web links or open unsolicited attachments in email messages. o Refer to Recognizing and Avoiding Email Scams for more information on avoiding email scams. o Refer to Avoiding Social Engineering and Phishing Attacks for more information on social engineering attacks. CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures. CISA also provides a section for control systems security recommended practices on the ICS webpage on us-cert.cisa.gov . 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 on the ICS webpage on us-cert.cisa.gov in the Technical Information Paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies . Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to CISA for tracking and correlation against other incidents. No known public exploits specifically target this vulnerability. This vulnerability is not exploitable remotely. For any questions related to this report, please contact the CISA at: Email: CISAservicedesk@cisa.dhs.gov Toll Free: 1-888-282-0870 CISA 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 iQIVAwUBYaa/IONLKJtyKPYoAQjENA/+O5dhTwI+R4rcFUdQBL1rZsw6Cv+UQpmC 5BiTmDTLP2pOh5tI8wW33JmqXxSRGB/7qrqU5YFnwHI6SSIxnqZiO4DLIBHOurB0 TCeJqp5g/UAE0kEErhAnPpiayJf0mMqQ2TryHR4rZyp+65OiISPix8JafmzZNDVO ndN2etstfDfOKhRwaesdrcmMRMJsHWi5ObbcFwL71EMUaP8OKZT16DwPcrM6vLw3 4ir2U/IfjV+8tV6LjrbbLh34F72jFSr+8fpdgw62I7D8UzvnJAGGWiAX2uPVXncK SLpH/bhPtDIx+CDpRgPfgJHxBhRFoJO1HOagSF/hU+VWAaZz5TouxqVhmKETh7Nh BHLJZaWVSywEDOBKvhoxPj1Hc52RcR73qyXV53FwFAHFh/k+tf+raBMkViNPC6nl l5s3smGGpNLrpw8RVBzC4pD1k0vqQoGzvUaMg1Pt5CX9I/6AJWL+w26YSVmsGWkn PWng2nYFLMQM5zTICLJva2lm5Y7H+H+19mfsJ1XCT0mYnGieA+0Gl2OwUvU9fc4M DFU10hq5yG4AR8+hZSo8xaFCbK2tBCsF8WUjL4WinQQz6hybd88ruBBOxTKmX5Ov +Tu7NxT0OhxJ4Y8p5wNEiAxxMSIPy0nJE5kc8lDn1rKTYU4d325ItDh1Hxlcb+oi bdwLs4WITug= =i7+O -----END PGP SIGNATURE-----