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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.3351 Advisory (icsa-21-280-06) FATEK Automation WinProladder 8 October 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: FATEK Automation WinProladder Publisher: ICS-CERT Operating System: Windows Impact/Access: Execute Arbitrary Code/Commands -- Existing Account Access Confidential Data -- Existing Account Resolution: Mitigation CVE Names: CVE-2021-38442 CVE-2021-38440 CVE-2021-38438 CVE-2021-38436 CVE-2021-38434 CVE-2021-38430 CVE-2021-38426 Original Bulletin: https://us-cert.cisa.gov/ics/advisories/icsa-21-280-06 - --------------------------BEGIN INCLUDED TEXT-------------------- ICS Advisory (ICSA-21-280-06) FATEK Automation WinProladder Original release date: October 07, 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: Exploitable remotely/low attack complexity o Vendor: FATEK Automation o Equipment: WinProladder o Vulnerabilities : Out-of-bounds Write, Out-of-bounds Read, Unexpected Sign Extension, Stack-based Buffer Overflow, Improper Restriction of Operations within the Bounds of a Memory Buffer, Use After Free 2. RISK EVALUATION Successful exploitation of these vulnerabilities may allow arbitrary code execution, remote code execution, heap corruption, and unauthorized information disclosure. 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS The following versions of FATEK Automation WinProladder, a PLC programming software are affected: o WinProladder: Versions 3.30 and prior 3.2 VULNERABILITY OVERVIEW 3.2.1 USE AFTER FREE CWE-416 A use after free vulnerability may be exploited when a valid user opens a malformed project file, which may allow arbitrary code execution. CVE-2021-38438 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 ). 3.2.2 OUT-OF-BOUNDS WRITE CWE-787 The affected product lacks proper validation of user-supplied data when parsing project files, which could result in an out-of-bounds write. An attacker could leverage this vulnerability to execute arbitrary code. CVE-2021-38426 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 ). 3.2.3 UNEXPECTED SIGN EXTENSION CWE-194 The affected product lacks proper validation of user-supplied data when parsing project files, which could result in an unexpected sign extension. An attacker could leverage this vulnerability to execute arbitrary code. CVE-2021-38434 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 ). 3.2.4 STACK-BASED BUFFER OVERFLOW CWE-121 The affected product lacks proper validation of user-supplied data when parsing project files, which could result in a stack-based buffer overflow. An attacker could leverage this vulnerability to execute arbitrary code. CVE-2021-38430 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 ). 3.2.5 IMPROPER RESTRICTION OF OPERATIONS WITHIN THE BOUNDS OF A MEMORY BUFFER CWE-119 The affected product lacks proper validation of user-supplied data when parsing project files, which could result in a memory-corruption condition. An attacker could leverage this vulnerability to execute arbitrary code in the context of the current process. CVE-2021-38436 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 ). 3.2.6 IMPROPER RESTRICTION OF OPERATIONS WITHIN THE BOUNDS OF A MEMORY BUFFER CWE-119 The affected product lacks proper validation of user-supplied data when parsing project files, which could result in a heap-corruption condition. An attacker could leverage this vulnerability to execute code in the context of the current process. CVE-2021-38442 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 ). 3.2.7 OUT-OF-BOUNDS READ CWE-125 The affected product is vulnerable to an out-of-bounds read, which may allow an attacker to read unauthorized information. CVE-2021-38440 has been assigned to this vulnerability. A CVSS v3 base score of 3.3 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:N/UI:R/S:U/ C:L/I:N/A:N ). 3.3 BACKGROUND o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing o COUNTRIES/AREAS DEPLOYED: Worldwide o COMPANY HEADQUARTERS LOCATION: Taiwan 3.4 RESEARCHER xina1i and Natnael Samson (@NattiSamson), working with Trend Micro's Zero Day Initiative, reported these vulnerabilities to CISA. 4. MITIGATIONS FATEK Automation has not responded to requests to work with CISA to mitigate these vulnerabilities. Users of these affected products are invited to contact FATEK customer support for additional information. 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 these vulnerabilities. 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. 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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: 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). 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