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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.1487 Advisory (icsa-21-119-01) Texas Instruments SimpleLink 30 April 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Texas Instruments SimpleLink Products Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated Denial of Service -- Remote/Unauthenticated Access Confidential Data -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2021-22679 CVE-2021-22677 CVE-2021-22675 CVE-2021-22673 CVE-2021-22671 Original Bulletin: https://us-cert.cisa.gov/ics/advisories/icsa-21-119-01 - --------------------------BEGIN INCLUDED TEXT-------------------- ICS Advisory (ICSA-21-119-01) Texas Instruments SimpleLink Original release date: April 29, 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 9.8 o ATTENTION: Exploitable remotely/low attack complexity o Vendor: Texas Instruments o Equipment: SimpleLink Wi-Fi, MSP432, CC13XX, CC26XX, CC32XX, CC3100 o Vulnerabilities: Stack-based Buffer Overflow, Integer Overflow or Wraparound 2. RISK EVALUATION Successful exploitation of these vulnerabilities could result in memory corruption, allowing remote code execution and causing a denial-of-service condition. 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS The following Texas Instruments products are affected: o SimpleLink MSP432E4 SDK: v4.20.00.12 and prior o SimpleLink CC32XX SDK: v4.30.00.06 and prior o SimpleLink CC13X0 SDK: versions prior to v4.10.03 o SimpleLink CC13X2 SDK: versions prior to v4.40.00 o SimpleLink CC26XX SDK: versions prior to v4.40.00 o CC3200 SDK: v1.5.0 and prior o CC3100 SDK: v1.3.0 and prior 3.2 VULNERABILITY OVERVIEW 3.2.1 INTEGER OVERFLOW OR WRAPAROUND CWE-190 An integer overflow exists in the APIs of the host MCU while trying to connect to a WIFI network may lead to issues such as a denial-of-service condition or code execution. CVE-2021-22677 has been assigned to this vulnerability. A CVSS v3 base score of 8.4 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:N/UI:N/S:U/ C:H/I:H/A:H ). 3.2.2 STACK-BASED BUFFER OVERFLOW CWE-121 The affected product is vulnerable to stack-based buffer overflow while processing over-the-air firmware updates from the CDN server, which may allow an attacker to remotely execute code. CVE-2021-22673 has been assigned to this vulnerability. A CVSS v3 base score of 7.2 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:L/UI:R/S:U/ C:H/I:H/A:H ). 3.2.3 INTEGER OVERFLOW OR WRAPAROUND CWE-190 The affected product is vulnerable to integer overflow while parsing malformed over-the-air firmware update files, which may allow an attacker to remotely execute code. CVE-2021-22675 has been assigned to this vulnerability. A CVSS v3 base score of 7.2 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:H/UI:N/S:U/ C:H/I:H/A:H ). 3.2.4 INTEGER OVERFLOW OR WRAPAROUND CWE-190 The affected product is vulnerable to an integer overflow while processing HTTP headers, which may allow an attacker to remotely execute code. CVE-2021-22679 has been assigned to this vulnerability. A CVSS v3 base score of 9.8 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/ C:H/I:H/A:H ). 3.2.5 INTEGER OVERFLOW OR WRAPAROUND CWE-190 Multiple integer overflow issues exist while processing long domain names, which may allow an attacker to remotely execute code. CVE-2021-22671 has been assigned to this vulnerability. A CVSS v3 base score of 9.8 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/ C:H/I:H/A:H ). 3.3 BACKGROUND o CRITICAL INFRASTRUCTURE SECTORS: Multiple Sectors o COUNTRIES/AREAS DEPLOYED: Worldwide o COMPANY HEADQUARTERS LOCATION: United States 3.4 RESEARCHER David Atch and Omri Ben Bassat from Microsoft reported these vulnerabilities to CISA. 4. MITIGATIONS Texas Instruments recommends users upgrade to the latest software version . exas Instruments also recommends users only connect to trusted Wi-Fi networks. CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should: o Minimize network exposure for all control system devices and/or systems, and ensure that 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 VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize VPN is only as secure as its connected devices. 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). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBYItsl+NLKJtyKPYoAQiciRAAkIf2RS3F3xRVRoF3mh+OoHsjNzgTLxOS teKGlG1iyGUq2k0mfAcLk0pdvFjm+jSF9wpP67l5pEuAFMtqnyIJLaoynnu/OYyb Qkm7Ke1tiAAAfelngcYaz2ViujoI+M7nQEj9B+Q59573QxKUDvxbOjwNy8LQVzfO eCuvqTEqlDpFNecOf/wl2IiZCNcnwpyGZAalK8ikfc4vPVt3OnIdWVAZQ9qEvAQx 5w002TUpettvV3AjWNe6/cN5PpREusWK08ZFqF2akMJEBdd7I5jmd0DJnelz7XZA h+f+pdy0ru8khFHajTEjK8KjLPeo4Y7TEb9Wy9otDqDvc75lifSeT/suMIoskiKe NFNS8XqVFA4U27QgV4iDadKYyAncyaj7gAECB+1ujUSRMLsZyan1POfRmOfFSf7e TOaRD4Z/cl3Ht6ic/yKgXjskKjPzZv/84cJLDFcukOyFnmw77ttFddx/p1vPIwwO veEFQ+5woy1iu1HBlbOU04J4oRN57R4jK/fZCpFW7BhjnHSDGCvHajP9sj3ec6Ve pZCCEcYKTMPId577hKC9Wxb4mijUje9GnhxEbjZK/qyBKv+1TIs/Uq7GXkG7YMH8 o5WFZ8ddMjRCcIOb2hsYhpaBTJO9mBPFGfK7YebPzQP995sMDOv1UA4YBOVRWsyF lmpegEm8doI= =npwU -----END PGP SIGNATURE-----