27 January 2023
Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2023.0271.2 Advisory (icsa-23-017-02) Mitsubishi Electric MELSEC iQ-F, iQ-R Series 27 January 2023 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Mitsubishi Electric MELSEC iQ-F, iQ-R Series Publisher: ICS-CERT Operating System: Network Appliance Resolution: Patch/Upgrade CVE Names: CVE-2022-40267 Original Bulletin: https://us-cert.cisa.gov/ics/advisories/icsa-23-017-02 Comment: CVSS (Max): 5.9 CVE-2022-40267 (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N) CVSS Source: ICS-CERT Calculator: https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N Revision History: January 27 2023: Vendor Update January 18 2023: Initial Release - --------------------------BEGIN INCLUDED TEXT-------------------- ICS Advisory (ICSA-23-017-02) Mitsubishi Electric MELSEC iQ-F, iQ-R Series (Update A) Original release date: January 26, 2023 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 5.9 o ATTENTION: Exploitable remotely o Vendor: Mitsubishi Electric o Equipment: MELSEC iQ-F and iQ-R Series products o Vulnerability: Predictable Seed in Pseudo-Random Number Generator (PRNG) 2. UPDATE OR REPOSTED INFORMATION This updated advisory is a follow-up to the original advisory titled ICSA-23-017-02 Mitsubishi Electric MELSEC iQ-F, iQ-R Series that was published January 17, 2023, on the ICS webpage on cisa.gov/ICS. 3. RISK EVALUATION Successful exploitation of this vulnerability could allow an attacker to access the WEB server function by guessing the random numbers used for authentication. 4. TECHNICAL DETAILS 4.1 AFFECTED PRODUCTS The following Mitsubishi Electric MELSEC products are affected: o MELSEC iQ-F Series with serial number 17X**** or later: FX5U-xMy/z x=32,64,80, y=T,R, z=ES,DS,ESS,DSS: Versions 1.280 and prior FX5UC-xMy/z x=32,64,96 y=T, z=D,DSS: Versions 1.280 and prior o MELSEC iQ-F Series with serial number 179**** and prior: FX5U-xMy/z x=32,64,80, y=T,R, z=ES,DS,ESS,DSS: Versions 1.074 and prior FX5UC-xMy/z x=32,64,96 y=T, z=D,DSS: Versions 1.074 and prior o MELSEC iQ-F Series FX5UC-32MT/DS-TS, FX5UC-32MT/DSS-TS, FX5UC-32MR/DS-TS: Versions 1.280 and prior - --------- Begin Update A part 1 of 4 --------- o FX5UJ-xMy/z x=24,40,60, y=T,R, z=ES,ESS: Versions 1.042 and prior o FX5UJ-xMy/ES-A* x=24,40,60, y=T,R: Versions 1.043 and prior o FX5S-xMy/z* x=30,40,60,80, y=T,R, z=ES,ESS: Versions 1.003 and prior - --------- End Update A part 1 of 4 --------- o MELSEC iQ-R Series R00/01/02CPU: All versions o MELSEC iQ-R Series R04/08/16/32/120(EN)CPU: All versions - --------- Begin Update A part 2 of 4 --------- Note: These products are available in limited regions. - --------- End Update A part 2 of 4 --------- 4.2 VULNERABILITY OVERVIEW - --------- Begin Update A part 3 of 4 --------- 4.2.1 PREDICTABLE SEED IN PSEUDO-RANDOM NUMBER GENERATOR (PRNG) CWE-337 Mitsubishi Electric MELSEC iQ-F and iQ-R Series products both contain an authentication bypass vulnerability in the WEB server function due to predictable seed in the pseudo-random number generator. CVE-2022-40267 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:N/UI:N/S:U/ C:N/I:H/A:N ). - --------- End Update A part 3 of 4 --------- 4.3 BACKGROUND o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing o COUNTRIES/AREAS DEPLOYED: Worldwide o COMPANY HEADQUARTERS LOCATION: Japan 4.4 RESEARCHER Matt Wiseman of Cisco Talos reported this vulnerability to Mitsubishi Electric. 5. MITIGATIONS Mitsubishi Electric has fixed the following products and recommends users apply the latest firmware update to the follow products: o MELSEC iQ-F Series with serial number 17X**** or later: FX5U-xMy/z x=32,64,80, y=T,R, z=ES,DS,ESS,DSS: Update to v1.281 or later FX5UC-xMy/z x=32,64,96 y=T, z=D,DSS: Update to v1.281 or later o MELSEC iQ-F Series with serial number 179**** and prior: FX5U-xMy/z x=32,64,80, y=T,R, z=ES,DS,ESS,DSS: Update to v1.075 or later FX5UC-xMy/z x=32,64,96 y=T, z=D,DSS: Update to v1.075 or later o MELSEC iQ-F Series FX5UC-32MT/DS-TS, FX5UC-32MT/DSS-TS, FX5UC-32MR/DS-TS: Update to v1.281 or later - --------- Begin Update A part 4 of 4 --------- o FX5UJ-xMy/z x=24,40,60, y=T,R, z=ES,ESS: Update to v1.044 or later o FX5UJ-xMy/ES-A* x=24,40,60, y=T,R: Update to v1.045 or later o FX5S-xMy/z* x=30,40,60,80, y=T,R, z=ES,ESS: Update to v1.004 or later Note: These products are available in limited regions. For how to get the fixed version, users should contact Mitsubishi Electric. - --------- End Update A part 4 of 4 --------- Refer to the following product manual for updating the firmware: "5 FIRMWARE UPDATE FUNCTION" in the MELSEC iQ-F FX5 User's Manual (Application) Mitsubishi Electric recommends users take the following mitigation measures to minimize the risk of exploiting this vulnerability: o Use a firewall or virtual private network (VPN), etc. to prevent unauthorized access when internet access is required. o Use products inside a local area network (LAN) and block access from untrusted networks and hosts through firewalls. o Use the IP filter function* to block access from untrusted hosts. For details on the IP filter function, refer to the manuals for each product: "12.1 IP Filter Function" in the MELSEC iQ-F FX5 User's Manual (Ethernet Communication) "1.13 Security" - "IP filter" in the MELSEC iQ-R Ethernet User's Manual (Application) 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 at cisa.gov/ics . Several CISA products detailing cyber defense best 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 at cisa.gov/ics in the technical information paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies . Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents. No known public exploits specifically target this vulnerability. This vulnerability has a high attack complexity. 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. 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On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: https://auscert.org.au/gpg-key/ iQIVAwUBY9NV08kNZI30y1K9AQgjZA/+MZeME8Iwp1U6S03umwv+9+e6sEOuz104 EIF0rmYUqW5n+DK9+fC1yYk758VwtRWX1HFnjdBXXFEsWfFjaZSIC1fxZShoSYOD 9MnPqsn+iMjpXdB0TyxfZb3uaZ+q2GiG/2AK1TDbpnddmMmZkNrhwTKZM/ssR996 m2Ejcw5kxZCaTyNwknJW4JnXySEKdO7/WomyslUlY74SkwqNN88c37Xjw/YMusn7 6k6q7RRg5X8BHcBwLyLdImZGjSylQnbVHbQ63Dw8d+qOhwil+LSMPHZR4EvaaHtO GgrxKkZg8RY/n1DO3LC+xpN9PKzi5M0k93WR6MMd0ZAXP9+xo9Q6blRbi4tuhfv/ 9l6GvMIRrj27RiRgKziNtc/oJ4O1/D3L+1ymXV/sWk7Rko7z+Zqa/HLQ+E5l+kqV ig1e3tnjWR+Y4aDANF+8epDDCYRQHmxzi1A7qRnDl980BUvb6BetO4N25WTE0fr2 GtfGhvMrVi/kwed+TtDQzrtRBG8TPPM3phZwQfS1ottGqNS3LZHYQHY/xallUp5B P5jAd0QxG5rU+Wnqrepf7LkYL0a7tl8fGykIR4Hzd0fMI/IoY11bqh0l6XbUSbV7 YgUnmvdPYz6/mm1vfoeyABCCDVraOm8Rwh3iOAhXnGkCFdnFQ7duzrimkxEXNpq8 X7+u2YBGhoc= =IR4j -----END PGP SIGNATURE-----