Mitsubishi Electric GOT and Tension Controller


基本信息

时间: 2021-10-05

风险等级: 未知

ICSA: ICS Advisory (ICSA-21-278-01)

厂商: Mitsubishi Electric

原地址: https://us-cert.cisa.gov/ics/advisories/icsa-21-278-01


1. EXECUTIVE SUMMARY

  • CVSS v3 7.5
  • ATTENTION: Exploitable remotely/low attack complexity
  • Vendor: Mitsubishi Electric
  • Equipment: GOT and Tension Controller
  • Vulnerabilities: Improper Handling of Exceptional Conditions, Improper Input Validation

2. RISK EVALUATION

Successful exploitation of these vulnerabilities could allow an attacker to cause a denial-of-service condition by sending specially crafted packets.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following Mitsubishi Electric products are affected:

  • GOT2000 Series GT21 Model
    • GT2107-WTBD: All versions
    • GT2107-WTSD: All versions
    • GT2104-RTBD: All versions
    • GT2104-PMBD: All versions
    • GT2103-PMBD: All versions
  • GOT SIMPLE Series GS21 Model
    • GS2110-WTBD: All versions
    • GS2107-WTBD: All versions
    • GS2110-WTBD-N: All versions
    • GS2107-WTBD-N: All versions
  • Tension Controller
    • LE7-40GU-L: All versions

3.2 VULNERABILITY OVERVIEW

3.2.1    IMPROPER HANDLING OF EXCEPTIONAL CONDITIONS CWE-755

An attacker could send specially crafted packets cause to cause several different denial-of-service conditions due to the improper handling of exceptional conditions.

CVE-2021-20602 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

3.2.2    IMPROPER INPUT VALIDATION CWE-20

An attacker could send specially crafted packets cause to cause several different denial-of-service conditions in the TCP-IP protocol stack of GOT and Tension Controller.

CVE-2021-20603 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

3.2.3    IMPROPER INPUT VALIDATION CWE-20

An attacker could send specially crafted packets cause to cause several different denial-of-service conditions in the TCP-IP protocol stack of GOT and Tension Controller.

CVE-2021-20604 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

3.2.4    IMPROPER INPUT VALIDATION CWE-20

An attacker could send specially crafted packets cause to cause several different denial-of-service conditions in the TCP-IP protocol stack of GOT and Tension Controller.

CVE-2021-20605 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

3.3 BACKGROUND

  • CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
  • COUNTRIES/AREAS DEPLOYED: Worldwide
  • COMPANY HEADQUARTERS LOCATION: Japan

3.4 RESEARCHER

Mitsubishi Electric reported these vulnerabilities to CISA.

4. MITIGATIONS

Mitsubishi Electric plans to release updated, fixed versions of these products in the future. 

Mitsubishi Electric recommends users take the following mitigation measures to minimize the risk of exploiting these vulnerabilities:

  • Use a firewall or virtual private network (VPN), etc. to prevent unauthorized access when Internet access is required.
  • Use within a LAN and block access from untrusted networks and host through firewalls.
  • Use the IP filter function to restrict the accessible IP addresses. Please see the following manuals about IP filter function:
    • GT Designer3 (GOT2000) Screen Design Manual (SH-081220ENG) “5.4.3 Setting the IP filter”
    • GOT support for the IP filter function (Tension Controller does not support it)

For additional questions, please refer to the Mitsubishi Electric support website.

For specific update instructions and additional details see the Mitsubishi Electric advisory.

CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should:

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.