Mitsubishi Electric MELSEC iQ-R Series Uncontrolled Resource Consumption (CVE-2020-13238)

high Tenable OT Security Plugin ID 500487

Synopsis

The remote OT asset is affected by a vulnerability.

Description

Mitsubishi MELSEC iQ-R Series PLCs with firmware 33 allow attackers to halt the industrial process by sending an unauthenticated crafted packet over the network, because this denial of service attack consumes excessive CPU time.
After halting, physical access to the PLC is required in order to restore production.

This plugin only works with Tenable.ot. Please visit https://www.tenable.com/products/tenable-ot for more information.

Solution

The following text was originally created by the Cybersecurity and Infrastructure Security Agency (CISA). The original can be found at CISA.gov.

Mitsubishi Electric has fixed the following versions to discard packets when specially crafted packets are received:

- R00/01/02CPU: Firmware Versions 8 or later
- R04/08/16/32/120CPU, R04/08/16/32/120ENCPU: Firmware Versions 40 or later
- R08/16/32/120SFCPU: Firmware Versions 21 or later
- R08/16/32/120PCPU: Firmware Versions 25 or later
- R08/16/32/120PSFCPU: Firmware Versions 06 or later
- RJ71EN71: Firmware Versions 50 or later

Mitsubishi Electric recommends users of the affected devices take the following measures for cyber-attacks such as DoS attack or unauthorized access from untrusted networks or hosts.

- Connection to untrusted networks or hosts: Check whether the modules mounted in the equipment used are connected to untrusted networks or hosts.
- Firewalls: If the modules are connected to untrusted networks or hosts, check whether measures such as firewalls are properly configured.

Please see the publication from Mitsubishi Electric for more information.

Plugin Details

Severity: High

ID: 500487

Version: 1.9

Type: remote

Family: Tenable.ot

Published: 2/7/2022

Updated: 9/4/2024

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C

CVSS Score Source: CVE-2020-13238

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:mitsubishielectric:melsec_iq-r02cpu_firmware, cpe:/o:mitsubishielectric:melsec_iq-r08cpu_firmware, cpe:/o:mitsubishielectric:melsec_iq-r16pcpu_firmware, cpe:/o:mitsubishielectric:melsec_iq-r00cpu_firmware, cpe:/o:mitsubishielectric:melsec_iq-r08pcpu_firmware, cpe:/o:mitsubishielectric:melsec_iq-rj71en71_firmware, cpe:/o:mitsubishielectric:melsec_iq-r32fcpu_firmware, cpe:/o:mitsubishielectric:melsec_iq-r16sfcpu_firmware, cpe:/o:mitsubishielectric:melsec_iq-r08sfcpu_firmware, cpe:/o:mitsubishielectric:melsec_iq-r04cpu_firmware, cpe:/o:mitsubishielectric:melsec_iq-r16cpu_firmware, cpe:/o:mitsubishielectric:melsec_iq-r120pcpu_firmware, cpe:/o:mitsubishielectric:melsec_iq-r16fcpu_firmware, cpe:/o:mitsubishielectric:melsec_iq-r120fcpu_firmware, cpe:/o:mitsubishielectric:melsec_iq-r32sfcpu_firmware, cpe:/o:mitsubishielectric:melsec_iq-r32cpu_firmware, cpe:/o:mitsubishielectric:melsec_iq-r32pcpu_firmware, cpe:/o:mitsubishielectric:melsec_iq-r01cpu_firmware, cpe:/o:mitsubishielectric:melsec_iq-r08fcpu_firmware, cpe:/o:mitsubishielectric:melsec_iq-r120sfcpu_firmware, cpe:/o:mitsubishielectric:melsec_iq-r120cpu_firmware

Required KB Items: Tenable.ot/Mitsubishi

Exploit Ease: No known exploits are available

Patch Publication Date: 6/10/2020

Vulnerability Publication Date: 6/10/2020

Reference Information

CVE: CVE-2020-13238

CWE: 400

ICSA: 20-161-02

Detections

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