Mitsubishi Electric MELSEC iQ-R Null Pointer Dereference (CVE-2020-5655)

high Tenable OT Security Plugin ID 500554

Synopsis

The remote OT asset is affected by a vulnerability.

Description

NULL pointer dereferences vulnerability in TCP/IP function included in the firmware of MELSEC iQ-R series (RJ71EIP91 EtherNet/IP Network Interface Module First 2 digits of serial number are '02' or before, RJ71PN92 PROFINET IO Controller Module First 2 digits of serial number are '01' or before, RD81DL96 High Speed Data Logger Module First 2 digits of serial number are '08' or before, RD81MES96N MES Interface Module First 2 digits of serial number are '04' or before, and RD81OPC96 OPC UA Server Module First 2 digits of serial number are '04' or before) allows a remote unauthenticated attacker to stop the network functions of the products via a specially crafted packet.

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

- Block access from untrusted networks and hosts through firewalls.

Please refer to Mitsubishi Electric’s website for details on available patches. Mitsubishi recommends users update their products by downloading and applying the latest versions. Please contact a Mitsubishi Electric representative for additional details.

Plugin Details

Severity: High

ID: 500554

Version: 1.10

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: Medium

Base Score: 5

Temporal Score: 3.7

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

CVSS Score Source: CVE-2020-5655

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-rj71pn92_firmware:-, cpe:/o:mitsubishielectric:melsec_iq-rd81dl96_firmware:-, cpe:/o:mitsubishielectric:melsec_iq-rd81opc96_firmware:-, cpe:/o:mitsubishielectric:melsec_iq-rj71eip91_firmware:-, cpe:/o:mitsubishielectric:melsec_iq-rd81mes96n_firmware:-

Required KB Items: Tenable.ot/Mitsubishi

Exploit Ease: No known exploits are available

Patch Publication Date: 11/2/2020

Vulnerability Publication Date: 11/2/2020

Reference Information

CVE: CVE-2020-5655

CWE: 476

ICSA: 20-303-02

Detections

Analytics