Omron CS/CJ Series Denial of Service (CVE-2023-38744)

high Tenable OT Security Plugin ID 501603

Synopsis

The remote OT asset is affected by a vulnerability.

Description

Denial-of-service (DoS) vulnerability due to improper validation of specified type of input issue exists in the built-in EtherNet/IP port of the CJ Series CJ2 CPU unit and the communication function of the CS/CJ Series EtherNet/IP unit. If an affected product receives a packet which is specially crafted by a remote unauthenticated attacker, the unit of the affected product may fall into a denial-of- service (DoS) condition. Affected products/versions are as follows:
CJ2M CPU Unit CJ2M-CPU3[] Unit version of the built-in EtherNet/IP section Ver. 2.18 and earlier, CJ2H CPU Unit CJ2H-CPU6[]-EIP Unit version of the built-in EtherNet/IP section Ver. 3.04 and earlier, CS/CJ Series EtherNet/IP Unit CS1W-EIP21 V3.04 and earlier, and CS/CJ Series EtherNet/IP Unit CJ1W-EIP21 V3.04 and earlier.

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

Solution

Refer to the vendor advisory.

Plugin Details

Severity: High

ID: 501603

Version: 1.2

Type: remote

Family: Tenable.ot

Published: 8/11/2023

Updated: 9/6/2023

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-2023-38744

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:omron:cj2m-cpu34_firmware, cpe:/o:omron:cj2m-cpu35_firmware, cpe:/o:omron:cj2h-cpu65-eip_firmware, cpe:/o:omron:cs1w-eip21_firmware, cpe:/o:omron:cj1w-eip21_firmware, cpe:/o:omron:cj2h-cpu64-eip_firmware, cpe:/o:omron:cj2h-cpu67-eip_firmware, cpe:/o:omron:cj2h-cpu68-eip_firmware, cpe:/o:omron:cj2m-cpu33_firmware, cpe:/o:omron:cj2m-cpu31_firmware, cpe:/o:omron:cj2h-cpu66-eip_firmware, cpe:/o:omron:cj2m-cpu32_firmware

Required KB Items: Tenable.ot/Omron

Exploit Ease: No known exploits are available

Patch Publication Date: 8/3/2023

Vulnerability Publication Date: 8/3/2023

Reference Information

CVE: CVE-2023-38744

Detections

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