CVE-2023-38744 : Exploit Details and Defense Strategies

A denial-of-service (DoS) vulnerability has been discovered in certain products from OMRON Corporation, potentially leading to a DoS condition when receiving a specially crafted packet from a remote unauthenticated attacker.

Understanding CVE-2023-38744

This section delves into the intricacies of CVE-2023-38744, shedding light on the affected products and versions, as well as the implications of the vulnerability.

What is CVE-2023-38744?

The CVE-2023-38744 vulnerability involves an improper validation of a certain type of input issue 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.

The Impact of CVE-2023-38744

An attacker could exploit this vulnerability by sending a specifically crafted packet to the affected product, causing it to experience a denial-of-service (DoS) condition. This could disrupt normal operations and potentially lead to downtime.

Technical Details of CVE-2023-38744

Providing detailed insights into the vulnerability, affected systems, and potential exploitation methods.

Vulnerability Description

The vulnerability stems from improper validation of a certain type of input, affecting the built-in EtherNet/IP port of the CJ2 CPU unit and the communication function of the CS/CJ Series EtherNet/IP unit.

Affected Systems and Versions

The following products and versions are impacted:

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
CS/CJ Series EtherNet/IP Unit: CJ1W-EIP21 V3.04 and earlier

Exploitation Mechanism

An attacker can exploit this vulnerability by crafting a malicious packet and transmitting it to the vulnerable product, causing it to enter a DoS state.

Mitigation and Prevention

Understanding the steps needed to mitigate the risk and prevent potential exploitation of CVE-2023-38744.

Immediate Steps to Take

Apply patches provided by OMRON Corporation promptly.
Implement network segmentation to limit exposure.

Long-Term Security Practices

Keep systems and software updated to prevent vulnerabilities.
Conduct regular security assessments and audits.

Patching and Updates

Stay informed about security updates and patches released by the vendor to address CVE-2023-38744.