CVE-2023-26593 : Security Advisory and Response

This CVE record outlines a security vulnerability identified as CVE-2023-26593 affecting the CENTUM series provided by Yokogawa Electric Corporation. The vulnerability involves the cleartext storage of sensitive information, potentially leading to escalated user privileges and unauthorized control system operation.

Understanding CVE-2023-26593

This section delves deeper into the specifics of CVE-2023-26593, shedding light on the nature and implications of this security issue.

What is CVE-2023-26593?

CVE-2023-26593 refers to a vulnerability in the CENTUM series offered by Yokogawa Electric Corporation. It involves the cleartext storage of sensitive information, which could be exploited by an attacker with access to escalate user privileges within the system.

The Impact of CVE-2023-26593

The impact of this vulnerability is significant as it allows an attacker, who has obtained user credentials, to potentially elevate their privileges within the affected product. This could lead to unauthorized access and control over the CENTUM managed system, posing a serious risk to the integrity and security of the control system.

Technical Details of CVE-2023-26593

In this section, we will explore the technical aspects of CVE-2023-26593, including the vulnerability description, affected systems and versions, as well as the exploitation mechanism.

Vulnerability Description

The vulnerability involves the cleartext storage of sensitive information within the password file stored on the computer where the affected product is installed. By tampering with this file, an attacker could escalate user privileges within the CENTUM system, potentially compromising the control operations.

Affected Systems and Versions

The following systems and versions are known to be affected by CVE-2023-26593:

CENTUM CS 1000
CENTUM CS 3000 (Including CENTUM CS 3000 Entry Class) R2.01.00 to R3.09.50
CENTUM VP (Including CENTUM VP Entry Class) R4.01.00 to R4.03.00, R5.01.00 to R5.04.20, and R6.01.00 and later
B/M9000 CS R5.04.01 to R5.05.01
B/M9000 VP R6.01.01 to R7.04.51 and R8.01.01 and later

Exploitation Mechanism

To exploit this vulnerability, an attacker must have obtained user credentials within the affected product's environment and leverage the CENTUM Authentication Mode for user authentication when CENTUM VP is utilized.

Mitigation and Prevention

Mitigating the risks associated with CVE-2023-26593 requires immediate action and a long-term security strategy to safeguard against potential threats.

Immediate Steps to Take

Regularly monitor and audit user credentials and access within the CENTUM system.
Implement strong password policies and encryption methods to protect sensitive information.
Restrict access to critical systems and segments to authorized personnel only.

Long-Term Security Practices

Conduct regular security assessments and penetration testing to identify and address vulnerabilities proactively.
Educate employees on cybersecurity best practices and the importance of safeguarding sensitive information.
Stay updated on security advisories and patches released by Yokogawa Electric Corporation.

Patching and Updates

Stay informed about security updates and patches released by Yokogawa Electric Corporation for the affected products and versions. Promptly apply patches to close security gaps and enhance system resilience against potential attacks.