CVE-2023-33920 : What You Need to Know

A vulnerability has been identified in Siemens CP-8031 MASTER MODULE and CP-8050 MASTER MODULE devices that could allow an attacker to exploit hard-coded credentials for UART console login.

Understanding CVE-2023-33920

This CVE relates to a security flaw in certain Siemens devices that could enable unauthorized access to the device through hard-coded password hash.

What is CVE-2023-33920?

CVE-2023-33920 is a vulnerability in Siemens CP-8031 MASTER MODULE and CP-8050 MASTER MODULE devices where the root password hash is hardcoded, potentially allowing attackers with physical access to gain unauthorized entry.

The Impact of CVE-2023-33920

This vulnerability poses a medium-level threat, with a CVSS base score of 6.8. An attacker with physical proximity to the affected device could exploit the hardcoded credentials to gain unauthorized access, compromising system integrity and confidentiality.

Technical Details of CVE-2023-33920

This section outlines the specifics of the vulnerability.

Vulnerability Description

The affected Siemens devices store the root password hash in a hard-coded form, making it accessible to attackers who have direct physical access. This could result in unauthorized login via the UART console.

Affected Systems and Versions

Siemens CP-8031 MASTER MODULE and CP-8050 MASTER MODULE devices with versions below CPCI85 V05 are impacted by this vulnerability.

Exploitation Mechanism

Attackers can exploit the hardcoded root password hash by leveraging direct physical access to the affected devices, enabling them to log in through the UART console.

Mitigation and Prevention

Protecting against CVE-2023-33920 requires immediate action and long-term security measures.

Immediate Steps to Take

Siemens advises users to apply the necessary patches provided by the company to mitigate the vulnerability.
Consider restricting physical access to the affected devices to prevent unauthorized manipulation.

Long-Term Security Practices

Regularly update firmware and software to address security vulnerabilities.
Implement strong password policies and avoid the use of default or hard-coded credentials.

Patching and Updates

Siemens has released security advisories and patches to address CVE-2023-33920. Users are encouraged to promptly install these updates to safeguard their devices against potential exploits.