CVE-2023-42796 Explained : Impact and Mitigation

A vulnerability has been identified in Siemens CP-8031 MASTER MODULE and CP-8050 MASTER MODULE that could allow an authenticated remote attacker to traverse directories on the system and download arbitrary files, potentially leading to privilege escalation.

Understanding CVE-2023-42796

This section will cover what CVE-2023-42796 is, its impact, technical details, mitigation, and prevention strategies.

What is CVE-2023-42796?

CVE-2023-42796 is a vulnerability found in Siemens CP-8031 MASTER MODULE and CP-8050 MASTER MODULE where the web server fails to properly sanitize user input, allowing for directory traversal and file download by an authenticated remote attacker.

The Impact of CVE-2023-42796

The impact of this vulnerability is high, with the potential for an attacker to access sensitive files on the system and escalate privileges to the administrator role, posing a significant security risk.

Technical Details of CVE-2023-42796

Let's delve into the technical aspects of CVE-2023-42796 including the vulnerability description, affected systems and versions, and exploitation mechanism.

Vulnerability Description

The vulnerability arises from improper limitation of a pathname to a restricted directory ('Path Traversal'), enabling attackers to move through directories and access unauthorized files.

Affected Systems and Versions

Siemens CP-8031 MASTER MODULE and CP-8050 MASTER MODULE are affected by this vulnerability, specifically versions less than CPCI85 V05.11.

Exploitation Mechanism

Attackers can exploit this vulnerability through the /sicweb-ajax/tmproot/ endpoint, using active session IDs to gain access to directories and download files.

Mitigation and Prevention

Discover the necessary steps to mitigate the risks associated with CVE-2023-42796 and safeguard your systems against potential threats.

Immediate Steps to Take

It is recommended to apply security patches provided by Siemens promptly to address the vulnerability and enhance the security of CP-8031 MASTER MODULE and CP-8050 MASTER MODULE.

Long-Term Security Practices

Implement strict input validation mechanisms, access controls, and regular security assessments to prevent similar vulnerabilities in the future and ensure comprehensive security.

Patching and Updates

Stay informed about security updates from Siemens and regularly update your devices to the latest secure versions to protect against known vulnerabilities and unauthorized access.