CVE-2022-39019 : Exploit Details and Defense Strategies

This article provides detailed information about CVE-2022-39019, a vulnerability affecting M-Files Hubshare due to broken access controls on PDFtron WebviewerUI.

Understanding CVE-2022-39019

CVE-2022-39019 is a security vulnerability that allows unauthenticated attackers to upload malicious files to the application server through broken access controls on PDFtron WebviewerUI in M-Files Hubshare.

What is CVE-2022-39019?

The vulnerability in M-Files Hubshare before version 3.3.11.3 enables attackers to bypass access controls and compromise the application server by uploading malicious files.

The Impact of CVE-2022-39019

The impact of this vulnerability, categorized under CAPEC-17: Using Malicious Files, is rated as medium severity with a CVSS base score of 6.3. Attackers can exploit this flaw to achieve unauthorized file uploads.

Technical Details of CVE-2022-39019

CVE-2022-39019 is described by the CVSS V3.1 metric with an attack complexity of low, network-based attack vector, and no privileges required. Successful exploitation requires user interaction.

Vulnerability Description

The vulnerability is due to improper access controls on PDFtron WebviewerUI, leading to unauthenticated file uploads by attackers without the need for any special user privileges.

Affected Systems and Versions

M-Files Hubshare versions prior to 3.3.11.3 are affected by this vulnerability, exposing them to the risk of unauthorized file uploads.

Exploitation Mechanism

Attackers can leverage the broken access controls to upload malicious files to the M-Files Hubshare application server without proper authentication, potentially leading to further system compromise.

Mitigation and Prevention

To mitigate the risk associated with CVE-2022-39019, immediate steps need to be taken to secure the affected systems and prevent unauthorized file uploads.

Immediate Steps to Take

Organizations should update M-Files Hubshare to version 3.3.11.3 or later to address the vulnerability and prevent unauthenticated file uploads.

Long-Term Security Practices

Implement proper access controls, authentication mechanisms, and file upload validations to enhance the security posture of the application server and prevent similar vulnerabilities.

Patching and Updates

Regularly monitor security advisories and apply patches released by the vendor to ensure the ongoing security of the M-Files Hubshare application server.