CVE-2023-34939 : Exploit Details and Defense Strategies

A critical remote code execution (RCE) vulnerability in Onlyoffice Community Server before v12.5.2 has been discovered, allowing attackers to execute arbitrary code via the component UploadProgress.ashx.

Understanding CVE-2023-34939

This section delves into the details of the CVE-2023-34939 vulnerability.

What is CVE-2023-34939?

The CVE-2023-34939 vulnerability is an RCE flaw in Onlyoffice Community Server that enables threat actors to remotely execute malicious code through the UploadProgress.ashx component.

The Impact of CVE-2023-34939

The impact of CVE-2023-34939 includes the potential for threat actors to gain unauthorized access to systems, execute arbitrary commands, and compromise sensitive data.

Technical Details of CVE-2023-34939

Here we discuss the technical aspects of the CVE-2023-34939 vulnerability.

Vulnerability Description

The RCE vulnerability in Onlyoffice Community Server before v12.5.2 allows remote attackers to execute arbitrary code by exploiting the UploadProgress.ashx component.

Affected Systems and Versions

All versions of Onlyoffice Community Server before v12.5.2 are affected by this vulnerability.

Exploitation Mechanism

Attackers can exploit CVE-2023-34939 by sending specially crafted requests to the UploadProgress.ashx component, leading to the execution of malicious code.

Mitigation and Prevention

In this section, we cover the steps to mitigate and prevent exploitation of CVE-2023-34939.

Immediate Steps to Take

Immediately update Onlyoffice Community Server to version 12.5.2 or newer to patch the RCE vulnerability and prevent exploitation.

Long-Term Security Practices

Implement strict input validation, network segmentation, and access controls to enhance overall system security and prevent future vulnerabilities.

Patching and Updates

Regularly monitor for security updates and patches for Onlyoffice Community Server to address any potential vulnerabilities and ensure the ongoing security of the system.