CVE-2021-25631 Explained : Impact and Mitigation

A detailed overview of CVE-2021-25631, a vulnerability in LibreOffice versions prior to 7.1.2 and 7.0.5 on Windows platforms.

Understanding CVE-2021-25631

This CVE involves a vulnerability in the denylist of executable filename extensions in specific LibreOffice versions on Windows.

What is CVE-2021-25631?

In LibreOffice versions prior to 7.1.2 and 7.0.5 on Windows, the denylist can be bypassed, enabling the launching of an executable by manipulating a link.

The Impact of CVE-2021-25631

Exploitation of this vulnerability could lead to unauthorized execution of malicious executables, posing a serious security risk to affected systems.

Technical Details of CVE-2021-25631

This section covers key technical aspects of CVE-2021-25631.

Vulnerability Description

The vulnerability allows the circumvention of the denylist, resulting in the attempted launch of an executable type through ShellExecute.

Affected Systems and Versions

LibreOffice versions prior to 7.1.2 in the 7-1 series and versions prior to 7.0.5 in the 7-0 series on Windows platforms are affected.

Exploitation Mechanism

By modifying a link in a way that does not match the denylist, attackers can trigger ShellExecute to launch an executable.

Mitigation and Prevention

Learn how to mitigate and prevent the CVE-2021-25631 vulnerability.

Immediate Steps to Take

Users should update LibreOffice to versions 7.1.2 or 7.0.5 to prevent exploitation of this vulnerability.

Long-Term Security Practices

Implement secure coding practices, regularly update software, and educate users on safe browsing habits to enhance overall system security.

Patching and Updates

Stay informed about security advisories from LibreOffice and promptly apply patches to ensure protection against known vulnerabilities.