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CVE-2019-9852 : Vulnerability Insights and Analysis

Learn about CVE-2019-9852, a vulnerability in LibreOffice versions prior to 6.2.6 allowing bypassing of protection through a URL encoding attack. Find mitigation steps and prevention measures here.

LibreOffice offers a functionality that allows users to specify the execution of pre-installed macros on different script events like mouse-over or document-open. A vulnerability in versions older than 6.2.6 allows bypassing of a protection mechanism through a URL encoding attack.

Understanding CVE-2019-9852

This CVE identifies an insufficient URL encoding flaw in the allowed script location check in LibreOffice.

What is CVE-2019-9852?

CVE-2019-9852 is a vulnerability in LibreOffice versions prior to 6.2.6 that could be exploited to bypass a protection mechanism using a URL encoding attack.

The Impact of CVE-2019-9852

The vulnerability could allow an attacker to execute scripts in arbitrary locations on the file system, compromising the security of the system.

Technical Details of CVE-2019-9852

This section provides detailed technical information about the vulnerability.

Vulnerability Description

LibreOffice's protection against directory traversal attacks (CVE-2018-16858) could be bypassed using a URL encoding attack in versions older than 6.2.6.

Affected Systems and Versions

        Product: LibreOffice
        Vendor: Document Foundation
        Versions Affected: < 6.2.6

Exploitation Mechanism

The vulnerability allows attackers to execute scripts from unauthorized locations on the file system by exploiting the insufficient URL encoding in the script location check.

Mitigation and Prevention

Protect your systems from CVE-2019-9852 with the following steps:

Immediate Steps to Take

        Update LibreOffice to version 6.2.6 or newer to mitigate the vulnerability.
        Avoid executing macros from untrusted sources.

Long-Term Security Practices

        Regularly update software to the latest versions to patch known vulnerabilities.
        Educate users on safe macro execution practices to prevent potential exploits.

Patching and Updates

Ensure timely installation of security updates and patches provided by LibreOffice to address CVE-2019-9852.

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