CVE-2019-16338 : Security Advisory and Response

An exploitable use-after-free vulnerability can occur when a specially crafted .docx file is processed by the tfo_common component within the HwordApp.dll module of Hancom Office 9.6.1.7634.

Understanding CVE-2019-16338

The tfo_common component in HwordApp.dll in Hancom Office 9.6.1.7634 allows a use-after-free via a crafted .docx file.

What is CVE-2019-16338?

The vulnerability in Hancom Office 9.6.1.7634 can lead to a use-after-free condition when processing a malicious .docx file, potentially allowing an attacker to execute arbitrary code.

The Impact of CVE-2019-16338

This vulnerability could be exploited by an attacker to execute arbitrary code on a targeted system, leading to potential unauthorized access, data theft, or system compromise.

Technical Details of CVE-2019-16338

Vulnerability Description

The use-after-free vulnerability arises in the tfo_common component within the HwordApp.dll module of Hancom Office 9.6.1.7634 when handling specially crafted .docx files.

Affected Systems and Versions

Affected System: Hancom Office 9.6.1.7634
Affected Component: HwordApp.dll
Affected Version: 9.6.1.7634

Exploitation Mechanism

The vulnerability can be exploited by enticing a user to open a malicious .docx file, triggering the use-after-free condition and potentially allowing the attacker to execute arbitrary code.

Mitigation and Prevention

Immediate Steps to Take

Avoid opening unsolicited or suspicious .docx files from untrusted sources.
Implement security best practices for email and file attachments.
Consider using alternative office suites until a patch is available.

Long-Term Security Practices

Regularly update and patch software to mitigate known vulnerabilities.
Educate users on recognizing and avoiding social engineering tactics used in phishing attacks.

Patching and Updates

Monitor official sources for security updates and patches from Hancom for Hancom Office 9.6.1.7634.