CVE-2019-25644: WinMPG Video Convert DoS Vulnerability

CVE-2019-25644 Overview

CVE-2019-25644 is a buffer overflow vulnerability (CWE-787: Out-of-bounds Write) affecting WinMPG Video Convert version 9.3.5 and older. The vulnerability exists in the registration dialog of the application, where improper boundary checking allows local attackers to supply oversized input that triggers a denial of service condition by crashing the application.

Critical Impact

Local attackers can crash WinMPG Video Convert by pasting approximately 6000 bytes of data into the Name and Registration Code fields, causing application instability and denial of service.

Affected Products

• WinMPG Video Convert 9.3.5
• WinMPG Video Convert versions prior to 9.3.5

Discovery Timeline

• 2026-03-24 - CVE-2019-25644 published to NVD
• 2026-03-24 - Last updated in NVD database

Technical Details for CVE-2019-25644

Vulnerability Analysis

This buffer overflow vulnerability stems from inadequate input validation in the registration dialog component of WinMPG Video Convert. When a user interacts with the software registration interface, the application fails to properly validate the length of input supplied to the Name and Registration Code fields. The vulnerability is classified as CWE-787 (Out-of-bounds Write), indicating that the application writes data past the end of the intended buffer.

The local attack vector requires an attacker to have access to the system where WinMPG Video Convert is installed. While the vulnerability does not allow for code execution or information disclosure based on available information, it effectively enables denial of service through application crashes.

Root Cause

The root cause of this vulnerability is insufficient bounds checking in the registration dialog input handling routines. The application allocates a fixed-size buffer for storing user input in the Name and Registration Code fields but does not enforce proper length limits before copying user-supplied data into these buffers. When input exceeding the buffer capacity (approximately 6000 bytes) is provided, it overwrites adjacent memory, corrupting the application state and leading to a crash.

Attack Vector

The attack requires local access to a system running WinMPG Video Convert. An attacker must:

1. Launch the WinMPG Video Convert application
2. Navigate to the registration dialog
3. Paste a payload of approximately 6000 bytes into the Name or Registration Code field
4. Trigger the buffer overflow, causing the application to crash

This is a local denial of service attack that affects application availability. The attack does not require user interaction beyond accessing the registration dialog, and no special privileges are needed to exploit the vulnerability.

For detailed technical information about this vulnerability, refer to the Exploit-DB #46553 entry and the VulnCheck Advisory.

Detection Methods for CVE-2019-25644

Indicators of Compromise

• Unexpected crashes of the WinMPG Video Convert application, particularly during registration attempts
• Application crash logs showing memory access violations or buffer overrun errors in the registration dialog module
• Abnormally large clipboard contents being pasted into application input fields

Detection Strategies

• Monitor for application crash events associated with WinMPG Video Convert processes
• Implement endpoint detection rules that flag repeated application failures or crash patterns
• Review system event logs for application fault errors related to WinMPG Video Convert

Monitoring Recommendations

• Enable application crash monitoring through Windows Error Reporting or equivalent endpoint monitoring solutions
• Configure SentinelOne agents to detect and alert on suspicious application behavior patterns
• Maintain an inventory of systems with WinMPG Video Convert installed to assess exposure

How to Mitigate CVE-2019-25644

Immediate Actions Required

• Identify all systems with WinMPG Video Convert 9.3.5 or older versions installed
• Consider removing or replacing the software if it is no longer actively maintained or required
• Restrict access to the application to authorized users only
• Evaluate alternative video conversion software with active security support

Patch Information

No vendor patch information is currently available for this vulnerability. The WinMPG Website and WinMPG VideoConvert Download page should be monitored for any security updates.

Workarounds

• Limit local access to systems where WinMPG Video Convert is installed
• Avoid using the registration dialog functionality if possible
• Consider application sandboxing to contain potential impact
• Remove the software if it is not essential to business operations

# Identify WinMPG Video Convert installations on Windows systems
# Run in PowerShell to check for installed software
Get-WmiObject -Class Win32_Product | Where-Object { $_.Name -like "*WinMPG*" }