CVE-2019-25665: River Past Ringtone Converter DoS Flaw

CVE-2019-25665 Overview

River Past Ringtone Converter version 2.7.6.1601 contains a local buffer overflow vulnerability (CWE-787: Out-of-bounds Write) that allows attackers to crash the application by supplying oversized input to activation fields. This denial of service condition can be triggered by pasting 300 bytes of data into the Email textbox and Activation code textarea via the Help menu's Activate dialog.

Critical Impact

Attackers with local access can crash the River Past Ringtone Converter application by exploiting the buffer overflow in the activation dialog, resulting in a denial of service condition.

Affected Products

• River Past Ringtone Converter 2.7.6.1601

Discovery Timeline

• 2026-04-05 - CVE CVE-2019-25665 published to NVD
• 2026-04-07 - Last updated in NVD database

Technical Details for CVE-2019-25665

Vulnerability Analysis

This vulnerability represents a classic buffer overflow condition where user-supplied input exceeds the allocated buffer size, causing memory corruption and application instability. The flaw exists in the activation dialog's input handling mechanism, specifically in the Email textbox and Activation code textarea fields accessed through the Help menu.

When an attacker supplies approximately 300 bytes or more of data to these input fields, the application fails to properly validate the input length before copying it to a fixed-size buffer. This results in adjacent memory being overwritten, leading to application crash. The vulnerability is classified as CWE-787 (Out-of-bounds Write), indicating that the application writes data beyond the boundaries of intended buffers.

Root Cause

The root cause of this vulnerability is improper input validation in the activation dialog component. The application allocates fixed-size buffers for the Email and Activation code fields but fails to implement proper bounds checking before copying user input. When input exceeds the expected length (approximately 300 bytes), the write operation continues past the buffer boundary, corrupting adjacent memory structures and triggering an application crash.

Attack Vector

The attack vector is local, requiring the attacker to have direct access to the system running River Past Ringtone Converter. The exploitation path involves:

1. Opening River Past Ringtone Converter 2.7.6.1601
2. Navigating to Help menu → Activate dialog
3. Pasting 300+ bytes of arbitrary data into either the Email textbox or Activation code textarea
4. The application crashes due to buffer overflow

The vulnerability requires no authentication and no user interaction beyond the attacker's own actions. Technical details and proof-of-concept information are available in the Exploit-DB #46312 entry.

Detection Methods for CVE-2019-25665

Indicators of Compromise

• Unexpected crashes of RingtoneConverter.exe or related processes
• Windows Event Log entries indicating application faults with exception codes related to access violations
• Crash dump files in system temp directories associated with River Past Ringtone Converter

Detection Strategies

• Monitor for repeated application crashes of River Past Ringtone Converter using Windows Event Log analysis
• Deploy application whitelisting to control which users can run potentially vulnerable legacy software
• Use endpoint detection and response (EDR) solutions to identify abnormal application behavior patterns

Monitoring Recommendations

• Enable Windows Error Reporting to capture crash telemetry for River Past Ringtone Converter
• Configure SIEM rules to alert on multiple application crash events from the same executable
• Review endpoint logs for signs of deliberate exploitation attempts targeting this application

How to Mitigate CVE-2019-25665

Immediate Actions Required

• Consider uninstalling River Past Ringtone Converter 2.7.6.1601 if not essential for business operations
• Restrict access to systems running the vulnerable software to trusted users only
• Implement application control policies to limit who can execute the vulnerable application
• Monitor for any updates from River Past that may address this vulnerability

Patch Information

No vendor patch information is currently available for this vulnerability. The RiverPast Website should be monitored for any security updates. Organizations should consider the VulnCheck Advisory for additional guidance.

Workarounds

• Remove or disable River Past Ringtone Converter from systems where it is not required
• Restrict local access to systems running the vulnerable software to limit potential attackers
• Use alternative ringtone conversion software that is actively maintained and patched
• Implement network segmentation to isolate systems running legacy vulnerable applications

# Disable River Past Ringtone Converter via registry (Windows)
# Backup registry before making changes
reg add "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\RingtoneConverter.exe" /v Debugger /t REG_SZ /d "systray.exe" /f