CVE-2020-37171: TapinRadio DOS Vulnerability

CVE-2020-37171 Overview

TapinRadio 2.12.3 contains a denial of service vulnerability in the application proxy username configuration that allows local attackers to crash the application. This buffer overflow vulnerability (CWE-120) enables attackers to overwrite the username field with 10,000 bytes of arbitrary data to trigger an application crash and prevent normal program functionality.

Critical Impact

Local attackers can exploit this vulnerability to cause a complete denial of service by crashing TapinRadio, disrupting users' ability to record and listen to internet radio streams.

Affected Products

• TapinRadio 2.12.3
• Earlier versions of TapinRadio 2.x may also be affected

Discovery Timeline

• 2026-02-07 - CVE CVE-2020-37171 published to NVD
• 2026-02-09 - Last updated in NVD database

Technical Details for CVE-2020-37171

Vulnerability Analysis

This vulnerability stems from a classic buffer overflow condition (CWE-120) in TapinRadio's proxy configuration handling. When processing user-supplied data in the proxy username field, the application fails to properly validate input length boundaries before copying the data into a fixed-size buffer. This allows an attacker to submit an oversized input (approximately 10,000 bytes) that exceeds the allocated buffer space, corrupting adjacent memory and causing the application to crash.

The local attack vector requires user interaction, as the attacker must convince a user to enter or import malicious configuration data, or have direct access to the system where TapinRadio is installed. The exploitation results in high availability impact, rendering the application non-functional until restarted.

Root Cause

The root cause is improper input validation in the proxy username configuration handler. The application allocates a fixed-size buffer for storing the proxy username but does not enforce length restrictions when accepting user input. When excessive data is written to this buffer, it overflows into adjacent memory regions, corrupting critical application data structures and triggering an unhandled exception that crashes the application.

Attack Vector

This is a local attack vector vulnerability that requires either direct system access or user interaction to exploit. An attacker could craft a malicious configuration file or directly manipulate the proxy settings dialog to inject the oversized payload. The attack does not require elevated privileges and can be executed by any user with access to the TapinRadio application settings. Technical details and proof-of-concept information are available through the Exploit-DB #48013 entry.

Detection Methods for CVE-2020-37171

Indicators of Compromise

• Unexpected TapinRadio application crashes, particularly after configuration changes
• Unusually large proxy configuration entries in TapinRadio settings files
• Error logs indicating memory access violations or buffer overflow exceptions
• Modification of TapinRadio configuration files by unauthorized processes

Detection Strategies

• Monitor TapinRadio configuration files for unexpected modifications or abnormally large field values
• Implement application crash monitoring to detect repeated denial of service conditions
• Deploy endpoint detection and response (EDR) solutions to identify suspicious process behavior
• Use file integrity monitoring on TapinRadio installation and configuration directories

Monitoring Recommendations

• Enable Windows Error Reporting to capture crash dumps for TapinRadio process failures
• Configure SIEM rules to alert on repeated application crashes from the same endpoint
• Monitor for attempts to write oversized data to TapinRadio configuration locations
• Implement user behavior analytics to detect unusual configuration modification patterns

How to Mitigate CVE-2020-37171

Immediate Actions Required

• Upgrade TapinRadio to the latest available version from the official Raimersoft website
• Restrict access to TapinRadio configuration files and settings to authorized users only
• Avoid importing untrusted configuration files into TapinRadio
• Consider application whitelisting to prevent unauthorized modifications to TapinRadio

Patch Information

Users should check the Raimersoft TapinRadio page for the latest version that addresses this vulnerability. Additional advisory information is available through the VulnCheck Advisory for TapinRadio.

Workarounds

• Do not use proxy authentication features if not strictly required
• Implement endpoint protection solutions that can detect and block buffer overflow exploitation attempts
• Back up TapinRadio configuration files and restore from known-good backups if corruption is detected
• Consider running TapinRadio in a sandboxed environment to limit impact of potential crashes

# Configuration example
# Restrict permissions on TapinRadio configuration directory (Windows)
# Run in PowerShell as Administrator
icacls "%APPDATA%\TapinRadio" /inheritance:r /grant:r "%USERNAME%:F" /grant:r "SYSTEM:F"