CVE-2020-37066: GoldWave Buffer Overflow Vulnerability

CVE-2020-37066 Overview

CVE-2020-37066 is a stack-based buffer overflow vulnerability in GoldWave 5.70, a digital audio editing software. The vulnerability exists in the File Open URL dialog functionality, which fails to properly validate user input length. Attackers can exploit this flaw by crafting malicious input containing Unicode-encoded shellcode to trigger a stack-based overflow, ultimately allowing arbitrary code execution on the target system.

Critical Impact

Successful exploitation allows attackers to execute arbitrary code with the privileges of the user running GoldWave, potentially leading to complete system compromise through specially crafted text files.

Affected Products

• GoldWave 5.70
• GoldWave versions prior to security patches

Discovery Timeline

• 2026-02-03 - CVE CVE-2020-37066 published to NVD
• 2026-02-04 - Last updated in NVD database

Technical Details for CVE-2020-37066

Vulnerability Analysis

This vulnerability is classified as CWE-121 (Stack-based Buffer Overflow), a critical memory corruption flaw that occurs when a program writes data beyond the boundaries of a fixed-length stack buffer. In GoldWave 5.70, the File Open URL dialog does not implement proper bounds checking on user-supplied input, creating an exploitable condition.

The attack requires local access and user interaction—specifically, the victim must open a maliciously crafted file or input data through the vulnerable dialog. When triggered, the overflow overwrites critical stack structures including the return address and potentially Structured Exception Handler (SEH) records, enabling attackers to redirect program execution to attacker-controlled shellcode.

The exploitation technique leverages Unicode-encoded shellcode, which allows bypassing certain character filters while still achieving arbitrary code execution. This approach is particularly effective against applications that process Unicode strings without adequate validation.

Root Cause

The root cause of CVE-2020-37066 is insufficient input validation in the File Open URL dialog handler within GoldWave 5.70. The application allocates a fixed-size buffer on the stack to store user-provided URL input but fails to verify that the input length does not exceed the allocated buffer size. When processing oversized input, the data overwrites adjacent stack memory, corrupting return addresses and exception handlers.

Attack Vector

The attack vector for CVE-2020-37066 requires local access to the target system with the following conditions:

1. An attacker crafts a malicious text file containing Unicode-encoded shellcode designed to overflow the vulnerable buffer
2. The victim user must be tricked into opening this file or pasting the malicious content into the File Open URL dialog
3. Upon processing the oversized input, the stack-based buffer overflow is triggered
4. The overflow corrupts stack memory, allowing the attacker to control program execution flow
5. Attacker-supplied shellcode executes with the privileges of the GoldWave process

Technical details and proof-of-concept information can be found at the Exploit-DB #48510 advisory and the VulnCheck Advisory.

Detection Methods for CVE-2020-37066

Indicators of Compromise

• Presence of unusually large text files or URL strings being processed by GoldWave
• GoldWave application crashes with access violation or stack corruption errors
• Unexpected child processes spawned from the GoldWave process (goldwave.exe)
• Suspicious memory writes or stack-smashing detection alerts from endpoint protection

Detection Strategies

• Monitor for abnormal process behavior from goldwave.exe, including unexpected network connections or child process creation
• Implement application whitelisting to detect and prevent unauthorized code execution from the GoldWave process context
• Deploy endpoint detection rules that identify SEH overwrite patterns and stack pivot techniques
• Use memory protection features (DEP/ASLR monitoring) to detect exploitation attempts

Monitoring Recommendations

• Enable verbose logging for file access events involving GoldWave and associated file types
• Configure SIEM alerts for GoldWave process anomalies including crash events and exception handling failures
• Monitor for the creation of suspicious files in temporary directories associated with audio file processing
• Implement behavioral analysis to detect shellcode execution patterns following GoldWave interactions

How to Mitigate CVE-2020-37066

Immediate Actions Required

• Upgrade GoldWave to the latest available version from the official GoldWave website
• Restrict user permissions to prevent execution of untrusted files that could be used in exploitation
• Implement application sandboxing for GoldWave to limit the impact of potential exploitation
• Enable Data Execution Prevention (DEP) and Address Space Layout Randomization (ASLR) system-wide

Patch Information

Users should visit the GoldWave Official Site to obtain the latest version of the software. Version 5.70 is vulnerable and should be upgraded immediately. Check vendor release notes for specific security fixes addressing the buffer overflow vulnerability in the File Open URL dialog component.

Workarounds

• Avoid opening files or URLs from untrusted sources within GoldWave until patched
• Consider using alternative audio editing software while awaiting vendor patches
• Implement network segmentation to limit potential lateral movement if exploitation occurs
• Use endpoint protection solutions that can detect and block buffer overflow exploitation attempts

# Enable DEP for all applications (Windows)
bcdedit /set nx AlwaysOn

# Verify DEP status
wmic os get DataExecutionPrevention_Available,DataExecutionPrevention_SupportPolicy