CVE-2020-37193: ZIP Password Recovery DoS Vulnerability

CVE-2020-37193 Overview

ZIP Password Recovery 2.30 contains a denial of service vulnerability that allows attackers to crash the application by providing maliciously crafted input. Attackers can create a specially prepared text file with specific characters to trigger an application crash when selecting a ZIP file. This vulnerability stems from a buffer overflow condition (CWE-120) that occurs during input processing.

Critical Impact

Attackers can cause application crashes through specially crafted input files, disrupting password recovery operations and potentially causing data loss for users in the middle of recovery processes.

Affected Products

• ZIP Password Recovery version 2.30
• Top Password ZIP Password Recovery software

Discovery Timeline

• 2026-02-11 - CVE CVE-2020-37193 published to NVD
• 2026-02-12 - Last updated in NVD database

Technical Details for CVE-2020-37193

Vulnerability Analysis

This vulnerability is classified as a Buffer Overflow (CWE-120), which occurs when the application fails to properly validate the boundaries of input data. The vulnerability requires local access and user interaction to exploit—an attacker must convince a user to open a maliciously crafted file or interact with specially prepared input within the ZIP Password Recovery application.

The denial of service condition is triggered when the application processes input containing specific character sequences that overflow internal buffers. This causes memory corruption leading to an immediate application crash, rendering the software unusable until restarted.

Root Cause

The root cause of this vulnerability is improper input validation within ZIP Password Recovery 2.30. The application fails to properly validate and sanitize input data before processing, allowing specially crafted input to exceed buffer boundaries. This classic buffer overflow condition (CWE-120) results from insufficient bounds checking during file parsing operations.

Attack Vector

The attack vector is local, requiring an attacker to either have direct access to the target system or employ social engineering to trick a user into opening a malicious file. The exploitation scenario involves:

1. An attacker creates a specially crafted text file containing malicious character sequences
2. The victim opens ZIP Password Recovery 2.30
3. When the user attempts to select or process a ZIP file alongside the malicious input, the application crashes
4. The denial of service disrupts the user's password recovery operations

For detailed technical information about the exploitation mechanism, refer to the Exploit-DB entry #47894 and the VulnCheck Advisory.

Detection Methods for CVE-2020-37193

Indicators of Compromise

• Unexpected crashes of the ZIP Password Recovery application
• Error logs indicating buffer overflows or memory access violations
• Presence of unusually large or malformed text files in directories used with the application
• Windows Event Viewer entries showing application faults for ZIP Password Recovery processes

Detection Strategies

• Monitor for repeated application crashes associated with ZIPPasswordRecovery.exe or related processes
• Implement file integrity monitoring to detect suspicious files with unusual character patterns
• Deploy endpoint detection solutions that can identify buffer overflow exploitation attempts
• Configure application whitelisting to prevent unauthorized file processing

Monitoring Recommendations

• Enable Windows Error Reporting to capture crash dump files for forensic analysis
• Monitor process execution logs for abnormal termination events
• Implement user behavior analytics to detect unusual file access patterns
• Deploy SentinelOne Singularity platform for real-time endpoint monitoring and threat detection

How to Mitigate CVE-2020-37193

Immediate Actions Required

• Upgrade ZIP Password Recovery to the latest available version if a patched version exists
• Restrict access to the application to trusted users only
• Avoid processing files from untrusted or unknown sources
• Consider using alternative password recovery solutions with better input validation
• Implement network segmentation to limit the impact of potential exploitation

Patch Information

No official vendor patch information is currently available in the CVE data. Users should check the Top Password vendor website for updates or contact the vendor directly for security guidance. Monitor the VulnCheck Advisory for any updated remediation information.

Workarounds

• Implement strict file validation procedures before processing any files with ZIP Password Recovery
• Run the application in an isolated environment or virtual machine to contain potential crashes
• Create backup copies of important files before initiating password recovery operations
• Use application sandboxing solutions to limit the impact of application crashes
• Train users to recognize and avoid suspicious files that could trigger the vulnerability

# Example: Running ZIP Password Recovery in isolated environment
# Create a dedicated user account with limited privileges
net user ZIPRecoveryUser /add
net localgroup Users ZIPRecoveryUser /add

# Run application with limited permissions
runas /user:ZIPRecoveryUser "C:\Program Files\ZIP Password Recovery\ZIPPasswordRecovery.exe"