CVE-2020-37016: BarcodeOCR Privilege Escalation Flaw

CVE-2020-37016 Overview

BarcodeOCR 19.3.6 contains an unquoted service path vulnerability (CWE-428) that allows local attackers to execute code with elevated privileges during system startup. This vulnerability exists because the Windows service executable path is not properly enclosed in quotation marks, enabling attackers to exploit the path resolution behavior to inject malicious executables that will run with LocalSystem privileges.

Critical Impact

Local attackers can achieve privilege escalation to LocalSystem by exploiting the unquoted service path, potentially gaining complete control over the affected system.

Affected Products

• BarcodeOCR 19.3.6

Discovery Timeline

• 2026-01-29 - CVE CVE-2020-37016 published to NVD
• 2026-01-29 - Last updated in NVD database

Technical Details for CVE-2020-37016

Vulnerability Analysis

This vulnerability is classified as an Unquoted Service Path issue (CWE-428), a common misconfiguration in Windows services. When a Windows service is registered with a path that contains spaces and is not enclosed in quotation marks, the Windows Service Control Manager (SCM) attempts to resolve the path by trying different combinations of the path components.

The root issue stems from how Windows handles executable paths during service startup. If the service path is C:\Program Files\Barcode OCR\service.exe without quotes, Windows will sequentially attempt to execute C:\Program.exe, C:\Program Files\Barcode.exe, and then the intended executable. An attacker with write access to C:\ or C:\Program Files\ can plant a malicious executable at one of these intermediate paths.

Root Cause

The service registration in BarcodeOCR 19.3.6 fails to properly quote the executable path containing spaces. This oversight in the installation routine or service configuration allows the Windows path resolution mechanism to be abused for privilege escalation.

Attack Vector

The attack requires local access to the system and write permissions to a directory that falls within the unquoted path resolution chain. When the system boots or the service restarts, Windows will execute the attacker's malicious executable with LocalSystem privileges instead of the legitimate BarcodeOCR service binary.

The exploitation process involves:

1. Identifying the unquoted service path in the Windows registry
2. Creating a malicious executable named to match an intermediate path segment
3. Placing the malicious executable in an accessible directory along the path
4. Waiting for system reboot or service restart to trigger execution

Technical details and proof-of-concept information are available in the Exploit-DB #48740 entry.

Detection Methods for CVE-2020-37016

Indicators of Compromise

• Unexpected executables named Program.exe, Barcode.exe, or similar in root directories or parent folders of the BarcodeOCR installation path
• Unusual process spawning from the BarcodeOCR service context
• Modified or new files in C:\ or C:\Program Files\ that do not match legitimate software installations

Detection Strategies

• Query the Windows registry for services with unquoted paths containing spaces using PowerShell or WMI queries
• Monitor for file creation events in directories along the unquoted service path
• Use endpoint detection tools to identify suspicious executables with names matching path segments
• Implement SentinelOne behavioral AI to detect anomalous process execution from service contexts

Monitoring Recommendations

• Enable Windows Security Event logging for service installation and modification events (Event ID 7045)
• Configure file integrity monitoring on directories commonly targeted by unquoted path attacks
• Deploy SentinelOne agents to leverage real-time behavioral analysis and threat detection for privilege escalation attempts

How to Mitigate CVE-2020-37016

Immediate Actions Required

• Audit the BarcodeOCR service path configuration using the Windows Services console or sc qc command
• Add quotation marks around the service executable path in the Windows registry if unquoted
• Restrict write permissions on directories that fall within the service path resolution chain
• Consider upgrading to a patched version if available from the vendor

Patch Information

No official vendor patch information is available in the CVE data. Organizations should contact BarcodeOCR support via the Barcode OCR Homepage for guidance on patched versions. The VulnCheck Advisory for BarcodeOCR may contain additional remediation details.

Workarounds

• Manually correct the service path by adding quotation marks around the ImagePath value in the registry
• Implement strict file system permissions to prevent unauthorized write access to vulnerable directories
• Use application control policies to restrict execution of unauthorized binaries
• Deploy SentinelOne's application control features to block execution of malicious payloads in critical directories

# Configuration example - Verify and fix unquoted service path
# Query the current service configuration
sc qc "BarcodeOCR"

# Example registry fix using reg command (run as Administrator)
# Replace the unquoted path with a properly quoted path
reg add "HKLM\SYSTEM\CurrentControlSet\Services\BarcodeOCR" /v ImagePath /t REG_EXPAND_SZ /d "\"C:\Program Files\Barcode OCR\service.exe\"" /f