CVE-2020-37016 Overview
CVE-2020-37016 is an unquoted service path vulnerability in BarcodeOCR version 19.3.6. The flaw exists in the Windows service configuration, where the executable path is not enclosed in quotation marks. Local attackers with limited privileges can place a malicious executable along the service path. Windows will then execute the attacker-controlled binary with LocalSystem privileges at service startup. The issue is tracked under CWE-428: Unquoted Search Path or Element.
Critical Impact
Successful exploitation grants LocalSystem privileges, enabling full compromise of the affected Windows host from a low-privileged user account.
Affected Products
- BarcodeOCR 19.3.6 on Microsoft Windows
- Earlier BarcodeOCR releases sharing the same service installer
- Windows hosts where the BarcodeOCR service runs as LocalSystem
Discovery Timeline
- 2026-01-29 - CVE-2020-37016 published to the National Vulnerability Database
- 2026-04-15 - Last updated in the NVD database
Technical Details for CVE-2020-37016
Vulnerability Analysis
The BarcodeOCR installer registers a Windows service whose ImagePath registry value contains spaces and is not wrapped in quotation marks. When the Service Control Manager (SCM) parses an unquoted path containing spaces, it attempts to execute each tokenized prefix as a candidate binary. An attacker who can write to any intermediate directory along the path can drop a binary that Windows will execute before the legitimate BarcodeOCR executable. The service runs at boot under LocalSystem, so the planted binary inherits the highest local privilege level. Exploitation requires local access and write permission to at least one directory in the unquoted path, typically achievable when the application is installed outside Program Files or on a drive with permissive ACLs.
Root Cause
The root cause is improper service registration. The installer writes the service binary path to the registry without surrounding it with double quotes. Standard Windows hardening guidance requires that any ImagePath containing whitespace be quoted to prevent ambiguous parsing by the SCM.
Attack Vector
A local user identifies the unquoted path using wmic service get name,pathname,startmode or sc qc <ServiceName>. The attacker then writes a crafted executable named after the first whitespace-delimited token in the path, placing it in a directory they control. On the next service start or system reboot, Windows launches the planted binary as LocalSystem. Verified proof-of-concept details are available in Exploit-DB #48740 and the VulnCheck advisory.
Detection Methods for CVE-2020-37016
Indicators of Compromise
- Unexpected executables in directories along the BarcodeOCR service path, such as C:\Program.exe or similar truncated-path binaries.
- New child processes spawned by services.exe that do not match the legitimate BarcodeOCR binary signature.
- Modifications to the BarcodeOCR service ImagePath registry key under HKLM\SYSTEM\CurrentControlSet\Services.
Detection Strategies
- Enumerate Windows services with wmic service get name,pathname,startmode | findstr /i /v "\"" and flag any unquoted paths containing spaces.
- Hunt for process creation events (Windows Event ID 4688, Sysmon Event ID 1) where the parent is services.exe and the image path is outside the expected installation directory.
- Monitor file creation events in root drives and intermediate folders along service paths for executables created by non-administrative users.
Monitoring Recommendations
- Forward Sysmon and Windows Security logs to a centralized analytics platform for correlation of service-start anomalies. The Singularity Data Lake supports OCSF-normalized ingestion of these telemetry sources for real-time hunting.
- Singularity Endpoint behavioral AI flags unsigned binaries launched by services.exe as LocalSystem, providing autonomous identification of unquoted service path abuse.
- Alert on registry changes to any Services\*\ImagePath value and review service ACL changes weekly.
How to Mitigate CVE-2020-37016
Immediate Actions Required
- Inventory all Windows hosts running BarcodeOCR 19.3.6 and identify those with unquoted service paths.
- Restrict write permissions on the root of any drive hosting the BarcodeOCR installation to administrators only.
- Quote the ImagePath registry value for the BarcodeOCR service until a vendor-supplied fix is applied.
- Audit other third-party services on the host for the same misconfiguration.
Patch Information
No fixed version is currently listed in the NVD entry. Consult the BarcodeOCR vendor site and the VulnCheck advisory for the latest remediation guidance. Upgrade to any later release that ships a corrected installer.
Workarounds
- Manually edit the service ImagePath registry value to wrap the full executable path in double quotes, then restart the service.
- Reinstall the application into a path that contains no spaces, such as C:\BarcodeOCR\, to remove the exploitable condition.
- Apply NTFS access control lists that deny write access to non-administrative users on every directory along the service path.
# Configuration example: quote an unquoted service ImagePath
sc config "BarcodeOCR" binPath= "\"C:\Program Files\BarcodeOCR\BarcodeOCR.exe\""
sc qc "BarcodeOCR"
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
