CVE-2019-25231: dLAN Cockpit Privilege Escalation Flaw

CVE-2019-25231 Overview

CVE-2019-25231 is an unquoted service path vulnerability affecting devolo dLAN Cockpit 4.3.1. The vulnerability exists in the DevoloNetworkService Windows service, which is configured with an unquoted service path containing spaces. This configuration flaw allows local non-privileged users to potentially execute arbitrary code with elevated privileges by placing a malicious executable in a location that Windows will execute before reaching the intended service binary.

When Windows attempts to start a service with an unquoted path containing spaces, it sequentially attempts to execute each possible interpretation of the path. An attacker with write access to the system root directory or intermediate path directories can exploit this behavior to achieve privilege escalation during application startup or system reboot.

Critical Impact

Local attackers can escalate privileges to SYSTEM level by exploiting the unquoted service path, enabling complete system compromise on affected devolo dLAN Cockpit installations.

Affected Products

• devolo dLAN Cockpit version 4.3.1
• DevoloNetworkService Windows service component
• Systems running Windows with devolo dLAN Cockpit installed

Discovery Timeline

• 2026-01-08 - CVE CVE-2019-25231 published to NVD
• 2026-01-08 - Last updated in NVD database

Technical Details for CVE-2019-25231

Vulnerability Analysis

This vulnerability is classified as CWE-428 (Unquoted Search Path or Element). The root issue stems from improper configuration of the Windows service executable path for DevoloNetworkService. When a Windows service path contains spaces and is not enclosed in quotation marks, Windows interprets the path ambiguously, attempting to locate and execute binaries at multiple path locations.

For example, if the service path is configured as C:\Program Files\devolo\dLAN Cockpit\Service.exe, Windows will attempt to execute in the following order:

1. C:\Program.exe
2. C:\Program Files\devolo\dLAN.exe
3. C:\Program Files\devolo\dLAN Cockpit\Service.exe

If an attacker can place a malicious executable at any of the earlier path interpretations, Windows will execute that binary with the service's privilege level (typically SYSTEM) instead of the legitimate service executable.

Root Cause

The vulnerability originates from the installation process of devolo dLAN Cockpit 4.3.1, which registers the DevoloNetworkService with an improperly quoted service path in the Windows registry. The service path stored under HKLM\SYSTEM\CurrentControlSet\Services\DevoloNetworkService lacks the required quotation marks around the path containing spaces, creating the exploitable condition.

Attack Vector

This vulnerability requires local access to the target system. An attacker with the ability to write files to the system root directory (C:\) or intermediate directories in the service path can exploit this vulnerability. The attack is executed by:

1. Identifying the unquoted service path using Windows service enumeration tools
2. Creating a malicious executable named to match one of the ambiguous path interpretations (e.g., Program.exe)
3. Placing the malicious binary in the appropriate location (e.g., C:\Program.exe)
4. Waiting for the service to restart (either through system reboot or manual service restart)

Once the service restarts, Windows will execute the attacker's malicious binary with SYSTEM-level privileges, enabling complete compromise of the local system.

The vulnerability mechanism involves Windows service path parsing behavior. When DevoloNetworkService starts, the operating system attempts to resolve the unquoted path sequentially, potentially executing a malicious binary placed at an earlier path location. For detailed technical analysis, refer to the Zero Science Lab advisory.

Detection Methods for CVE-2019-25231

Indicators of Compromise

• Unexpected executable files in the system root directory (C:\) with names like Program.exe or Devolo.exe
• Unusual service startup behavior or error logs related to DevoloNetworkService
• Suspicious processes running with SYSTEM privileges that originated from non-standard paths
• Registry modifications to service paths or new service registrations

Detection Strategies

• Enumerate all Windows services with unquoted paths using PowerShell or WMIC queries to identify vulnerable configurations
• Monitor file creation events in C:\ and C:\Program Files\devolo\ directories for unexpected executables
• Implement application whitelisting to prevent execution of binaries from non-standard locations
• Deploy endpoint detection rules to alert on service path exploitation attempts

Monitoring Recommendations

• Enable Windows Security Event logging for service control manager events (Event IDs 7000, 7034, 7040, 7045)
• Configure file integrity monitoring on system root and Program Files directories
• Monitor process creation events for binaries executing with SYSTEM privileges from unusual paths
• Implement SentinelOne behavioral AI to detect privilege escalation attempts through service manipulation

How to Mitigate CVE-2019-25231

Immediate Actions Required

• Audit all devolo dLAN Cockpit installations to identify systems running version 4.3.1
• Manually correct the service path by adding quotation marks around the executable path in the Windows registry
• Review file system permissions to restrict write access to the system root directory
• Update to the latest version of devolo dLAN Cockpit if a patched version is available from the vendor

Patch Information

Users should check the official devolo website for updated versions of dLAN Cockpit that address this vulnerability. If no vendor patch is available, manual remediation of the service path configuration is recommended. Additional technical details can be found in the CXSecurity advisory and IBM X-Force vulnerability entry.

Workarounds

• Manually quote the service path in the registry by navigating to HKLM\SYSTEM\CurrentControlSet\Services\DevoloNetworkService and enclosing the ImagePath value in quotation marks
• Restrict file system permissions on C:\ and intermediate directories to prevent unauthorized file creation
• Consider uninstalling devolo dLAN Cockpit if not actively required until a patched version is available
• Implement application control policies to prevent execution of unsigned binaries from sensitive paths

# Configuration example - Manually fix unquoted service path
# Run from elevated command prompt

# Query current service configuration
sc qc DevoloNetworkService

# Modify service path to include quotes (adjust path as needed)
sc config DevoloNetworkService binPath= "\"C:\Program Files\devolo\dLAN Cockpit\DevoloNetworkService.exe\""

# Verify the change
sc qc DevoloNetworkService