CVE-2019-25307: WorkgroupMail Privilege Escalation Flaw

CVE-2019-25307 Overview

CVE-2019-25307 is an unquoted service path vulnerability affecting WorkgroupMail 7.5.1, a Windows-based mail server solution. The vulnerability exists in the Windows service configuration where the binary path is not properly quoted, allowing local attackers to potentially execute arbitrary code with elevated privileges. When the WorkgroupMail service starts, Windows may incorrectly interpret spaces in the file path, enabling attackers to place malicious executables in strategic locations that will be executed with LocalSystem privileges.

Critical Impact

Successful exploitation allows local attackers to execute arbitrary code with LocalSystem privileges, potentially leading to complete system compromise and lateral movement within the network.

Affected Products

• WorkgroupMail 7.5.1
• WorkgroupMail Mail Server (potentially earlier versions)

Discovery Timeline

• 2026-02-11 - CVE-2019-25307 published to NVD
• 2026-02-11 - Last updated in NVD database

Technical Details for CVE-2019-25307

Vulnerability Analysis

This vulnerability is classified under CWE-428 (Unquoted Search Path or Element), a common Windows service misconfiguration that has been well-documented in privilege escalation attacks. The root issue stems from how Windows processes executable paths containing spaces when those paths are not enclosed in quotation marks.

When a Windows service is configured with a binary path like C:\Program Files\WorkgroupMail\service.exe without quotes, the Windows Service Control Manager (SCM) attempts to locate the executable by progressively parsing the path at each space character. This means Windows will attempt to execute in the following order:

1. C:\Program.exe
2. C:\Program Files\WorkgroupMail\service.exe

An attacker with write access to the C:\ root directory or C:\Program Files\ can place a malicious executable named Program.exe that will be executed with the service's privileges—in this case, LocalSystem—when the service starts or restarts.

Root Cause

The root cause is improper quoting of the service binary path in the Windows registry during WorkgroupMail installation. The service path stored under HKLM\SYSTEM\CurrentControlSet\Services\ lacks the required quotation marks around paths containing spaces. This is a configuration error introduced during the software's installation routine that fails to properly escape the ImagePath value.

Attack Vector

The attack vector is local, requiring the attacker to already have some level of access to the target system. The exploitation sequence involves:

1. Identifying the unquoted service path through Windows service enumeration
2. Determining write permissions on intermediate directories in the path
3. Placing a malicious executable (e.g., Program.exe) in a directory that Windows will search before reaching the legitimate executable
4. Waiting for or triggering a service restart to execute the payload with LocalSystem privileges

The attacker needs local access and write permissions to directories earlier in the unquoted path. Upon service restart (either through system reboot, manual restart, or crash recovery), the malicious executable runs with elevated privileges.

Detection Methods for CVE-2019-25307

Indicators of Compromise

• Unexpected executables named Program.exe or similar in root directories (C:\, C:\Program.exe)
• Unusual files with .exe extension in C:\Program Files\ outside of application subdirectories
• Service startup failures or unexpected behavior from WorkgroupMail service
• Suspicious process creation events originating from service startup with parent process services.exe

Detection Strategies

• Enumerate all Windows services with unquoted paths using PowerShell: Get-WmiObject -Class Win32_Service | Where-Object { $_.PathName -notlike '"*' -and $_.PathName -like '* *' }
• Monitor for file creation events in root directories and common exploitation paths
• Implement file integrity monitoring on critical system directories
• Use endpoint detection to alert on process execution patterns consistent with service hijacking

Monitoring Recommendations

• Enable Windows Security Event logging for service creation and modification (Event IDs 4697, 7045)
• Deploy file system monitoring for executable creation in C:\ and C:\Program Files\
• Utilize SentinelOne's behavioral AI to detect anomalous process execution chains originating from service contexts
• Monitor for registry modifications to service ImagePath values

How to Mitigate CVE-2019-25307

Immediate Actions Required

• Audit all Windows services for unquoted paths using built-in tools or security scanners
• Manually fix the unquoted service path by adding quotation marks around the ImagePath registry value
• Restrict write permissions on root directories and common exploitation paths
• Implement application whitelisting to prevent unauthorized executable execution
• Consider upgrading to a newer version of WorkgroupMail if available, or contact the vendor for a patched installer

Patch Information

No official vendor patch information is available in the CVE data. System administrators should manually remediate by modifying the registry to add quotes around the service path. The fix can be applied by editing the registry key at HKLM\SYSTEM\CurrentControlSet\Services\[ServiceName]\ImagePath to ensure the path is properly quoted.

Additional technical details and exploit information can be found at the Exploit-DB Advisory #47523 and the VulnCheck Advisory.

Workarounds

• Manually quote the service path in the Windows registry by enclosing the full path in double quotes
• Remove write permissions from intermediate directories in the service path for non-administrative users
• Implement endpoint protection solutions capable of detecting and blocking privilege escalation attempts
• Consider running the service under a less privileged account if LocalSystem is not strictly required

# Registry fix to quote the service path
# Run in an elevated Command Prompt or PowerShell
reg query "HKLM\SYSTEM\CurrentControlSet\Services\WorkgroupMail" /v ImagePath
# If unquoted, fix with:
reg add "HKLM\SYSTEM\CurrentControlSet\Services\WorkgroupMail" /v ImagePath /t REG_EXPAND_SZ /d "\"C:\Program Files\WorkgroupMail\service.exe\"" /f