CVE-2022-50924: Private Internet Access Privilege Escalation

CVE-2022-50924 Overview

Private Internet Access 3.3 contains an unquoted service path vulnerability (CWE-428) that allows local users to potentially execute arbitrary code with elevated system privileges. Attackers can exploit the unquoted path in the service configuration to inject malicious code that would execute with LocalSystem permissions during service startup.

Critical Impact

Local privilege escalation to SYSTEM level access through unquoted service path exploitation

Affected Products

• Private Internet Access version 3.3
• Private Internet Access VPN Client (Windows)

Discovery Timeline

• 2026-01-13 - CVE CVE-2022-50924 published to NVD
• 2026-01-13 - Last updated in NVD database

Technical Details for CVE-2022-50924

Vulnerability Analysis

This vulnerability falls under CWE-428 (Unquoted Search Path or Element), a well-known Windows privilege escalation technique. When a Windows service is configured with an executable path containing spaces that is not enclosed in quotation marks, the Windows Service Control Manager (SCM) parses the path in a predictable manner that can be exploited by attackers.

The Private Internet Access VPN client version 3.3 registers a Windows service with an unquoted path. When the service starts, Windows attempts to locate the executable by parsing the path at each space character, creating opportunities for code execution if an attacker can place a malicious executable in one of the parsed locations.

This is a local attack vector requiring the attacker to have some level of access to the target system. Successful exploitation grants the attacker code execution with LocalSystem privileges, the highest privilege level on a Windows system.

Root Cause

The root cause is improper service registration where the executable path was not properly enclosed in quotation marks. When installing or configuring the PIA service, the installer failed to wrap the service binary path in quotes despite the path containing spaces (typically in locations like C:\Program Files\Private Internet Access\).

Windows CreateService and ChangeServiceConfig APIs require explicit quoting of paths with spaces to prevent path hijacking. The absence of these quotes creates the parsing ambiguity that enables this attack.

Attack Vector

The attack requires local access to the target system. An attacker with limited user privileges can exploit this vulnerability by:

1. Identifying the unquoted service path through registry inspection or service configuration queries
2. Determining which portion of the path is writable with their current privileges
3. Placing a malicious executable at one of the intermediate parsed locations (e.g., C:\Program.exe or C:\Program Files\Private.exe)
4. Waiting for or triggering a service restart, system reboot, or manual service start

When the service restarts, Windows SCM parses the unquoted path and may execute the attacker's malicious payload with LocalSystem privileges instead of the legitimate PIA executable. For additional technical details, refer to the Exploit-DB entry #50804 and the VulnCheck Advisory.

Detection Methods for CVE-2022-50924

Indicators of Compromise

• Presence of unexpected executables named Program.exe, Private.exe, or similar in C:\ or C:\Program Files\ directories
• Suspicious process creation events with parent process being services.exe but unexpected child executable paths
• Registry modifications to PIA service configuration entries
• Unusual file creation activity in system root or Program Files directories

Detection Strategies

• Query Windows services for unquoted paths using PowerShell: Get-WmiObject Win32_Service | Where-Object { $_.PathName -notlike '"*' -and $_.PathName -like '* *' }
• Monitor for file creation events in C:\ and C:\Program Files\ for executables matching path segment names
• Implement application whitelisting to prevent unauthorized executable execution
• Use SentinelOne behavioral AI to detect privilege escalation attempts via service manipulation

Monitoring Recommendations

• Enable Windows Security Event logging for service installation and modification (Event IDs 7045, 7040)
• Monitor for process creation events where services.exe spawns unexpected child processes
• Alert on executable file creation in root directories and Program Files base paths
• Track registry changes to HKLM\SYSTEM\CurrentControlSet\Services\PrivateInternetAccess* keys

How to Mitigate CVE-2022-50924

Immediate Actions Required

• Update Private Internet Access to the latest available version from the official download page
• Manually audit and correct the service path by adding quotation marks around the executable path in the registry
• Remove any suspicious executables from C:\ and C:\Program Files\ base directories
• Restrict write permissions on system root and Program Files directories to administrators only

Patch Information

Users should update to the latest version of Private Internet Access available from the vendor's website. Check the VulnCheck Advisory for the most current remediation guidance.

Workarounds

• Manually fix the service path by modifying the registry to include quotation marks around the ImagePath value
• Implement strict file system ACLs to prevent non-administrative users from writing to exploitable path locations
• Use application control solutions to block execution of unauthorized binaries
• Deploy SentinelOne endpoint protection for real-time detection and prevention of privilege escalation attempts

# PowerShell command to identify and fix unquoted service paths
# Run as Administrator
$service = Get-WmiObject Win32_Service | Where-Object { $_.Name -like "*PrivateInternetAccess*" }
$path = $service.PathName
if ($path -notlike '"*') {
    $newPath = '"' + $path + '"'
    sc.exe config $service.Name binPath= $newPath
}