CVE-2020-36927: DiskPulse Privilege Escalation Flaw

CVE-2020-36927 Overview

CVE-2020-36927 is an unquoted service path vulnerability affecting DiskPulse Enterprise 13.6.14. This Windows service configuration flaw allows local attackers to potentially execute arbitrary code by exploiting the unquoted path in C:\Program Files\Disk Pulse Enterprise\bin\diskpls.exe. Attackers can inject malicious executables into locations along this path to achieve privilege escalation when the service is started.

Critical Impact

Local attackers can achieve privilege escalation and arbitrary code execution by placing malicious executables in the unquoted service path, potentially gaining SYSTEM-level access on affected Windows systems.

Affected Products

• DiskPulse Enterprise 13.6.14
• Windows systems running vulnerable DiskPulse Enterprise service configurations
• Enterprise environments with improperly configured service paths

Discovery Timeline

• 2026-01-16 - CVE CVE-2020-36927 published to NVD
• 2026-01-16 - Last updated in NVD database

Technical Details for CVE-2020-36927

Vulnerability Analysis

This vulnerability stems from an unquoted service path configuration (CWE-428) in DiskPulse Enterprise's Windows service. When a Windows service executable path contains spaces and is not enclosed in quotation marks, the Windows Service Control Manager (SCM) parses the path ambiguously. This parsing behavior creates an opportunity for attackers to place malicious executables at intermediate path locations.

The vulnerable service path C:\Program Files\Disk Pulse Enterprise\bin\diskpls.exe contains multiple spaces. Without proper quoting, Windows attempts to locate and execute files at each space boundary before reaching the intended executable. An attacker with write access to C:\Program.exe or C:\Program Files\Disk.exe could hijack service execution.

Root Cause

The root cause is improper service registration during DiskPulse Enterprise installation. The installer fails to enclose the service executable path in double quotation marks, violating Windows service configuration best practices. This oversight allows the Windows SCM to misinterpret the intended executable path during service startup, restart, or system boot operations.

Attack Vector

The attack requires local access to the target system and write permissions to a directory along the unquoted path. The attack sequence involves:

1. Identifying the vulnerable unquoted service path via wmic service get name,pathname or registry inspection
2. Placing a malicious executable named Program.exe in C:\ or Disk.exe in C:\Program Files\
3. Waiting for the service to restart (manually, via system reboot, or through service failure recovery)
4. The malicious executable runs with the service's privileges, typically SYSTEM

Since no verified code examples are available for this vulnerability, technical details can be found in the Exploit-DB #50012 advisory and the VulnCheck DiskPulse Advisory.

Detection Methods for CVE-2020-36927

Indicators of Compromise

• Presence of unexpected executables named Program.exe, Disk.exe, or similar in C:\ or C:\Program Files\ directories
• Suspicious process execution originating from the DiskPulse Enterprise service
• Unexpected child processes spawned by the Windows Service Control Manager
• File creation events in root directories or intermediate path locations

Detection Strategies

• Query all Windows services for unquoted paths using wmic service get name,pathname,startmode | findstr /i /v "\""
• Monitor Windows Event Logs for service control events (Event IDs 7034, 7035, 7036) associated with DiskPulse
• Deploy endpoint detection rules to alert on executable creation in C:\ root directory
• Use PowerShell scripts to audit service configurations: Get-WmiObject win32_service | Where-Object {$_.PathName -notmatch '^".*"$' -and $_.PathName -match '\s'}

Monitoring Recommendations

• Implement file integrity monitoring on system root and Program Files directories
• Configure SentinelOne to detect suspicious executable placement in common unquoted path exploitation locations
• Enable Windows audit policies for object access on sensitive directories
• Monitor for privilege escalation attempts following service restarts

How to Mitigate CVE-2020-36927

Immediate Actions Required

• Audit the DiskPulse Enterprise service configuration and manually add quotation marks to the service path in the Windows registry
• Restrict write permissions on C:\ and C:\Program Files\ directories to administrators only
• Monitor for unauthorized executables in path hijacking locations
• Consider disabling the service until a patched version is installed

Patch Information

Organizations should check the DiskPulse Official Site for updated versions that address this vulnerability. Upgrading to a patched version that properly quotes the service path is the recommended remediation. Until a patch is available, apply the manual registry fix described below.

Workarounds

• Manually edit the service path in the Windows registry to include quotation marks around the full executable path
• Use the sc config command to reconfigure the service with a properly quoted path
• Implement application whitelisting to prevent unauthorized executable execution
• Apply principle of least privilege to restrict write access to system directories

# Configuration example
# Fix unquoted service path via registry
reg add "HKLM\SYSTEM\CurrentControlSet\Services\DiskPulseEnterprise" /v ImagePath /t REG_EXPAND_SZ /d "\"C:\Program Files\Disk Pulse Enterprise\bin\diskpls.exe\"" /f

# Alternatively, use sc.exe to reconfigure the service
sc config "DiskPulseEnterprise" binPath= "\"C:\Program Files\Disk Pulse Enterprise\bin\diskpls.exe\""

# Verify the fix
wmic service where "name='DiskPulseEnterprise'" get pathname