CVE-2020-37247: Kite Privilege Escalation Vulnerability

CVE-2020-37247 Overview

CVE-2020-37247 is an unquoted service path vulnerability in Kite version 4.2.0.1 U1, affecting the KiteService Windows service. The flaw allows local attackers with low privileges to escalate to LocalSystem by placing a malicious executable in a path component preceding the legitimate service binary. When Windows parses the unquoted path containing spaces, it attempts to execute each tokenized path segment in order, enabling arbitrary code execution under the service account. The weakness is classified under CWE-428: Unquoted Search Path or Element.

Critical Impact
Local authenticated attackers can escalate privileges to LocalSystem by dropping a crafted executable into a writable directory within the unquoted service path, gaining full control of the host on service restart.

Affected Products

Kite 4.2.0.1 U1 (Windows desktop AI coding assistant)
Systems running the KiteService Windows service
Hosts where the Kite installation directory permits write access to non-privileged users

Discovery Timeline

2026-05-16 - CVE-2020-37247 published to NVD
2026-05-18 - Last updated in NVD database

Technical Details for CVE-2020-37247

Vulnerability Analysis

The KiteService Windows service is registered with an unquoted ImagePath value that contains spaces. Windows Service Control Manager (SCM) interprets each space as a potential path terminator when no surrounding quotes are present. The SCM then attempts to launch executables matching each tokenized prefix before reaching the intended binary. An attacker who can write to any intermediate directory in the path can stage a malicious binary that runs with the service's elevated privileges.

This class of flaw maps to CWE-428 and is a well-documented Windows local privilege escalation pattern. Exploitation requires existing local access but no special privileges beyond write access to one of the parsed directories, such as a subdirectory of C:\Program Files\ created by the installer with weak ACLs.

Root Cause

The root cause is the failure of the Kite installer to register the KiteService binary path with surrounding quotation marks. Without quotes, Windows parses a path such as C:\Program Files\Kite\KiteService.exe as a series of candidate executables, including C:\Program.exe and C:\Program Files\Kite.exe. The service then executes the first matching file found during startup.

Attack Vector

An attacker with local access enumerates Windows services with unquoted paths using tools such as wmic service get name,pathname,startmode. After identifying KiteService, the attacker writes a malicious executable named to match a tokenized path prefix into a directory that allows writes by standard users. When the service restarts, either at next boot or by triggering a service restart, Windows launches the planted binary as LocalSystem.

No verified exploit code is reproduced here. Refer to Exploit-DB #50975 and the VulnCheck Advisory on Kite U1 for technical details.

Detection Methods for CVE-2020-37247

Indicators of Compromise

Presence of unexpected executables in directories such as C:\Program.exe or C:\Program Files\Kite.exe on hosts running Kite
KiteService process spawning child processes that do not match the legitimate Kite binary signature
New file write events to Kite installation directories by non-administrative users

Detection Strategies

Audit Windows services for unquoted ImagePath values containing spaces using wmic service get name,pathname,startmode | findstr /i /v "\""
Monitor process creation events (Sysmon Event ID 1) where the parent process is services.exe and the child binary path resides outside the expected Kite install directory
Alert on file creation events (Sysmon Event ID 11) targeting top-level Program Files or root drive paths from non-privileged user contexts

Monitoring Recommendations

Continuously inventory service binary path configurations across the Windows fleet and flag any unquoted paths with embedded spaces
Track NTFS ACL changes on the Kite installation directory and parent folders to detect tampering that would enable file planting
Correlate LocalSystem process launches against expected service binaries to surface anomalous execution chains

How to Mitigate CVE-2020-37247

Immediate Actions Required

Uninstall or disable Kite 4.2.0.1 U1 on affected Windows hosts until a fixed version is verified, as Kite reached end-of-life as a product
Manually quote the KiteServiceImagePath registry value at HKLM\SYSTEM\CurrentControlSet\Services\KiteService to neutralize the parsing flaw
Restrict write permissions on the Kite installation directory and any intermediate path components to administrators only

Patch Information

No vendor patch is referenced in the CVE record. Kite ceased operations as a company, leaving the KiteService Windows service without official remediation. Administrators should treat this as an unpatched vulnerability and rely on configuration hardening or removal. Refer to the VulnCheck Advisory on Kite U1 for additional guidance.

Workarounds

Edit the registry value HKLM\SYSTEM\CurrentControlSet\Services\KiteService\ImagePath to wrap the binary path in double quotes, then restart the service
Apply NTFS permissions denying write access to standard users on C:\ root and C:\Program Files\ to prevent file planting
Remove the Kite product entirely from production endpoints if it is no longer required for development workflows

bash

# Configuration example: quote the KiteService ImagePath
reg query "HKLM\SYSTEM\CurrentControlSet\Services\KiteService" /v ImagePath
reg add "HKLM\SYSTEM\CurrentControlSet\Services\KiteService" /v ImagePath /t REG_EXPAND_SZ /d "\"C:\Program Files\Kite\KiteService.exe\"" /f
sc stop KiteService && sc start KiteService