CVE-2021-43460
📋 TL;DR
This CVE describes an Unquoted Service Path vulnerability in System Explorer 7.0.0 that allows local attackers to escalate privileges by placing a malicious executable in a directory with spaces in its path. The vulnerability affects users running System Explorer 7.0.0 on Windows systems where the SystemExplorerHelpService service is installed.
💻 Affected Systems
- System Explorer
📦 What is this software?
System Explorer by Systemexplorer
⚠️ Risk & Real-World Impact
Worst Case
Local attackers can achieve SYSTEM-level privilege escalation, enabling complete system compromise, data theft, and persistent backdoor installation.
Likely Case
Local users or malware with basic user privileges can escalate to SYSTEM privileges, allowing them to install additional malware, disable security controls, or access sensitive system resources.
If Mitigated
With proper access controls and monitoring, exploitation attempts can be detected and blocked before privilege escalation occurs.
🎯 Exploit Status
Exploit code is publicly available on Exploit-DB and GitHub. Requires local access to the system and ability to write to directories in the service path.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: Not available
Restart Required: No
Instructions:
No official patch is available. Consider uninstalling System Explorer 7.0.0 or upgrading to a newer version if available.
🔧 Temporary Workarounds
Quote Service Path
windowsManually modify the service path to include quotes around the executable path
sc config SystemExplorerHelpService binPath= "\"C:\Program Files\System Explorer\SystemExplorerHelpService.exe\""
Remove Write Permissions
windowsRemove write permissions for non-administrative users on directories in the service path
icacls "C:\Program Files\System Explorer" /deny Users:(OI)(CI)W
🧯 If You Can't Patch
- Uninstall System Explorer 7.0.0 completely
- Disable or remove the SystemExplorerHelpService service if not required
🔍 How to Verify
Check if Vulnerable:
Check if System Explorer 7.0.0 is installed and the SystemExplorerHelpService service path is unquoted: sc qc SystemExplorerHelpServiceCheck Version:
Check System Explorer version in Control Panel > Programs and Features or via the application interfaceVerify Fix Applied:
Verify the service path is quoted: sc qc SystemExplorerHelpService should show quotes around the executable path📡 Detection & Monitoring
Log Indicators:
- Windows Event Logs showing service path modifications
- Security logs showing privilege escalation attempts
- Application logs showing unexpected service restarts
Network Indicators:
- Unusual outbound connections from SYSTEM-level processes
- DNS queries for known malware domains from elevated processes
SIEM Query:
EventID=4688 AND NewProcessName LIKE '%SystemExplorerHelpService%' AND SubjectUserName NOT IN ('SYSTEM', 'LOCAL SERVICE', 'NETWORK SERVICE')