CVE-2023-41613
📋 TL;DR
EzViz Studio v2.2.0 is vulnerable to DLL hijacking, allowing attackers to execute arbitrary code by placing malicious DLL files in directories where the application searches for them. This affects users running the vulnerable version of EzViz Studio on Windows systems. The vulnerability requires local access or social engineering to place malicious files.
💻 Affected Systems
- EzViz Studio
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with attacker gaining the same privileges as the EzViz Studio process, potentially leading to persistence, data theft, or lateral movement.
Likely Case
Local privilege escalation or arbitrary code execution in the context of the EzViz Studio user, allowing attackers to install malware, steal credentials, or access sensitive data.
If Mitigated
Limited impact if proper application whitelisting, DLL signing verification, or least privilege principles are enforced.
🎯 Exploit Status
Exploitation requires placing malicious DLL files in specific directories that EzViz Studio searches. Public proof-of-concept details are available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Unknown
Restart Required: No
Instructions:
Check with EzViz/Hikvision for updated versions. If unavailable, apply workarounds and monitor for security updates.
🔧 Temporary Workarounds
Restrict DLL Search Path
windowsUse Windows policies or application controls to restrict where EzViz Studio can load DLLs from.
Use Windows AppLocker or Software Restriction Policies to block DLL execution from untrusted locations
Remove Unnecessary Permissions
windowsRun EzViz Studio with least privilege and remove write permissions from directories it searches.
icacls "C:\Program Files\EzViz Studio" /deny Users:(OI)(CI)W
Run EzViz Studio as standard user, not administrator
🧯 If You Can't Patch
- Uninstall EzViz Studio if not required
- Implement strict application control policies to prevent unauthorized DLL execution
🔍 How to Verify
Check if Vulnerable:
Check if EzViz Studio version 2.2.0 is installed. Test by placing a test DLL in application directories and monitoring if it gets loaded.Check Version:
Check Help > About in EzViz Studio or examine installed programs in Control PanelVerify Fix Applied:
Verify updated version is installed or workarounds prevent DLL loading from untrusted locations.📡 Detection & Monitoring
Log Indicators:
- Windows Event Logs showing DLL loading from unusual locations
- Process Monitor logs showing EzViz Studio accessing unexpected DLL files
Network Indicators:
- Unusual outbound connections from EzViz Studio process after exploitation
SIEM Query:
Process creation where parent process is EzViz Studio and command line contains suspicious DLL paths