CVE-2024-41139
📋 TL;DR
This vulnerability allows local authenticated users to escalate privileges to SYSTEM by placing a malicious DLL in a specific folder. It affects SKYSEA Client View installations on Windows systems where users have local login access. Attackers can achieve full system compromise through DLL hijacking.
💻 Affected Systems
- SKYSEA Client View
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full SYSTEM privilege compromise leading to complete host takeover, credential theft, lateral movement, and persistent backdoor installation.
Likely Case
Local privilege escalation allowing attackers to bypass security controls, install malware, or access sensitive data on the compromised system.
If Mitigated
Limited impact if proper access controls prevent unauthorized local login or if DLL execution is restricted through application control policies.
🎯 Exploit Status
Requires local authenticated access and ability to write to a specific folder. No public exploit code is available as of the advisory date.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after Ver.19.210.04e (check vendor for specific fixed version)
Vendor Advisory: https://www.skyseaclientview.net/news/240729_02/
Restart Required: Yes
Instructions:
1. Download the latest version from the vendor website. 2. Install the update following vendor instructions. 3. Restart the system to ensure changes take effect.
🔧 Temporary Workarounds
Restrict local login access
windowsLimit which users can log in locally to systems running SKYSEA Client View
Implement application control
windowsUse Windows Defender Application Control or AppLocker to restrict DLL execution from untrusted locations
🧯 If You Can't Patch
- Implement strict access controls to prevent unauthorized local login to affected systems
- Monitor for suspicious DLL file creation in application directories and implement file integrity monitoring
🔍 How to Verify
Check if Vulnerable:
Check SKYSEA Client View version via Control Panel > Programs and Features or using the vendor's management consoleCheck Version:
Check application properties or vendor management interface for version informationVerify Fix Applied:
Verify version is updated beyond Ver.19.210.04e and check vendor advisory for confirmation📡 Detection & Monitoring
Log Indicators:
- Unexpected DLL file creation in SKYSEA Client View directories
- Process execution with SYSTEM privileges from unusual parent processes
Network Indicators:
- Unusual outbound connections from systems running SKYSEA Client View
SIEM Query:
Process Creation where Parent Process contains 'skysea' AND Integrity Level = 'System'