CVE-2025-63916
📋 TL;DR
MyScreenTools v2.2.1.0 contains a critical OS command injection vulnerability in its GIF compression tool. Attackers can execute arbitrary system commands with the privileges of the user running the application by injecting malicious file paths. This affects all users running the vulnerable version of MyScreenTools.
💻 Affected Systems
- MyScreenTools
📦 What is this software?
Myscreentools by Luotengyuan
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise leading to data theft, ransomware deployment, or complete system takeover if the application runs with administrative privileges.
Likely Case
Local privilege escalation, data exfiltration, or installation of backdoors/malware on the affected system.
If Mitigated
Limited impact if application runs with minimal privileges and proper network segmentation is in place.
🎯 Exploit Status
Exploitation requires user interaction to use the GIF compression feature with malicious file paths. Public proof-of-concept details are available in the GitHub repository.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None known
Restart Required: No
Instructions:
No official patch available. Consider the workarounds below or discontinue use of the vulnerable version.
🔧 Temporary Workarounds
Input Validation and Sanitization
windowsImplement proper input validation and sanitization for file paths before passing to cmd.exe
Run with Minimal Privileges
windowsRun MyScreenTools with a non-administrative user account to limit potential damage
🧯 If You Can't Patch
- Disable or remove the GIF compression functionality from MyScreenTools
- Implement application whitelisting to prevent execution of unauthorized commands
🔍 How to Verify
Check if Vulnerable:
Check if MyScreenTools version is 2.2.1.0 and review the GIFSicleTool\Form_gif_sicle_tool.cs file for unsanitized user input in CMD() functionCheck Version:
Check application properties or about dialog for version informationVerify Fix Applied:
Verify that file path inputs are properly validated and sanitized before being passed to cmd.exe📡 Detection & Monitoring
Log Indicators:
- Unusual cmd.exe processes spawned by MyScreenTools
- Suspicious command-line arguments containing special characters or multiple commands
Network Indicators:
- Unexpected outbound connections from MyScreenTools process
SIEM Query:
Process Creation where ParentImage contains 'MyScreenTools' and (CommandLine contains '&' or CommandLine contains '|' or CommandLine contains ';' or CommandLine contains '`')