CVE-2025-1240
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on affected WinZip installations by tricking users into opening malicious 7Z files. Attackers can gain full control of the system with the same privileges as the current user. All WinZip users who process untrusted 7Z files are affected.
💻 Affected Systems
- WinZip
📦 What is this software?
Winzip by Winzip
Winzip by Winzip
Winzip by Winzip
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise leading to data theft, ransomware deployment, or persistent backdoor installation
Likely Case
Malware execution leading to credential harvesting, data exfiltration, or lateral movement within the network
If Mitigated
Limited impact if proper application sandboxing and least privilege principles are enforced
🎯 Exploit Status
Requires user interaction (opening malicious file) but exploitation is reliable once triggered
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check WinZip vendor advisory for specific patched version
Vendor Advisory: https://www.winzip.com/en/support/security-advisories/
Restart Required: No
Instructions:
1. Open WinZip application
2. Navigate to Help > Check for Updates
3. Follow prompts to install latest version
4. Verify update completed successfully
🔧 Temporary Workarounds
Disable 7Z file association
windowsPrevent WinZip from automatically opening 7Z files
Control Panel > Default Programs > Associate a file type or protocol with a program > Select .7z > Change program > Choose different application
Use application control policies
allRestrict execution of WinZip to trusted directories only
🧯 If You Can't Patch
- Implement application allowlisting to block WinZip execution entirely
- Deploy endpoint detection and response (EDR) with behavioral monitoring for suspicious WinZip activity
🔍 How to Verify
Check if Vulnerable:
Check WinZip version against vendor's patched version listCheck Version:
Open WinZip > Help > About WinZipVerify Fix Applied:
Confirm WinZip version is equal to or greater than patched version📡 Detection & Monitoring
Log Indicators:
- Unusual WinZip process spawning child processes
- WinZip accessing unexpected network resources
- Multiple 7Z file processing failures
Network Indicators:
- WinZip process making unexpected outbound connections
- DNS queries from WinZip to suspicious domains
SIEM Query:
process_name:"winzip*" AND (process_spawned:true OR network_connection:true)