CVE-2021-20692
📋 TL;DR
A directory traversal vulnerability in Archive collectively operation utility allows attackers to create or overwrite files anywhere on the system by tricking users into extracting malicious ZIP archives. This affects versions 2.10.1.0 and earlier of the software. Users who extract untrusted ZIP files with this utility are vulnerable.
💻 Affected Systems
- Archive collectively operation utility
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise through arbitrary file overwrite, potentially leading to remote code execution, data destruction, or privilege escalation.
Likely Case
Local file system corruption, data loss, or malware installation through overwritten system files.
If Mitigated
Limited impact if user runs with minimal privileges and only extracts trusted archives.
🎯 Exploit Status
Exploitation requires user interaction to extract a malicious ZIP file.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.10.2.0 or later
Vendor Advisory: http://www.eikisoft.com/release01.html
Restart Required: No
Instructions:
1. Download latest version from vendor website. 2. Uninstall current version. 3. Install updated version. 4. Verify version is 2.10.2.0 or higher.
🔧 Temporary Workarounds
Use alternative archive software
windowsUse Windows built-in ZIP functionality or other trusted archive utilities instead.
Restrict user privileges
windowsRun software with limited user account privileges to reduce impact of file overwrites.
🧯 If You Can't Patch
- Educate users to never extract ZIP files from untrusted sources with this utility
- Implement application whitelisting to block execution of the vulnerable software
🔍 How to Verify
Check if Vulnerable:
Check software version in Help > About menu. If version is 2.10.1.0 or earlier, system is vulnerable.Check Version:
Check Help > About menu in the application interfaceVerify Fix Applied:
Verify version is 2.10.2.0 or later in Help > About menu.📡 Detection & Monitoring
Log Indicators:
- Unusual file creation/modification events in system logs
- Archive utility process spawning unexpected file operations
Network Indicators:
- Downloads of ZIP files followed by archive utility execution
SIEM Query:
Process Creation where Image contains 'archive' AND CommandLine contains '.zip'