CVE-2019-6440
📋 TL;DR
CVE-2019-6440 is a critical vulnerability in Zemana AntiMalware where improper update logic handling allows attackers to execute arbitrary code with SYSTEM privileges. This affects all users running Zemana AntiMalware versions before 3.0.658 Beta. The vulnerability enables complete system compromise through malicious update mechanisms.
💻 Affected Systems
- Zemana AntiMalware
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with SYSTEM privileges, allowing installation of persistent malware, data theft, ransomware deployment, and complete control over the affected system.
Likely Case
Remote code execution leading to malware installation, credential theft, and lateral movement within the network.
If Mitigated
Limited impact if proper network segmentation, least privilege principles, and security monitoring are in place to detect and contain exploitation attempts.
🎯 Exploit Status
The vulnerability requires network access to intercept or manipulate update traffic. Exploitation is straightforward once an attacker can control the update process.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.0.658 Beta and later
Vendor Advisory: https://www.zemana.com/whats-new?ProductID=2
Restart Required: Yes
Instructions:
1. Open Zemana AntiMalware. 2. Navigate to Settings > Update. 3. Click 'Check for Updates'. 4. Install version 3.0.658 Beta or later. 5. Restart the system to ensure all components are updated.
🔧 Temporary Workarounds
Disable Automatic Updates
windowsPrevent the vulnerable update mechanism from running automatically
Open Zemana AntiMalware > Settings > Update > Uncheck 'Automatically check for updates'
Network Segmentation
allBlock Zemana update servers at network perimeter
Add firewall rules to block outbound connections to Zemana update domains and IPs
🧯 If You Can't Patch
- Uninstall Zemana AntiMalware and replace with alternative security software
- Implement strict network controls to prevent outbound connections to Zemana update servers
🔍 How to Verify
Check if Vulnerable:
Check Zemana AntiMalware version in the application interface or via 'About' section. Versions below 3.0.658 are vulnerable.Check Version:
Check application GUI or registry at HKEY_LOCAL_MACHINE\SOFTWARE\Zemana\AntiMalware for version informationVerify Fix Applied:
Confirm version is 3.0.658 Beta or higher in the application interface and verify update functionality works without errors.📡 Detection & Monitoring
Log Indicators:
- Unusual update activity from Zemana processes
- Failed update attempts with unusual sources
- Process creation from Zemana update components
Network Indicators:
- Unusual connections to non-Zemana domains from Zemana processes
- Update traffic from unexpected IP addresses
- SSL/TLS certificate anomalies in update communications
SIEM Query:
Process creation where parent_process contains 'zemana' AND (process contains 'powershell' OR process contains 'cmd' OR process contains 'wscript')