CVE-2019-14514
📋 TL;DR
CVE-2019-14514 is a critical command injection vulnerability in Microvirt MEmu Android emulator. It allows attackers to execute arbitrary commands with root privileges on the guest Android system by exploiting improper input sanitization in the systemd binary. This affects all MEmu users running versions prior to 7.0.2.
💻 Affected Systems
- Microvirt MEmu Android Emulator
📦 What is this software?
Memu by Microvirt
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the guest Android system with root privileges, allowing installation of malware, data theft, and potential host system compromise through privilege escalation.
Likely Case
Remote code execution on the guest Android system, enabling attackers to install malicious apps, steal sensitive data, or use the compromised system as a foothold for further attacks.
If Mitigated
Limited impact if the vulnerable port is blocked or the emulator is isolated from untrusted networks.
🎯 Exploit Status
Exploitation requires network access to port 21509 on the guest Android system. Public proof-of-concept code is available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 7.0.2 and later
Vendor Advisory: Not publicly available
Restart Required: Yes
Instructions:
1. Download and install MEmu version 7.0.2 or later from the official website. 2. Replace all existing MEmu installations with the patched version. 3. Restart the emulator to apply changes.
🔧 Temporary Workarounds
Block vulnerable port with firewall
windowsBlock TCP port 21509 on the host system to prevent external exploitation
netsh advfirewall firewall add rule name="Block MEmu Port 21509" dir=in action=block protocol=TCP localport=21509
Disable network access for MEmu
allConfigure MEmu to run in isolated network mode without external connectivity
🧯 If You Can't Patch
- Discontinue use of MEmu and switch to alternative Android emulators that are not vulnerable
- Isolate MEmu instances on separate network segments with strict firewall rules blocking all unnecessary ports
🔍 How to Verify
Check if Vulnerable:
Check if MEmu version is below 7.0.2 and verify if port 21509 is listening on the guest Android system using 'netstat -an | findstr 21509' from host command prompt.Check Version:
Check MEmu version in the emulator settings or About section within the MEmu interface.Verify Fix Applied:
Confirm MEmu version is 7.0.2 or higher and verify port 21509 is no longer listening or the systemd binary has been updated.📡 Detection & Monitoring
Log Indicators:
- Unusual network connections to port 21509
- Suspicious command execution in guest Android system logs
Network Indicators:
- TCP connections to port 21509 from unexpected sources
- Unusual outbound traffic from MEmu instances
SIEM Query:
destination_port:21509 AND (source_ip NOT IN [trusted_ips])