CVE-2020-37070
📋 TL;DR
CVE-2020-37070 is a critical buffer overflow vulnerability in CloudMe 1.11.2 that allows remote attackers to execute arbitrary code by sending specially crafted network packets to port 8888. This affects all users running the vulnerable CloudMe software version, enabling complete system compromise.
💻 Affected Systems
- CloudMe
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with attacker gaining complete control over the affected system, enabling data theft, ransomware deployment, or use as a botnet node.
Likely Case
Remote code execution leading to malware installation, data exfiltration, or lateral movement within the network.
If Mitigated
Limited impact if proper network segmentation and access controls prevent exploitation attempts.
🎯 Exploit Status
Public exploit code is available on Exploit-DB (ID 48499), making this easily weaponizable by attackers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.12.0 or later
Vendor Advisory: https://www.cloudme.com/en
Restart Required: Yes
Instructions:
1. Download and install CloudMe version 1.12.0 or later from the official website. 2. Stop the CloudMe service. 3. Install the update. 4. Restart the CloudMe service.
🔧 Temporary Workarounds
Block Port 8888
windowsBlock inbound traffic to port 8888 at the network perimeter to prevent external exploitation.
netsh advfirewall firewall add rule name="Block CloudMe" dir=in action=block protocol=TCP localport=8888
Restrict Network Access
windowsConfigure firewall rules to only allow trusted IP addresses to access port 8888.
netsh advfirewall firewall add rule name="Allow CloudMe Trusted" dir=in action=allow protocol=TCP localport=8888 remoteip=192.168.1.0/24
🧯 If You Can't Patch
- Implement strict network segmentation to isolate CloudMe systems from critical assets.
- Deploy intrusion detection systems (IDS) to monitor for exploitation attempts on port 8888.
🔍 How to Verify
Check if Vulnerable:
Check CloudMe version by examining the application interface or installation directory. Version 1.11.2 is vulnerable.Check Version:
Check the CloudMe application interface or installation directory for version information.Verify Fix Applied:
Verify CloudMe version is 1.12.0 or later and test that the service no longer crashes when receiving malformed packets on port 8888.📡 Detection & Monitoring
Log Indicators:
- Unusual process creation from CloudMe service
- Crash logs from CloudMe application
- Multiple connection attempts to port 8888 from single IP
Network Indicators:
- Unusual traffic patterns to port 8888
- Large payloads sent to port 8888
- Exploit-specific patterns in network traffic
SIEM Query:
source="firewall" dest_port=8888 AND (payload_size>1000 OR src_ip_count>10)