CVE-2012-4750
📋 TL;DR
CVE-2012-4750 is a critical remote code execution vulnerability in Ezhometech EzServer 7.0's AMF request processing. Attackers can exploit a heap corruption via memcpy to execute arbitrary code or cause denial of service. Organizations running EzServer 7.0 are affected.
💻 Affected Systems
- Ezhometech EzServer
📦 What is this software?
Ezserver by Ezhometech
⚠️ Risk & Real-World Impact
Worst Case
Remote attacker gains full system control, installs malware, steals data, or creates persistent backdoor.
Likely Case
Remote code execution leading to system compromise, data theft, or service disruption.
If Mitigated
Limited impact if system is isolated, patched, or protected by network controls.
🎯 Exploit Status
Public exploit code exists; exploitation requires sending crafted AMF requests to vulnerable endpoint.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: No official vendor advisory found
Restart Required: No
Instructions:
No official patch available. Consider upgrading to supported version or implementing workarounds.
🔧 Temporary Workarounds
Network Segmentation
allRestrict access to EzServer to trusted networks only
Firewall Rules
linuxBlock external access to EzServer ports (default 80/443)
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
🧯 If You Can't Patch
- Isolate system on separate VLAN with strict access controls
- Implement application firewall to filter AMF requests
🔍 How to Verify
Check if Vulnerable:
Check if EzServer 7.0 is running and accessible on networkCheck Version:
Check application interface or documentation for version informationVerify Fix Applied:
Verify EzServer is upgraded or workarounds are implemented📡 Detection & Monitoring
Log Indicators:
- Unusual AMF request patterns
- Memory corruption errors in logs
- Unexpected process crashes
Network Indicators:
- Malformed AMF requests to EzServer port
- Suspicious payloads in HTTP traffic
SIEM Query:
source="ezserver" AND (event="crash" OR event="memory_error")🔗 References
- https://exchange.xforce.ibmcloud.com/vulnerabilities/79267
- https://packetstormsecurity.com/files/117391/Ezhometech-EzServer-7.0-Remote-Heap-Corruption.html
- https://www.securityfocus.com/archive/1/524430
- https://www.securityfocus.com/bid/55938
- https://exchange.xforce.ibmcloud.com/vulnerabilities/79267
- https://packetstormsecurity.com/files/117391/Ezhometech-EzServer-7.0-Remote-Heap-Corruption.html
- https://www.securityfocus.com/archive/1/524430
- https://www.securityfocus.com/bid/55938
