CVE-2023-50469
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on affected Shenzhen Libituo LBT-T300-T310 routers by sending specially crafted requests to the /apply.cgi endpoint. Attackers can exploit a buffer overflow in the ApCliEncrypType parameter to gain full control of the device. Organizations using these specific router models with vulnerable firmware are affected.
💻 Affected Systems
- Shenzhen Libituo Technology Co., Ltd LBT-T300
- Shenzhen Libituo Technology Co., Ltd LBT-T310
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise leading to persistent backdoor installation, network traffic interception, lateral movement to connected systems, and potential data exfiltration.
Likely Case
Remote code execution allowing attackers to modify router configuration, intercept traffic, or use the device as a pivot point for further attacks.
If Mitigated
Limited impact if device is behind firewalls with strict ingress filtering and network segmentation prevents lateral movement.
🎯 Exploit Status
Public proof-of-concept code is available in GitHub repositories. The vulnerability requires no authentication and has straightforward exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: Yes
Instructions:
1. Contact Shenzhen Libituo Technology for firmware updates. 2. If no patch is available, implement workarounds. 3. Consider replacing affected devices with supported alternatives.
🔧 Temporary Workarounds
Network Access Control
linuxRestrict access to the router's web management interface using firewall rules.
iptables -A INPUT -p tcp --dport 80 -s TRUSTED_IP -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
Disable Web Interface
allIf possible, disable the web management interface and use alternative management methods.
🧯 If You Can't Patch
- Isolate affected routers in a dedicated network segment with strict firewall rules.
- Implement network monitoring and intrusion detection specifically for traffic to/from these devices.
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface at http://router-ip/status.cgi or via SSH if available. Look for version v2.2.2.6.Check Version:
curl -s http://router-ip/status.cgi | grep -i versionVerify Fix Applied:
Verify firmware version has been updated to a version later than v2.2.2.6. Test the /apply.cgi endpoint with controlled payloads in a lab environment.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /apply.cgi with long ApCliEncrypType parameters
- Multiple failed authentication attempts followed by successful /apply.cgi access
Network Indicators:
- HTTP requests to /apply.cgi with unusually long parameter values
- Traffic patterns suggesting reverse shell connections from router IP
SIEM Query:
source="router_logs" AND uri_path="/apply.cgi" AND (param_length>100 OR status_code=500)