CVE-2024-40535
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on Shenzhen Libituo Technology Co., Ltd LBT-T300-T400 devices by exploiting a stack buffer overflow in the config_3g_para function via the apn_name_3g parameter. Attackers can potentially gain full control of affected devices. Organizations using these specific models are affected.
💻 Affected Systems
- Shenzhen Libituo Technology Co., Ltd LBT-T300-T400
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, lateral movement to internal networks, and persistent backdoor installation.
Likely Case
Device takeover enabling traffic interception, credential theft, and use as attack platform.
If Mitigated
Limited impact if devices are isolated in separate network segments with strict firewall rules.
🎯 Exploit Status
Public proof-of-concept available on GitHub. Exploitation requires sending specially crafted requests to the vulnerable parameter.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None known
Restart Required: No
Instructions:
No official patch available. Contact vendor Shenzhen Libituo Technology Co., Ltd for firmware updates.
🔧 Temporary Workarounds
Network Segmentation
allIsolate affected devices in separate VLAN with strict firewall rules
Disable 3G Configuration Interface
allDisable or restrict access to the 3G configuration functionality if not required
🧯 If You Can't Patch
- Remove devices from internet-facing positions immediately
- Implement strict network access controls allowing only necessary traffic
🔍 How to Verify
Check if Vulnerable:
Check device firmware version via web interface or CLI. If version is v3.2, device is vulnerable.Check Version:
Check device web interface or use vendor-specific CLI commandsVerify Fix Applied:
Verify firmware has been updated to version newer than v3.2📡 Detection & Monitoring
Log Indicators:
- Unusual requests to config_3g_para endpoint
- Large payloads in apn_name_3g parameter
- Device crash/restart logs
Network Indicators:
- Unusual traffic patterns to device management interface
- Exploit payload patterns in network traffic
SIEM Query:
source_ip=* AND (uri_path="*config_3g_para*" OR parameter="*apn_name_3g*") AND payload_size>1000