CVE-2024-27570
📋 TL;DR
This vulnerability allows attackers to cause a Denial of Service (DoS) on LBT T300-T390 routers by exploiting a stack overflow in the ApCliSsid parameter. Attackers can crash affected devices via crafted POST requests, disrupting network services. Organizations using these specific router models with vulnerable firmware are affected.
💻 Affected Systems
- LBT T300-T390 routers
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device crash requiring physical reboot, extended network downtime, and potential for remote code execution if stack overflow can be controlled precisely.
Likely Case
Router becomes unresponsive, requiring manual reboot to restore functionality, causing temporary network disruption.
If Mitigated
Minimal impact with proper network segmentation and monitoring; isolated device failure without affecting broader network.
🎯 Exploit Status
Exploit requires sending crafted POST request to vulnerable endpoint; public GitHub repository contains technical details.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: No
Instructions:
No official patch available. Monitor vendor website for firmware updates and apply immediately when released.
🔧 Temporary Workarounds
Network Segmentation
allIsolate vulnerable routers from untrusted networks to limit attack surface.
Access Control
linuxRestrict web interface access to trusted IP addresses only.
iptables -A INPUT -p tcp --dport 80 -s TRUSTED_IP -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -s TRUSTED_IP -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
🧯 If You Can't Patch
- Replace vulnerable routers with supported models from different vendors
- Implement strict network monitoring for abnormal POST requests to router management interfaces
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface at System > Firmware Upgrade or using SSH/Telnet if enabled.Check Version:
ssh admin@router_ip 'cat /proc/version' or check web interfaceVerify Fix Applied:
Verify firmware version is updated beyond v2.2.1.8 when patch becomes available.📡 Detection & Monitoring
Log Indicators:
- Multiple POST requests to generate_conf_router endpoint
- Router crash/reboot logs
- Abnormal memory usage spikes
Network Indicators:
- Unusual POST requests with long ApCliSsid parameters
- Router management interface becoming unresponsive
SIEM Query:
source="router_logs" AND (uri="/generate_conf_router" OR message="crash" OR message="reboot")