CVE-2024-24543
📋 TL;DR
A buffer overflow vulnerability in the setSchedWifi function of Tenda AC9 v.3.0 routers allows remote attackers to execute arbitrary code or cause denial of service by sending specially crafted data. This affects users running firmware version v.15.03.06.42_multi on these devices.
💻 Affected Systems
- Tenda AC9 v.3.0
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, network infiltration, and potential lateral movement to other systems.
Likely Case
Denial of service causing router crashes and network disruption, with potential for limited code execution.
If Mitigated
Isolated impact limited to the router itself if properly segmented from critical networks.
🎯 Exploit Status
Public GitHub repository contains proof-of-concept details; buffer overflow vulnerabilities in IoT devices are frequently weaponized.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: Yes
Instructions:
Check Tenda's official website for firmware updates. If available, download the latest firmware, log into router admin interface, navigate to firmware upgrade section, upload the new firmware file, and apply the update.
🔧 Temporary Workarounds
Network Segmentation
allIsolate the vulnerable router from critical network segments to limit potential damage.
Access Control Lists
linuxImplement firewall rules to restrict access to the router's management interface.
iptables -A INPUT -p tcp --dport 80 -s trusted_network -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
🧯 If You Can't Patch
- Replace the vulnerable device with a supported, patched model
- Implement strict network monitoring and intrusion detection for exploit attempts
🔍 How to Verify
Check if Vulnerable:
Log into router admin interface and check firmware version under System Status or similar section.Check Version:
Check via web interface at http://router_ip or use curl: curl http://router_ip/login/AuthVerify Fix Applied:
Verify firmware version has been updated to a version newer than v.15.03.06.42_multi.📡 Detection & Monitoring
Log Indicators:
- Unusual traffic patterns to router management interface
- Multiple failed connection attempts followed by buffer overflow patterns
Network Indicators:
- Unusual payloads sent to router management port (typically 80/443)
- Traffic patterns matching known exploit signatures
SIEM Query:
source="router_logs" AND (message="*buffer overflow*" OR message="*segmentation fault*")