CVE-2024-6962
📋 TL;DR
A critical stack-based buffer overflow vulnerability in Tenda O3 routers allows remote attackers to execute arbitrary code by manipulating QoS settings parameters. This affects Tenda O3 router firmware version 1.0.0.10. Attackers can exploit this without authentication to potentially take full control of affected devices.
💻 Affected Systems
- Tenda O3 router
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, persistence installation, lateral movement to internal networks, and data exfiltration.
Likely Case
Device takeover enabling network traffic interception, DNS hijacking, or botnet recruitment for DDoS attacks.
If Mitigated
Denial of service or device crash if exploit fails, but proper controls should prevent exploitation entirely.
🎯 Exploit Status
Public GitHub repository contains detailed exploitation information. The vendor did not respond to disclosure attempts.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: No
Instructions:
No official patch available. Consider workarounds or device replacement.
🔧 Temporary Workarounds
Disable remote management
allDisable web management interface from WAN/Internet access
Access router admin panel -> System -> Remote Management -> Disable
Network segmentation
allIsolate Tenda O3 routers in separate VLAN with restricted access
🧯 If You Can't Patch
- Replace affected Tenda O3 routers with different models from vendors with better security track records
- Implement strict network firewall rules blocking all inbound traffic to router management interfaces
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via admin panel: System -> Firmware Upgrade. If version is 1.0.0.10, device is vulnerable.Check Version:
curl -s http://router-ip/goform/getStatus | grep versionVerify Fix Applied:
No official fix available to verify. Monitor for firmware updates from Tenda.📡 Detection & Monitoring
Log Indicators:
- Multiple POST requests to /goform/formQosSet with unusually long parameter values
- Router crash/reboot logs
- Unusual process execution in system logs
Network Indicators:
- Exploit traffic patterns to router management interface
- Unusual outbound connections from router after compromise
- DNS queries to suspicious domains from router
SIEM Query:
source="router_logs" AND (url="/goform/formQosSet" AND (param_length>1000 OR contains(param,"\x90\x90")))🔗 References
- https://github.com/abcdefg-png/IoT-vulnerable/blob/main/Tenda/O3V2.0/formQosSet.md
- https://vuldb.com/?ctiid.272116
- https://vuldb.com/?id.272116
- https://vuldb.com/?submit.374583
- https://github.com/abcdefg-png/IoT-vulnerable/blob/main/Tenda/O3V2.0/formQosSet.md
- https://vuldb.com/?ctiid.272116
- https://vuldb.com/?id.272116
- https://vuldb.com/?submit.374583
