CVE-2024-3875
📋 TL;DR
This critical vulnerability in Tenda F1202 routers allows remote attackers to execute arbitrary code via a stack-based buffer overflow in the fromNatlimit function. Attackers can exploit this by sending specially crafted requests to the /goform/Natlimit endpoint. All users running the affected firmware version are at risk.
💻 Affected Systems
- Tenda F1202
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise leading to persistent remote access, network traffic interception, lateral movement to other devices, and potential botnet recruitment.
Likely Case
Remote code execution allowing attackers to modify router settings, intercept traffic, or use the device as a pivot point for further attacks.
If Mitigated
Limited impact if device is behind strict network segmentation with no internet exposure and all unnecessary services disabled.
🎯 Exploit Status
Exploit code is publicly available on GitHub, making this easily weaponizable by attackers with basic skills.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available - vendor did not respond to disclosure
Restart Required: Yes
Instructions:
No official patch available. Consider replacing affected devices or implementing strict network controls.
🔧 Temporary Workarounds
Disable Remote Management
allDisable web management interface access from WAN/Internet
Access router admin panel -> Advanced Settings -> Remote Management -> Disable
Network Segmentation
allIsolate router management interface to separate VLAN
🧯 If You Can't Patch
- Replace affected Tenda F1202 routers with different models from vendors with better security track records
- Implement strict firewall rules to block all external access to router management interfaces (ports 80/443)
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via admin panel: Login -> System Status -> Firmware VersionCheck Version:
Check web interface or use: curl -s http://router-ip/goform/getStatus | grep versionVerify Fix Applied:
No fix available to verify. Monitor for new firmware releases from Tenda.📡 Detection & Monitoring
Log Indicators:
- Multiple POST requests to /goform/Natlimit with long parameter values
- Unusual process execution or memory errors in system logs
Network Indicators:
- Unusual outbound connections from router to unknown IPs
- Traffic spikes to/from router management interface
SIEM Query:
source="router_logs" AND (uri="/goform/Natlimit" AND method="POST" AND content_length>1000)🔗 References
- https://github.com/abcdefg-png/IoT-vulnerable/blob/main/Tenda/F/F1202/fromNatlimit.md
- https://vuldb.com/?ctiid.260909
- https://vuldb.com/?id.260909
- https://vuldb.com/?submit.312817
- https://github.com/abcdefg-png/IoT-vulnerable/blob/main/Tenda/F/F1202/fromNatlimit.md
- https://vuldb.com/?ctiid.260909
- https://vuldb.com/?id.260909
- https://vuldb.com/?submit.312817
