CVE-2024-3877
📋 TL;DR
A critical stack-based buffer overflow vulnerability in Tenda F1202 routers allows remote attackers to execute arbitrary code by manipulating the 'qos' parameter in the fromqossetting function. This affects Tenda F1202 routers running firmware version 1.2.0.20(408). Attackers can exploit this without authentication to potentially take full control of affected devices.
💻 Affected Systems
- Tenda F1202
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, creation of persistent backdoors, lateral movement to internal networks, and botnet recruitment.
Likely Case
Remote code execution allowing attackers to modify router settings, intercept network traffic, or use the device as a pivot point for further attacks.
If Mitigated
Limited impact if devices are behind firewalls with strict inbound filtering, though internal exploitation remains possible.
🎯 Exploit Status
Public GitHub repository contains detailed exploitation information. The vulnerability requires no authentication and has straightforward exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: No
Instructions:
No official patch available. Vendor was contacted but did not respond. Consider replacing affected devices or implementing strict network controls.
🔧 Temporary Workarounds
Disable Remote Management
allDisable web management interface access from WAN/Internet to prevent remote exploitation
Access router admin panel > Advanced Settings > Remote Management > Disable
Network Segmentation
allIsolate affected routers in separate VLANs with strict firewall rules
🧯 If You Can't Patch
- Replace affected Tenda F1202 routers with devices from vendors that provide security updates
- Implement strict network access controls: block all inbound traffic to router management interfaces, allow only from trusted management networks
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via admin panel: System Status > Firmware Version. If version is 1.2.0.20(408), device is vulnerable.Check Version:
Check via web interface or SSH if enabled: cat /proc/version or show version commands may varyVerify Fix Applied:
No official fix available to verify. If vendor releases update, verify version is newer than 1.2.0.20(408).📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/fromqossetting with long qos parameters
- Multiple failed buffer overflow attempts in system logs
- Unexpected process crashes or restarts
Network Indicators:
- Unusual traffic patterns to router management interface (typically port 80/443)
- POST requests with abnormally long parameter values to /goform/fromqossetting
SIEM Query:
source="router_logs" AND (url="/goform/fromqossetting" AND parameter_length>1000) OR (event="buffer_overflow" AND process="httpd")🔗 References
- https://github.com/abcdefg-png/IoT-vulnerable/blob/main/Tenda/F/F1202/fromqossetting.md
- https://vuldb.com/?ctiid.260911
- https://vuldb.com/?id.260911
- https://vuldb.com/?submit.312820
- https://github.com/abcdefg-png/IoT-vulnerable/blob/main/Tenda/F/F1202/fromqossetting.md
- https://vuldb.com/?ctiid.260911
- https://vuldb.com/?id.260911
- https://vuldb.com/?submit.312820
