CVE-2024-4170
📋 TL;DR
This critical vulnerability in Tenda 4G300 routers allows remote attackers to execute arbitrary code via a stack-based buffer overflow in the sub_429A30 function. Attackers can exploit this to take full control of affected devices. All users of Tenda 4G300 routers with vulnerable firmware are affected.
💻 Affected Systems
- Tenda 4G300
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise leading to persistent backdoor installation, network traffic interception, lateral movement to internal networks, and 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 devices are behind firewalls with strict inbound filtering, though internal network exposure remains a risk.
🎯 Exploit Status
Detailed technical analysis and proof-of-concept information is publicly available on GitHub. The vulnerability is remotely exploitable without authentication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: Yes
Instructions:
No official patch is available. Monitor Tenda's website for firmware updates. If an update becomes available, download from official sources and apply through the router's web interface.
🔧 Temporary Workarounds
Network Segmentation
allIsolate affected routers from critical internal networks using VLANs or separate network segments
Firewall Restrictions
allBlock all inbound traffic to the router's management interface from untrusted networks
🧯 If You Can't Patch
- Replace affected devices with alternative models from vendors with active security support
- Implement strict network monitoring and anomaly detection for traffic to/from affected routers
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface at http://router_ip or using command: telnet router_ip (if enabled) and check versionCheck Version:
Check router web interface under System Status or Settings > Firmware UpgradeVerify Fix Applied:
Verify firmware version has been updated to a version later than 1.01.42📡 Detection & Monitoring
Log Indicators:
- Unusual traffic patterns to router management interface
- Multiple failed login attempts followed by successful access
- Unexpected configuration changes
Network Indicators:
- Unusual outbound connections from router
- Traffic to known malicious IPs from router
- Port scanning originating from router
SIEM Query:
source_ip=router_ip AND (event_type="configuration_change" OR dest_port=80,443,8080,8443) AND user_agent contains unusual patterns🔗 References
- https://github.com/abcdefg-png/IoT-vulnerable/blob/main/Tenda/G3/4G300/sub_429A30.md
- https://vuldb.com/?ctiid.261989
- https://vuldb.com/?id.261989
- https://vuldb.com/?submit.318991
- https://github.com/abcdefg-png/IoT-vulnerable/blob/main/Tenda/G3/4G300/sub_429A30.md
- https://vuldb.com/?ctiid.261989
- https://vuldb.com/?id.261989
- https://vuldb.com/?submit.318991
