CVE-2024-4113
📋 TL;DR
This critical vulnerability in Tenda TX9 routers allows remote attackers to execute arbitrary code via a stack-based buffer overflow in the SetSysTimeCfg function. Attackers can exploit this to take full control of affected devices. All users running vulnerable firmware versions are at risk.
💻 Affected Systems
- Tenda TX9
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise leading to persistent backdoor installation, network traffic interception, lateral movement to other devices, 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 exploitation remains possible.
🎯 Exploit Status
Public exploit details are available on GitHub, making exploitation straightforward for attackers. The vendor has not responded to disclosure attempts.
🛠️ 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: 1. Download from official Tenda site 2. Log into router admin interface 3. Navigate to firmware upgrade section 4. Upload new firmware file 5. Wait for reboot and verify version.
🔧 Temporary Workarounds
Disable remote management
allPrevent external access to the vulnerable web interface
Log into router admin → System → Remote Management → Disable
Network segmentation
allIsolate TX9 routers from critical networks
Configure firewall rules to restrict access to router management interface
🧯 If You Can't Patch
- Replace vulnerable devices with patched alternatives from different vendors
- Implement strict network access controls to limit exposure to the router's management interface
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router admin interface under System Status. If version is exactly 22.03.02.10, the device is vulnerable.Check Version:
curl -s http://router-ip/goform/GetSysInfo | grep versionVerify Fix Applied:
Verify firmware version has changed from 22.03.02.10 to a newer version. Test by attempting to access /goform/SetSysTimeCfg with malformed time parameter (in controlled environment).📡 Detection & Monitoring
Log Indicators:
- Multiple failed POST requests to /goform/SetSysTimeCfg
- Unusual time parameter values in web logs
- Router reboot events following web interface access
Network Indicators:
- HTTP POST requests to /goform/SetSysTimeCfg with unusually long time parameters
- Traffic patterns suggesting reverse shell connections from router
SIEM Query:
source="router_logs" AND (uri_path="/goform/SetSysTimeCfg" AND content_length>100) OR (process="httpd" AND memory_usage_spike)🔗 References
- https://github.com/abcdefg-png/IoT-vulnerable/blob/main/Tenda/TX9/fromSetSysTime.md
- https://vuldb.com/?ctiid.261856
- https://vuldb.com/?id.261856
- https://vuldb.com/?submit.317217
- https://github.com/abcdefg-png/IoT-vulnerable/blob/main/Tenda/TX9/fromSetSysTime.md
- https://vuldb.com/?ctiid.261856
- https://vuldb.com/?id.261856
- https://vuldb.com/?submit.317217
