CVE-2022-25457
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on Tenda AC6 routers via a stack overflow in the SetSysTimeCfg function. Attackers can exploit this by sending specially crafted requests to the ntpserver parameter. Users running vulnerable firmware versions are affected.
💻 Affected Systems
- Tenda AC6
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise leading to persistent backdoor installation, network traffic interception, and lateral movement to other devices on the network.
Likely Case
Remote code execution allowing attackers to modify router settings, intercept traffic, or use the device as part of a botnet.
If Mitigated
Limited impact if device is behind firewall with restricted WAN access and proper network segmentation.
🎯 Exploit Status
Public exploit code available in GitHub repositories. Exploitation requires network access to web interface.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: Yes
Instructions:
1. Check Tenda website for firmware updates. 2. Download latest firmware. 3. Access router web interface. 4. Navigate to System Tools > Firmware Upgrade. 5. Upload new firmware file. 6. Wait for reboot.
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to web interface
Access router settings > System Tools > Remote Management > Disable
Network Segmentation
allIsolate router management interface
🧯 If You Can't Patch
- Replace affected device with supported model
- Implement strict firewall rules blocking all WAN access to router management interface
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router web interface: System Status > Firmware VersionCheck Version:
curl -s http://router-ip/goform/getStatus | grep versionVerify Fix Applied:
Verify firmware version is newer than v15.03.05.09_multi📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/SetSysTimeCfg
- Large ntpserver parameter values in web logs
Network Indicators:
- Exploit traffic patterns to router management port
- Unexpected outbound connections from router
SIEM Query:
source="router_logs" AND uri="/goform/SetSysTimeCfg" AND parameter="ntpserver" AND length(value)>100