CVE-2023-48963
📋 TL;DR
CVE-2023-48963 is a buffer overflow vulnerability in Tenda i6 routers that allows remote attackers to execute arbitrary code or cause denial of service by sending specially crafted requests to the /goform/wifiSSIDget endpoint. This affects users of Tenda i6 routers with vulnerable firmware versions.
💻 Affected Systems
- Tenda i6
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete router compromise, credential theft, network traffic interception, and lateral movement to connected devices.
Likely Case
Router crash causing denial of service, requiring physical reset and disrupting network connectivity for all connected devices.
If Mitigated
Limited impact if router is behind firewall with restricted WAN access, though internal attackers could still exploit.
🎯 Exploit Status
Public proof-of-concept code exists in GitHub repositories. Exploitation requires sending crafted HTTP requests to the vulnerable endpoint.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: Yes
Instructions:
1. Check Tenda official website for firmware updates
2. If update available, download and flash via router admin interface
3. Factory reset after update to ensure clean configuration
🔧 Temporary Workarounds
Disable remote management
allPrevent external access to router admin interface
Network segmentation
allIsolate router management interface to separate VLAN
🧯 If You Can't Patch
- Replace vulnerable router with different model or manufacturer
- Place router behind firewall with strict inbound rules blocking all ports except essential services
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface. If version is V1.0.0.8(3856), device is vulnerable.Check Version:
curl -s http://router-ip/goform/getStatus | grep versionVerify Fix Applied:
Verify firmware version has changed from V1.0.0.8(3856) to a newer version after update.📡 Detection & Monitoring
Log Indicators:
- Multiple POST requests to /goform/wifiSSIDget with unusual payload lengths
- Router crash/reboot logs
Network Indicators:
- HTTP requests to router IP on port 80 with /goform/wifiSSIDget path containing long strings
SIEM Query:
source="router_logs" AND (uri_path="/goform/wifiSSIDget" AND content_length>1000)