CVE-2023-49040
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on Tenda AX1803 routers by sending specially crafted requests to the adslPwd parameter. Attackers can gain full control of affected devices without authentication. All users running vulnerable firmware versions are at risk.
💻 Affected Systems
- Tenda AX1803
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing attacker to install persistent malware, intercept all network traffic, pivot to internal networks, and use device as botnet node.
Likely Case
Router takeover leading to DNS hijacking, credential theft from network traffic, and denial of service attacks.
If Mitigated
Limited impact if device is behind firewall with strict inbound rules and not internet-facing.
🎯 Exploit Status
Public GitHub repository contains exploit details and proof-of-concept. Simple HTTP request with crafted parameter triggers vulnerability.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: Yes
Instructions:
1. Check Tenda support site for firmware updates
2. Download latest firmware for AX1803
3. Log into router admin interface
4. Navigate to System Tools > Firmware Upgrade
5. Upload and install new firmware
6. Reboot router
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to router web interface
Network Segmentation
allIsolate router management interface to trusted network
🧯 If You Can't Patch
- Place router behind firewall with strict inbound rules blocking all external access to management ports
- Change default credentials and implement strong authentication if supported
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router admin interface under System Status or System ToolsCheck Version:
curl -s http://router-ip/goform/getStatus | grep versionVerify Fix Applied:
Verify firmware version is newer than v1.0.0.1 and test with known exploit payloads📡 Detection & Monitoring
Log Indicators:
- HTTP requests to /goform/fast_setting_internet_set with unusual adslPwd parameter values
- Unusual process execution or network connections from router
Network Indicators:
- HTTP POST requests to router IP on port 80/443 containing shell commands in parameters
- Outbound connections from router to suspicious IPs
SIEM Query:
source="router_logs" AND (uri="/goform/fast_setting_internet_set" OR parameter="adslPwd")