CVE-2024-7585
📋 TL;DR
This critical buffer overflow vulnerability in Tenda i22 routers allows remote attackers to execute arbitrary code by sending specially crafted requests to the web authentication function. Attackers can exploit this without authentication to potentially take full control of affected devices. All users of Tenda i22 routers with firmware version 1.0.0.3(4687) are affected.
💻 Affected Systems
- Tenda i22
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, 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
Denial of service if exploit fails or is detected by network monitoring, with potential device instability.
🎯 Exploit Status
Public exploit code is available on GitHub, making exploitation straightforward for attackers with basic skills.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: Yes
Instructions:
No official patch available. Contact Tenda support for firmware updates. If an update becomes available, download from official Tenda website, upload to router via web interface, and reboot.
🔧 Temporary Workarounds
Disable web portal authentication
allIf not needed, disable the web portal authentication feature that contains the vulnerable function
Network segmentation
allIsolate Tenda i22 routers from internet and critical internal networks
🧯 If You Can't Patch
- Replace affected Tenda i22 routers with different models from vendors that provide security updates
- Implement strict network access controls to limit access to router management interfaces
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface at 192.168.0.1 or 192.168.1.1. Navigate to System Status or About page.Check Version:
curl -s http://router-ip/goform/getStatus | grep version or check web interfaceVerify Fix Applied:
Verify firmware version has changed from 1.0.0.3(4687) to a newer version. Test by attempting to access /goform/apPortalAuth with long input parameters.📡 Detection & Monitoring
Log Indicators:
- Unusually long webUserName or webUserPassword parameters in web logs
- Multiple failed authentication attempts to /goform/apPortalAuth
- Router reboot events following web portal access
Network Indicators:
- HTTP POST requests to /goform/apPortalAuth with payloads exceeding normal length
- Unusual outbound connections from router IP
SIEM Query:
source="router_logs" AND (uri_path="/goform/apPortalAuth" AND (param_length>100 OR status_code=500))