CVE-2024-7582
📋 TL;DR
A critical buffer overflow vulnerability in Tenda i22 routers allows remote attackers to execute arbitrary code by sending specially crafted requests to the /goform/apPortalAccessCodeAuth endpoint. This affects Tenda i22 router users running firmware version 1.0.0.3(4687). Attackers can exploit this without authentication to potentially take full control of affected devices.
💻 Affected Systems
- Tenda i22
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, lateral movement to internal networks, persistent backdoor installation, and data exfiltration.
Likely Case
Device takeover enabling network traffic interception, DNS hijacking, credential theft, and participation in botnets.
If Mitigated
Limited impact if devices are behind firewalls with strict inbound filtering and network segmentation.
🎯 Exploit Status
Public exploit code is available on GitHub. The vulnerability requires no authentication and has straightforward exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: Yes
Instructions:
1. Check Tenda website for firmware updates. 2. If update available, download and install via router admin interface. 3. Reboot router after update. 4. Verify firmware version changed from 1.0.0.3(4687).
🔧 Temporary Workarounds
Network Access Control
linuxBlock external access to router web interface using firewall rules
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
Endpoint Disable
allDisable the vulnerable apPortalAccessCodeAuth functionality if possible
🧯 If You Can't Patch
- Isolate affected routers in separate VLAN with strict firewall rules
- Implement network monitoring for exploit attempts and anomalous traffic patterns
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via admin interface. If version is 1.0.0.3(4687), device is vulnerable.Check Version:
curl -s http://router-ip/login/Auth | grep firmware version or check admin interfaceVerify Fix Applied:
Verify firmware version has changed from 1.0.0.3(4687) to a newer version.📡 Detection & Monitoring
Log Indicators:
- HTTP POST requests to /goform/apPortalAccessCodeAuth with long parameter values
- Router crash/restart logs
- Unusual process execution in router logs
Network Indicators:
- HTTP traffic to router IP on port 80/443 with POST to vulnerable endpoint
- Unusual outbound connections from router
SIEM Query:
source="router_logs" AND (url="/goform/apPortalAccessCodeAuth" OR message="buffer overflow" OR message="crash")