CVE-2022-24158
📋 TL;DR
CVE-2022-24158 is a stack overflow vulnerability in Tenda AX3 routers running firmware version 16.03.12.10_CN. Attackers can exploit this by sending specially crafted requests to the fromSetIpMacBind function, causing a Denial of Service (DoS) that crashes the router. This affects users of Tenda AX3 routers with the vulnerable firmware version.
💻 Affected Systems
- Tenda AX3
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete router crash requiring physical reboot, potentially disrupting all network connectivity for extended periods.
Likely Case
Router becomes unresponsive, requiring manual reboot to restore functionality.
If Mitigated
Minimal impact if router is behind firewall with restricted access to management interface.
🎯 Exploit Status
Public proof-of-concept code exists in GitHub repositories. Exploitation requires network access to router's management interface.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Later firmware versions from Tenda
Vendor Advisory: Not publicly documented by vendor
Restart Required: Yes
Instructions:
1. Log into router admin interface. 2. Navigate to firmware update section. 3. Download latest firmware from Tenda website. 4. Upload and install firmware update. 5. Reboot router after installation.
🔧 Temporary Workarounds
Restrict Management Interface Access
linuxBlock external access to router management interface using firewall rules.
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
Disable Remote Management
allTurn off remote management feature in router settings.
🧯 If You Can't Patch
- Isolate router on separate network segment with strict access controls
- Implement network monitoring for abnormal traffic patterns to router management interface
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface. If version is exactly 16.03.12.10_CN, the device is vulnerable.Check Version:
curl -s http://router-ip/status | grep version or check router web interfaceVerify Fix Applied:
Verify firmware version has been updated to a version later than 16.03.12.10_CN.📡 Detection & Monitoring
Log Indicators:
- Multiple failed connection attempts to router management interface
- Router crash/reboot logs
- Abnormal traffic patterns to fromSetIpMacBind endpoint
Network Indicators:
- Unusual HTTP POST requests to router management interface with large list parameters
- Sudden drop in router responsiveness
SIEM Query:
source="router.log" AND ("crash" OR "reboot" OR "fromSetIpMacBind")