CVE-2023-42320
📋 TL;DR
A buffer overflow vulnerability in Tenda AC10V4 routers allows remote attackers to cause denial of service by sending specially crafted requests to the GetParentControlInfo function. This affects Tenda AC10V4 routers running vulnerable firmware versions, potentially disrupting network connectivity for affected devices.
💻 Affected Systems
- Tenda AC10V4
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, persistent backdoor installation, or bricking of the router requiring hardware replacement.
Likely Case
Denial of service causing router crash and network disruption until manual reboot, potentially with configuration loss.
If Mitigated
Limited impact if device is behind firewall with restricted WAN access, though internal network attacks remain possible.
🎯 Exploit Status
Public GitHub repository contains proof-of-concept code demonstrating the buffer overflow via the mac parameter.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: No official vendor advisory found
Restart Required: Yes
Instructions:
1. Check Tenda official website for firmware updates
2. If update available, download and install via router web interface
3. Reboot router after update
4. Verify firmware version is no longer vulnerable
🔧 Temporary Workarounds
Disable remote management
allPrevent external exploitation by disabling WAN access to router administration interface
Network segmentation
allIsolate router management interface to separate VLAN with restricted access
🧯 If You Can't Patch
- Replace vulnerable router with different model or manufacturer
- Place router behind dedicated firewall with strict inbound rules blocking all unnecessary ports
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in web interface under System Status or similar sectionCheck Version:
Check via router web interface or SSH if enabled: cat /proc/version or similar firmware info commandVerify Fix Applied:
Confirm firmware version has changed from vulnerable version after update📡 Detection & Monitoring
Log Indicators:
- Repeated router crashes/reboots
- Unusual requests to GetParentControlInfo endpoint
- Large payloads in HTTP requests to router
Network Indicators:
- Unusual traffic patterns to router management interface
- Multiple connection attempts to router web interface from single source
SIEM Query:
source="router_logs" AND ("GetParentControlInfo" OR "mac=" AND content_length>100)