CVE-2023-36357
📋 TL;DR
This vulnerability in TP-Link router web interface components allows attackers to cause denial of service via specially crafted GET requests. Affected users include anyone using vulnerable TP-Link router models with the web management interface accessible. The attack can render the router unresponsive, disrupting network connectivity.
💻 Affected Systems
- TP-Link TL-WR940N
- TP-Link TL-WR841N
- TP-Link TL-WR941ND
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Router becomes completely unresponsive, requiring physical power cycle and potentially causing extended network downtime for all connected devices.
Likely Case
Router web interface crashes or becomes unstable, disrupting administrative access and potentially affecting network stability until reboot.
If Mitigated
Limited to internal network impact with proper segmentation, or no impact if web interface is not exposed.
🎯 Exploit Status
Exploit requires simple HTTP GET request to specific endpoint. No authentication needed. Public GitHub repository contains proof-of-concept.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: No official TP-Link advisory found
Restart Required: No
Instructions:
Check TP-Link support website for firmware updates. If available, download latest firmware for your model and upload via web interface.
🔧 Temporary Workarounds
Disable Web Interface Access
allDisable remote web management and restrict local access
Access router admin panel → Security → Remote Management → Disable
Firewall rules to block port 80/443 to router IP
Network Segmentation
linuxIsolate router management interface from untrusted networks
iptables -A INPUT -s ! 192.168.1.0/24 -p tcp --dport 80 -j DROP
iptables -A INPUT -s ! 192.168.1.0/24 -p tcp --dport 443 -j DROP
🧯 If You Can't Patch
- Segment router management interface to trusted VLAN only
- Implement network monitoring for suspicious requests to /userRpm/LocalManageControlRpm
🔍 How to Verify
Check if Vulnerable:
Check router model and firmware version in web interface. If model/version matches affected list and web interface is accessible, assume vulnerable.Check Version:
curl -s http://[router-ip]/ | grep -i 'firmware version' or check web interface System Tools → Firmware UpgradeVerify Fix Applied:
Test with crafted GET request to http://[router-ip]/userRpm/LocalManageControlRpm. If router remains responsive, fix may be working.📡 Detection & Monitoring
Log Indicators:
- Multiple requests to /userRpm/LocalManageControlRpm
- Router reboot events
- Web interface crash logs
Network Indicators:
- HTTP GET requests to /userRpm/LocalManageControlRpm endpoint
- Unusual traffic patterns to router management IP
SIEM Query:
source="router.log" AND (uri="/userRpm/LocalManageControlRpm" OR event="web_interface_crash")