CVE-2024-35099
📋 TL;DR
This vulnerability is a stack overflow in the TOTOLINK LR350 router's loginAuth function, allowing remote attackers to execute arbitrary code by sending a specially crafted password parameter. It affects TOTOLINK LR350 routers running firmware version V9.3.5u.6698_B20230810. Attackers can potentially gain full control of affected devices.
💻 Affected Systems
- TOTOLINK LR350
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, credential theft, network pivoting, and persistent backdoor installation.
Likely Case
Remote code execution allowing attackers to modify router settings, intercept traffic, or use the device as a botnet node.
If Mitigated
Limited impact if devices are behind firewalls with strict ingress filtering and network segmentation.
🎯 Exploit Status
Exploit details are publicly available in GitHub repositories. The vulnerability is in the login function, making exploitation straightforward.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: Yes
Instructions:
1. Check TOTOLINK website for firmware updates. 2. Download latest firmware. 3. Upload via web interface. 4. Reboot router.
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to the web management interface.
Access router settings > Administration > Remote Management > Disable
Network Segmentation
allIsolate affected routers from critical network segments.
🧯 If You Can't Patch
- Implement strict network access controls to limit access to router management interface
- Monitor network traffic for unusual patterns or exploit attempts
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router web interface: System > Status > Firmware VersionCheck Version:
curl -s http://router-ip/cgi-bin/luci/ | grep -i versionVerify Fix Applied:
Verify firmware version is newer than V9.3.5u.6698_B20230810📡 Detection & Monitoring
Log Indicators:
- Unusual login attempts with long password strings
- System crash or reboot logs
Network Indicators:
- HTTP POST requests to login endpoint with unusually long password parameters
- Traffic patterns suggesting exploit delivery
SIEM Query:
source="router_logs" AND (event="login_failed" AND password_length>100) OR event="system_reboot"