CVE-2024-7465
📋 TL;DR
A critical buffer overflow vulnerability in TOTOLINK CP450 routers allows remote attackers to execute arbitrary code by manipulating the http_host parameter in the loginauth function. This affects TOTOLINK CP450 routers running firmware version 4.1.0cu.747_B20191224. Attackers can exploit this without authentication to potentially take full control of affected devices.
💻 Affected Systems
- TOTOLINK CP450
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, creation of persistent backdoors, lateral movement to internal networks, and botnet recruitment.
Likely Case
Device takeover enabling traffic interception, credential theft, and use as pivot point for internal network attacks.
If Mitigated
Limited impact if devices are isolated in separate VLANs with strict network segmentation and egress filtering.
🎯 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: No
Instructions:
No official patch is available. The vendor did not respond to disclosure. Consider replacing affected devices or implementing workarounds.
🔧 Temporary Workarounds
Network Segmentation
allIsolate TOTOLINK CP450 devices in separate VLANs with strict firewall rules to prevent external access.
Disable Web Interface
allDisable the web management interface if not required, or restrict access to specific management IP addresses only.
🧯 If You Can't Patch
- Immediately remove affected devices from internet-facing positions and place behind firewalls with strict ingress filtering.
- Implement network monitoring for unusual traffic patterns or exploit attempts targeting the /cgi-bin/cstecgi.cgi endpoint.
🔍 How to Verify
Check if Vulnerable:
Check firmware version via web interface at http://device-ip/ or via SSH if enabled. Look for version 4.1.0cu.747_B20191224.Check Version:
curl -s http://device-ip/ | grep -i firmware || ssh admin@device-ip 'cat /etc/version'Verify Fix Applied:
Since no patch exists, verify workarounds by testing that web interface is inaccessible from untrusted networks and monitoring for exploit attempts.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /cgi-bin/cstecgi.cgi with manipulated http_host parameters
- Buffer overflow errors in system logs
Network Indicators:
- Exploit traffic patterns matching public PoC
- Unexpected connections from router to external IPs
SIEM Query:
source="router_logs" AND uri="/cgi-bin/cstecgi.cgi" AND (http_host.length>100 OR contains(http_host, "\x90"))