CVE-2024-0920
📋 TL;DR
This critical vulnerability in TRENDnet TEW-822DRE routers allows remote attackers to execute arbitrary commands via command injection in the ping functionality. Attackers can exploit this by sending specially crafted POST requests to the /admin_ping.htm endpoint, potentially gaining full control of affected devices. All users of vulnerable TRENDnet TEW-822DRE routers are affected.
💻 Affected Systems
- TRENDnet TEW-822DRE
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the router allowing attackers to intercept network traffic, pivot to internal networks, install persistent malware, or brick the device.
Likely Case
Attackers gain shell access to the router, enabling them to modify configurations, steal credentials, or use the device as a foothold for further attacks.
If Mitigated
If properly segmented and monitored, impact is limited to the router itself with no lateral movement to other systems.
🎯 Exploit Status
Exploit requires authentication to the admin interface. The vulnerability is in the POST request handler for ping functionality, allowing command injection via ipv4_ping/ipv6_ping parameters.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available - vendor did not respond to disclosure
Restart Required: No
Instructions:
No official patch is available. Consider the workarounds and risk reduction steps below.
🔧 Temporary Workarounds
Disable web administration interface
allDisable the web administration interface to prevent exploitation of this vulnerability
Access router CLI via SSH/Telnet and disable web interface: 'no service web' or similar command
Restrict admin interface access
allLimit access to the admin interface to specific trusted IP addresses only
Configure firewall rules to only allow admin access from specific management IPs
🧯 If You Can't Patch
- Segment the router on an isolated network segment with strict firewall rules
- Implement network monitoring for suspicious POST requests to /admin_ping.htm
🔍 How to Verify
Check if Vulnerable:
Check if your router model is TRENDnet TEW-822DRE and firmware version is 1.03B02 via the web interface or CLICheck Version:
Login to router web interface and check System Status or use CLI command 'show version'Verify Fix Applied:
No official fix available to verify. Monitor vendor website for firmware updates.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /admin_ping.htm with shell metacharacters in parameters
- Multiple failed login attempts followed by successful login and ping commands
Network Indicators:
- POST requests to /admin_ping.htm containing pipe characters, semicolons, or backticks in ipv4_ping/ipv6_ping parameters
- Outbound connections from router to unexpected destinations
SIEM Query:
http.method:POST AND http.uri:"/admin_ping.htm" AND (http.param.ipv4_ping:*|* OR http.param.ipv6_ping:*|* OR http.param.ipv4_ping:*;* OR http.param.ipv6_ping:*;*)