CVE-2019-13394
📋 TL;DR
This vulnerability affects Voo-branded NETGEAR CG3700b routers running custom firmware V2.02.03, which use HTTP Basic Authentication over unencrypted HTTP connections. Attackers on the same network can intercept authentication credentials transmitted in cleartext, allowing unauthorized access to the router's administrative interface. This affects all users of these specific router models with the vulnerable firmware.
💻 Affected Systems
- Voo-branded NETGEAR CG3700b router
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers intercept administrative credentials, gain full control of the router, modify network settings, redirect traffic, install malware, or use the device as a pivot point into the internal network.
Likely Case
Local network attackers capture router admin credentials, change DNS settings to redirect users to malicious sites, or modify firewall rules to expose internal services.
If Mitigated
With proper network segmentation and monitoring, impact is limited to the compromised router itself, though attackers could still intercept credentials and access the admin interface.
🎯 Exploit Status
Exploitation requires being on the same network segment; tools like Wireshark or ettercap can capture credentials from HTTP traffic.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: No official vendor advisory found
Restart Required: No
Instructions:
No official patch available; contact Voo or NETGEAR for firmware updates or replacement options.
🔧 Temporary Workarounds
Force HTTPS Access
allConfigure router to only allow HTTPS access to the admin interface if supported
Network Segmentation
allIsolate router management interface on separate VLAN
🧯 If You Can't Patch
- Replace affected routers with models that support HTTPS for management
- Implement strict network access controls to limit who can reach the router's management interface
🔍 How to Verify
Check if Vulnerable:
Access router admin interface via HTTP (not HTTPS) and check if authentication is transmitted in cleartext using network monitoring toolsCheck Version:
Login to router admin interface and check firmware version in system settingsVerify Fix Applied:
Verify all management traffic uses HTTPS and no HTTP Basic Authentication is transmitted in cleartext📡 Detection & Monitoring
Log Indicators:
- Multiple failed login attempts
- Successful logins from unexpected IP addresses
- Configuration changes from unauthorized users
Network Indicators:
- HTTP traffic to router management port containing 'Authorization: Basic' headers
- Unencrypted authentication traffic to router IP
SIEM Query:
source_ip="router_ip" AND http.method="POST" AND http.uri="/login" AND NOT tls.version EXISTS