CVE-2023-38925
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on affected Netgear devices via a buffer overflow in the password.cgi script. Attackers can exploit the http_passwd parameter to gain control of the device. Users of Netgear DC112A, EX6200, and R6300v2 routers with vulnerable firmware versions are affected.
💻 Affected Systems
- Netgear DC112A
- Netgear EX6200
- Netgear R6300v2
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise leading to persistent remote access, network infiltration, data theft, and use as a botnet node.
Likely Case
Remote code execution allowing attackers to modify device settings, intercept traffic, or install malware.
If Mitigated
Limited impact if devices are behind firewalls with restricted web interface access and proper network segmentation.
🎯 Exploit Status
Public proof-of-concept code exists in the GitHub repository. The buffer overflow can be triggered without authentication via HTTP requests to the vulnerable endpoint.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Netgear security advisories for updated firmware versions
Vendor Advisory: https://www.netgear.com/about/security/
Restart Required: Yes
Instructions:
1. Visit Netgear support website. 2. Download latest firmware for your device model. 3. Log into router admin interface. 4. Navigate to firmware update section. 5. Upload and install new firmware. 6. Reboot device.
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to the web administration interface
Log into router admin > Advanced > Remote Management > Disable
Restrict Web Interface Access
allLimit access to the admin interface to trusted IP addresses only
Log into router admin > Security > Access Control > Add allowed IPs
🧯 If You Can't Patch
- Isolate affected devices in separate network segments with strict firewall rules
- Disable the web administration interface entirely if not needed
🔍 How to Verify
Check if Vulnerable:
Check current firmware version in router admin interface under Advanced > Administration > Router UpdateCheck Version:
Log into router web interface and navigate to firmware information pageVerify Fix Applied:
Verify firmware version matches or exceeds patched versions from Netgear security advisory📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP POST requests to password.cgi with long http_passwd parameters
- Multiple failed authentication attempts followed by buffer overflow patterns
Network Indicators:
- HTTP traffic to router IP on port 80/443 with abnormal payload sizes in POST requests
- Unexpected outbound connections from router after exploitation
SIEM Query:
source="router_logs" AND (uri="/password.cgi" AND http_method="POST" AND content_length>1000)