CVE-2017-18848
📋 TL;DR
This CVE describes a Cross-Site Request Forgery (CSRF) vulnerability in specific NETGEAR router models. Attackers can trick authenticated users into performing unauthorized actions on their router's web interface. Affected users include those running vulnerable firmware versions on R6300v2, AC1450, R7300, and R8500 routers.
💻 Affected Systems
- NETGEAR R6300v2
- NETGEAR AC1450
- NETGEAR R7300
- NETGEAR R8500
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
An attacker could change router settings, enable remote administration, redirect DNS, or potentially compromise the entire network by tricking an authenticated user into visiting a malicious webpage.
Likely Case
Attackers could modify router configurations like DNS settings, firewall rules, or admin credentials, leading to man-in-the-middle attacks or network disruption.
If Mitigated
With proper CSRF protections and user awareness, the risk is significantly reduced as the attack requires user interaction while authenticated.
🎯 Exploit Status
CSRF attacks are well-understood and easy to implement. Exploitation requires the victim to be authenticated to the router's web interface and visit a malicious webpage.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: R6300v2: 1.0.0.36+, AC1450: 1.0.0.36+, R7300: 1.0.0.54+, R8500: 1.0.2.94+
Vendor Advisory: https://kb.netgear.com/000049011/Security-Advisory-for-Cross-Site-Request-Forgery-on-Some-Routers-PSV-2017-0334
Restart Required: Yes
Instructions:
1. Log into router web interface. 2. Navigate to Advanced > Administration > Firmware Update. 3. Check for updates or manually download from NETGEAR support site. 4. Upload and install the firmware update. 5. Router will reboot automatically.
🔧 Temporary Workarounds
Disable Remote Management
allPrevents external access to router web interface, reducing attack surface.
Use Browser CSRF Protection
allEnable browser extensions that block CSRF attempts or use private browsing sessions for router administration.
🧯 If You Can't Patch
- Segment router management interface to isolated network segment
- Implement strict access controls and monitor for unauthorized configuration changes
🔍 How to Verify
Check if Vulnerable:
Access router web interface > Advanced > Administration > Firmware Update > check current version against vulnerable ranges.Check Version:
Check via web interface or use 'curl http://routerip/currentsetting.htm' if availableVerify Fix Applied:
Confirm firmware version matches or exceeds patched versions: R6300v2: 1.0.0.36+, AC1450: 1.0.0.36+, R7300: 1.0.0.54+, R8500: 1.0.2.94+📡 Detection & Monitoring
Log Indicators:
- Unexpected configuration changes in router logs
- Multiple failed login attempts followed by successful changes
Network Indicators:
- Unusual outbound traffic patterns after router configuration changes
- DNS queries to unexpected servers
SIEM Query:
source="router_logs" AND (event="configuration_change" OR event="admin_login") FROM authenticated_user_ip NOT IN allowed_admin_ips