CVE-2017-18781
📋 TL;DR
This CVE describes a Cross-Site Request Forgery (CSRF) vulnerability in multiple NETGEAR router models. Attackers can trick authenticated users into performing unauthorized actions on their router's web interface. Affected users include anyone using the listed NETGEAR router models with vulnerable firmware versions.
💻 Affected Systems
- NETGEAR D6200
- D7000
- JNR1010v2
- JWNR2010v5
- JR6150
- PR2000
- R6020
- R6050
- R6080
- R6120
- R6220
- R6700v2
- R6800
- R6900v2
- WNDR3700v5
- WNR1000v4
- WNR2020
- WNR2050
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
An attacker could change router settings, redirect DNS, enable remote administration, or reset the device to factory defaults, potentially leading to network compromise or denial of service.
Likely Case
Attackers could modify router settings like DNS servers to redirect traffic to malicious sites, change Wi-Fi passwords, or disable security features.
If Mitigated
With proper CSRF protections and user awareness, the risk is significantly reduced as exploitation requires user interaction with malicious content while authenticated.
🎯 Exploit Status
Exploitation requires the victim to be authenticated to the router's web interface and visit a malicious webpage. CSRF attacks are well-understood and easy to implement.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions specified in the CVE description (e.g., D6200 1.1.00.24 or later)
Vendor Advisory: https://kb.netgear.com/000049538/Security-Advisory-for-Cross-Site-Request-Forgery-on-Some-Routers-PSV-2017-2954
Restart Required: Yes
Instructions:
1. Log into your NETGEAR router's web interface. 2. Navigate to the firmware update section. 3. Download the latest firmware from NETGEAR's support site. 4. Upload and install the firmware update. 5. Reboot the router after installation.
🔧 Temporary Workarounds
Use Incognito/Private Browsing for Admin
allAccess the router admin interface only in incognito or private browsing mode and close the session immediately after use to reduce CSRF risk.
Log Out After Admin Sessions
allAlways log out of the router admin interface after completing configuration changes.
🧯 If You Can't Patch
- Implement network segmentation to isolate the router management interface from general user traffic.
- Use browser extensions that block CSRF attempts or disable JavaScript for the router's IP address.
🔍 How to Verify
Check if Vulnerable:
Check your router's firmware version via the web interface and compare it against the patched versions listed in the CVE description.Check Version:
Log into router web interface and navigate to Advanced > Administration > Router Status or similar section to view firmware version.Verify Fix Applied:
After updating, verify the firmware version matches or exceeds the patched version specified by NETGEAR.📡 Detection & Monitoring
Log Indicators:
- Unexpected configuration changes in router logs
- Multiple failed login attempts followed by configuration changes
Network Indicators:
- Unusual DNS server changes
- Unexpected port forwarding rules
- Changes to remote management settings
SIEM Query:
Look for events where router configuration changes occur shortly after web requests from external IPs or unusual user agents.