CVE-2022-27286
📋 TL;DR
This vulnerability is a stack overflow in D-Link DIR-619 Ax routers that allows attackers to cause a Denial of Service (DoS) by sending specially crafted requests to the formSetWanNonLogin function. It affects users of D-Link DIR-619 Ax routers running firmware version 1.00. Attackers can exploit this remotely without authentication.
💻 Affected Systems
- D-Link DIR-619 Ax
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete router crash requiring physical reboot, potential remote code execution if combined with other vulnerabilities, and persistent network disruption.
Likely Case
Router becomes unresponsive, requiring manual reboot to restore functionality, causing temporary network outage.
If Mitigated
Minimal impact with proper network segmentation and firewall rules blocking external access to router management interface.
🎯 Exploit Status
Proof of concept available in GitHub repository. Exploitation requires sending crafted HTTP request to vulnerable endpoint.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor advisory for latest firmware
Vendor Advisory: https://www.dlink.com/en/security-bulletin/
Restart Required: Yes
Instructions:
1. Visit D-Link support site. 2. Download latest firmware for DIR-619 Ax. 3. Log into router web interface. 4. Navigate to firmware update section. 5. Upload and apply new firmware. 6. Reboot router.
🔧 Temporary Workarounds
Disable WAN Management
allPrevent external access to router management interface
Network Segmentation
allIsolate router management interface to trusted network segment
🧯 If You Can't Patch
- Block external access to router management interface (ports 80/443) at firewall
- Implement network monitoring for abnormal HTTP requests to router management interface
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in web interface or via SSH if enabled. Version 1.00 is vulnerable.Check Version:
Check web interface System Status or use: curl -s http://router-ip/status.html | grep FirmwareVerify Fix Applied:
Verify firmware version is updated beyond v1.00. Test router stability under normal operation.📡 Detection & Monitoring
Log Indicators:
- Multiple HTTP POST requests to formSetWanNonLogin with malformed curTime parameter
- Router reboot logs without user action
- High CPU/memory usage spikes
Network Indicators:
- HTTP requests with unusually long curTime parameter values
- Traffic to router management interface from unexpected sources
SIEM Query:
source="router.log" AND ("formSetWanNonLogin" OR "curTime") AND (content_length>1000 OR status=500)