CVE-2022-43624
📋 TL;DR
This vulnerability allows network-adjacent attackers to execute arbitrary code as root on D-Link DIR-1935 routers by bypassing authentication and exploiting improper input validation in IPv6 static route handling. Attackers can gain complete control of affected routers. Only D-Link DIR-1935 routers with firmware version 1.03 are affected.
💻 Affected Systems
- D-Link DIR-1935
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete router compromise allowing attackers to intercept all network traffic, install persistent malware, pivot to internal networks, and use the router for botnet activities.
Likely Case
Router takeover leading to DNS hijacking, credential theft from network traffic, and installation of backdoors for persistent access.
If Mitigated
Limited impact if routers are isolated from critical networks and have strict network segmentation.
🎯 Exploit Status
Exploit requires network access and authentication bypass, but detailed technical information is publicly available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.04 or later
Vendor Advisory: https://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10310
Restart Required: Yes
Instructions:
1. Log into router web interface. 2. Navigate to Firmware Update section. 3. Download firmware version 1.04 or later from D-Link support site. 4. Upload and apply the firmware update. 5. Reboot router after update completes.
🔧 Temporary Workarounds
Disable IPv6 Static Routes
allRemove or disable IPv6 static route configuration if not needed
Restrict Web Management Access
allLimit web management portal access to specific trusted IP addresses only
🧯 If You Can't Patch
- Isolate affected routers in separate VLAN with no access to critical internal resources
- Implement network monitoring for suspicious traffic patterns from router to internal systems
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface: System > Firmware Update > Current Firmware VersionCheck Version:
Not applicable - use web interfaceVerify Fix Applied:
Verify firmware version shows 1.04 or later after update📡 Detection & Monitoring
Log Indicators:
- Unusual authentication attempts to web interface
- Unexpected system command execution in router logs
- Multiple failed SetStaticRouteIPv6Settings requests
Network Indicators:
- Suspicious outbound connections from router to unknown IPs
- Unusual traffic patterns from router management interface
SIEM Query:
source="router_logs" AND ("SetStaticRouteIPv6Settings" OR "authentication bypass" OR "root shell")