CVE-2022-43626
📋 TL;DR
This vulnerability allows authenticated attackers on the same network to bypass authentication and execute arbitrary code with root privileges on D-Link DIR-1935 routers. The flaw exists in how the router processes firewall configuration requests, enabling command injection. Only users of affected D-Link router models with vulnerable firmware are impacted.
💻 Affected Systems
- D-Link DIR-1935
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attacker gains complete root control over the router, enabling traffic interception, network pivoting, malware deployment, and persistent backdoor installation.
Likely Case
Attacker compromises the router to redirect traffic, steal credentials, or join the device to a botnet.
If Mitigated
With proper network segmentation and access controls, impact is limited to the router itself without lateral movement.
🎯 Exploit Status
Exploit requires network access but authentication bypass makes exploitation straightforward. ZDI has published technical details.
🛠️ 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 firmware update. 5. Reboot router after update completes.
🔧 Temporary Workarounds
Disable Remote Management
allPrevents external access to web management interface
Network Segmentation
allIsolate router management interface to trusted VLAN
🧯 If You Can't Patch
- Replace router with supported model
- Implement strict firewall rules limiting access to router management interface
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router web interface under System > FirmwareCheck Version:
curl -s http://router-ip/status.html | grep 'Firmware Version'Verify Fix Applied:
Confirm firmware version is 1.04 or later in System > Firmware section📡 Detection & Monitoring
Log Indicators:
- Unusual SetIPv4FirewallSettings requests
- Multiple failed authentication attempts followed by successful access
- Suspicious command execution in system logs
Network Indicators:
- Unusual traffic to router management port (typically 80/443)
- POST requests to /goform/SetIPv4FirewallSettings with suspicious parameters
SIEM Query:
source="router_logs" AND ("SetIPv4FirewallSettings" OR "authentication bypass")