CVE-2023-41199
📋 TL;DR
This vulnerability allows network-adjacent attackers to execute arbitrary commands as root on D-Link DAP-1325 routers without authentication. Attackers can inject malicious commands through the StaticDNS2 parameter in HNAP1 SOAP requests, leading to complete system compromise. All users of affected DAP-1325 routers are at risk.
💻 Affected Systems
- D-Link DAP-1325
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete router takeover with root privileges, allowing attackers to intercept all network traffic, install persistent malware, pivot to internal networks, and brick the device.
Likely Case
Router compromise leading to network traffic interception, credential theft, DNS hijacking, and installation of backdoors for persistent access.
If Mitigated
Limited impact if device is isolated from untrusted networks, though local attackers could still exploit if they gain network access.
🎯 Exploit Status
Exploit requires network adjacency but no authentication. ZDI has published technical details and proof-of-concept.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Firmware version 1.11B02
Vendor Advisory: https://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10351
Restart Required: Yes
Instructions:
1. Download firmware version 1.11B02 from D-Link support site. 2. Log into router admin interface. 3. Navigate to Firmware Update section. 4. Upload and apply the new firmware. 5. Wait for automatic reboot.
🔧 Temporary Workarounds
Disable HNAP1 Service
allDisable the vulnerable HNAP1 SOAP endpoint if not required
Not available - requires firmware modification
Network Segmentation
allIsolate DAP-1325 from untrusted networks and limit access to trusted devices only
🧯 If You Can't Patch
- Replace affected DAP-1325 routers with patched or alternative models
- Implement strict network access controls to limit who can reach the router's management interface
🔍 How to Verify
Check if Vulnerable:
Check firmware version via router web interface or by accessing http://router-ip/HNAP1/ and comparing version stringsCheck Version:
curl -s http://router-ip/HNAP1/ | grep -i versionVerify Fix Applied:
Verify firmware version is 1.11B02 or later in router admin interface📡 Detection & Monitoring
Log Indicators:
- Unusual HNAP1 SOAP requests with shell metacharacters in parameters
- Failed command execution attempts in system logs
Network Indicators:
- POST requests to /HNAP1/ with suspicious StaticDNS2 parameter values
- Unusual outbound connections from router
SIEM Query:
source="router_logs" AND (uri_path="/HNAP1/" AND (param="StaticDNS2" AND value MATCHES "[;&|`$()]"))