CVE-2022-29326
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on D-Link DIR-816 routers via a stack overflow in the addhostfilter parameter. Attackers can exploit this without authentication to gain full control of affected devices. Only D-Link DIR-816 A2 routers with specific firmware versions are affected.
💻 Affected Systems
- D-Link DIR-816 A2
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise leading to persistent backdoor installation, network traffic interception, lateral movement to other devices, and botnet recruitment.
Likely Case
Remote code execution allowing attackers to modify router settings, intercept traffic, or use the device as a pivot point for further attacks.
If Mitigated
Limited impact if device is behind firewall with restricted WAN access, though internal network attacks remain possible.
🎯 Exploit Status
Public exploit code exists in GitHub repositories. The vulnerability requires no authentication and has straightforward exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check D-Link security bulletin 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-816 A2. 3. Log into router admin interface. 4. Navigate to firmware update section. 5. Upload and apply new firmware. 6. Reboot router.
🔧 Temporary Workarounds
Disable Remote Management
allPrevents external exploitation by disabling WAN access to router admin interface
Network Segmentation
allIsolate router management interface to separate VLAN
🧯 If You Can't Patch
- Replace affected router with supported model
- Implement strict firewall rules blocking all WAN access to router management interface
🔍 How to Verify
Check if Vulnerable:
Check router web interface for firmware version v1.10CNB04 on DIR-816 A2 hardwareCheck Version:
Check router admin interface under System or Firmware sectionVerify Fix Applied:
Verify firmware version has been updated to a version later than v1.10CNB04📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/websHostFilter
- Multiple failed exploit attempts
- Unexpected configuration changes
Network Indicators:
- Unusual outbound connections from router
- Traffic patterns suggesting command and control
SIEM Query:
source="router_logs" AND uri="/goform/websHostFilter" AND method="POST"