CVE-2024-9908
📋 TL;DR
A critical buffer overflow vulnerability in D-Link DIR-619L B1 router's formSetMACFilter function allows attackers to execute arbitrary code by manipulating the curTime parameter. This affects all users of the vulnerable firmware version. Successful exploitation could lead to complete device compromise.
💻 Affected Systems
- D-Link DIR-619L B1
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to full router compromise, credential theft, network traffic interception, and lateral movement into connected networks.
Likely Case
Router crash/reboot causing denial of service, or limited code execution allowing attacker persistence on the device.
If Mitigated
No impact if device is not internet-facing and has strict network access controls.
🎯 Exploit Status
Public exploit code is available, making exploitation straightforward for attackers with basic skills.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.dlink.com/
Restart Required: Yes
Instructions:
1. Check D-Link website for firmware updates. 2. If update available, download and install via router web interface. 3. Reboot router after update.
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to router administration interface
Network Segmentation
allIsolate router management interface to trusted network segment only
🧯 If You Can't Patch
- Replace vulnerable device with supported model
- Implement strict firewall rules blocking all external access to router management interface
🔍 How to Verify
Check if Vulnerable:
Access router web interface, navigate to System Info or Status page, check firmware version.Check Version:
curl -s http://router-ip/status.asp | grep -i firmwareVerify Fix Applied:
Verify firmware version is no longer 2.06 after update.📡 Detection & Monitoring
Log Indicators:
- Multiple failed POST requests to /goform/formSetMACFilter
- Router reboot logs without user action
- Unusual outbound connections from router
Network Indicators:
- HTTP POST requests to /goform/formSetMACFilter with long curTime parameters
- Unusual traffic patterns from router IP
SIEM Query:
source="router.log" AND (url="/goform/formSetMACFilter" OR "buffer overflow" OR "segmentation fault")