CVE-2024-33771
📋 TL;DR
A buffer overflow vulnerability in the D-Link DIR-619L Rev.B router's web interface allows authenticated remote attackers to cause a denial of service by sending specially crafted requests. This affects users of the specific router model and firmware version who have web administration enabled.
💻 Affected Systems
- D-Link DIR-619L Rev.B
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete router crash requiring physical reboot, potentially disrupting all network connectivity for connected devices.
Likely Case
Router becomes unresponsive to web administration, requiring reboot to restore functionality.
If Mitigated
Minimal impact if web administration is disabled or access is restricted to trusted networks only.
🎯 Exploit Status
Exploit requires authentication but is straightforward once credentials are obtained.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: Yes
Instructions:
1. Check D-Link support site for firmware updates. 2. If update available, download and upload via web interface. 3. Reboot router after update.
🔧 Temporary Workarounds
Disable Remote Web Administration
allPrevent external access to router web interface
Access router web interface > Advanced > Remote Management > Disable
Change Default Credentials
allUse strong, unique credentials to reduce authentication risk
Access router web interface > Tools > Admin > Change password
🧯 If You Can't Patch
- Restrict web interface access to specific trusted IP addresses only
- Disable WPS functionality if not needed
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in web interface under Tools > System > Firmware InformationCheck Version:
curl -s http://router-ip/status.cgi | grep FirmwareVerify Fix Applied:
Verify firmware version is no longer 2.06B1 after update📡 Detection & Monitoring
Log Indicators:
- Multiple failed authentication attempts followed by successful login and POST requests to /goform/formWPS
Network Indicators:
- Unusual POST requests to router IP on port 80/443 with 'webpage' parameter
SIEM Query:
source="router.log" AND (uri="/goform/formWPS" OR parameter="webpage")