CVE-2023-44834
📋 TL;DR
This vulnerability in D-Link DIR-823G routers allows attackers to trigger a buffer overflow via the StartTime parameter in the SetParentsControlInfo function. Exploitation can cause Denial of Service (DoS) by crashing the device. Only users of the specific D-Link DIR-823G A1V1.0.2B05 firmware are affected.
💻 Affected Systems
- D-Link DIR-823G
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device crash requiring physical reset, potentially leading to extended network downtime and service disruption.
Likely Case
Temporary DoS requiring device reboot, disrupting network connectivity for connected devices.
If Mitigated
Minimal impact with proper network segmentation and access controls limiting exposure.
🎯 Exploit Status
Public proof-of-concept code exists in GitHub repositories. The vulnerability appears to be exploitable without authentication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check D-Link security bulletin for latest patched version
Vendor Advisory: https://www.dlink.com/en/security-bulletin/
Restart Required: Yes
Instructions:
1. Visit D-Link support website 2. Download latest firmware for DIR-823G 3. Log into router admin interface 4. Navigate to firmware update section 5. Upload and apply new firmware 6. Wait for automatic restart
🔧 Temporary Workarounds
Disable Parental Control Feature
allDisable the Parental Control functionality that contains the vulnerable SetParentsControlInfo function
Log into router admin interface and disable Parental Control settings
Restrict Administrative Access
allLimit administrative interface access to trusted internal IP addresses only
Configure firewall rules to restrict access to router admin interface (typically port 80/443)
🧯 If You Can't Patch
- Segment router on isolated network segment with strict firewall rules
- Implement network monitoring for abnormal traffic patterns to router administrative interface
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface under System or Maintenance sectionCheck Version:
Log into router web interface and navigate to System Information or Firmware Update sectionVerify Fix Applied:
Verify firmware version matches or exceeds patched version from D-Link advisory📡 Detection & Monitoring
Log Indicators:
- Multiple failed authentication attempts to admin interface
- Unusual POST requests to SetParentsControlInfo endpoint
- Router crash/reboot logs
Network Indicators:
- Abnormal HTTP traffic to router port 80/443 with crafted StartTime parameters
- Sudden loss of connectivity to router
SIEM Query:
source="router_logs" AND ("SetParentsControlInfo" OR "StartTime" OR "buffer overflow")