CVE-2023-44830
📋 TL;DR
A buffer overflow vulnerability in D-Link DIR-823G routers allows attackers to cause Denial of Service (DoS) by sending crafted input to the EndTime parameter in the SetParentsControlInfo function. This affects D-Link DIR-823G A1V1.0.2B05 firmware users. Attackers can crash the device, disrupting network connectivity.
💻 Affected Systems
- D-Link DIR-823G
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device crash requiring physical reboot, persistent network disruption, potential remote code execution if buffer overflow can be leveraged further
Likely Case
Temporary DoS causing network outage until device reboots
If Mitigated
Minimal impact if device is patched or network segmentation prevents access
🎯 Exploit Status
Public proof-of-concept available, exploitation requires sending crafted HTTP request to vulnerable endpoint
🛠️ 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 site 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. Reboot router
🔧 Temporary Workarounds
Disable Parental Control Feature
allDisable the vulnerable SetParentsControlInfo function if not needed
Login to router admin panel → Advanced → Parental Controls → Disable
Network Segmentation
allPlace router behind firewall to restrict access to management interface
🧯 If You Can't Patch
- Replace vulnerable device with updated model or different vendor
- Implement strict network access controls to limit who can reach router management interface
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface under Maintenance → FirmwareCheck Version:
Login to router web interface and navigate to firmware information pageVerify Fix Applied:
Confirm firmware version is updated beyond A1V1.0.2B05 and test parental control functionality📡 Detection & Monitoring
Log Indicators:
- Multiple malformed HTTP requests to SetParentsControlInfo endpoint
- Router crash/reboot logs
- Unusual traffic to router management port
Network Indicators:
- HTTP POST requests with long EndTime parameters to router IP
- Traffic spikes to port 80/443 of router
SIEM Query:
source_ip="router_ip" AND (uri="*SetParentsControlInfo*" OR http_user_agent="*malicious*" OR http_content_length>1000)