CVE-2024-39950
📋 TL;DR
This vulnerability in Dahua products allows attackers to send specially crafted packets to vulnerable interfaces, triggering device initialization/reset. This affects Dahua security cameras, NVRs, and other IoT devices. Attackers could potentially disrupt device functionality or gain unauthorized access.
💻 Affected Systems
- Dahua security cameras
- Dahua NVRs
- Dahua DVRs
- Dahua network video recorders
📦 What is this software?
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Nvr4832 16p 4ks2\/i Firmware by Dahuasecurity
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise leading to persistent backdoor access, data exfiltration, or device becoming part of botnet
Likely Case
Device reset/reboot causing service disruption, temporary loss of surveillance coverage, or configuration loss
If Mitigated
Limited to denial of service if network segmentation prevents packet delivery
🎯 Exploit Status
CWE-121 indicates stack-based buffer overflow, suggesting relatively straightforward exploitation once packet format is understood
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Latest firmware versions from vendor
Vendor Advisory: https://www.dahuasecurity.com/aboutUs/trustedCenter/details/768
Restart Required: Yes
Instructions:
1. Visit Dahua Trust Center advisory 2. Identify affected product models 3. Download latest firmware from vendor portal 4. Follow vendor's firmware update procedure 5. Verify successful update
🔧 Temporary Workarounds
Network Segmentation
allIsolate Dahua devices from untrusted networks
Access Control Lists
linuxRestrict network access to Dahua device interfaces
iptables -A INPUT -p tcp --dport [DAHUA_PORT] -s [TRUSTED_NETWORK] -j ACCEPT
iptables -A INPUT -p tcp --dport [DAHUA_PORT] -j DROP
🧯 If You Can't Patch
- Implement strict network segmentation to isolate devices
- Deploy intrusion detection/prevention systems to monitor for exploit attempts
🔍 How to Verify
Check if Vulnerable:
Check device firmware version against vendor advisory. Devices running outdated firmware are vulnerable.Check Version:
Check via device web interface: System > Information > Version, or via SSH: cat /etc/versionVerify Fix Applied:
Verify firmware version matches patched version in vendor advisory and device functions normally after update📡 Detection & Monitoring
Log Indicators:
- Unexpected device reboots
- Initialization/reset events in system logs
- Failed firmware update attempts
Network Indicators:
- Unusual packets to device management ports
- Traffic patterns matching known exploit attempts
SIEM Query:
source="dahua-device" AND (event="reboot" OR event="reset" OR event="initialization")