CVE-2022-45460
📋 TL;DR
This critical vulnerability allows unauthenticated remote attackers to execute arbitrary code on affected Xiongmai NVR devices by sending a specially crafted HTTP request with a long URI. Attackers can exploit a stack-based buffer overflow to crash the web server, reboot the system, and gain full control. Organizations using Xiongmai NVR models MBD6304T and NBD6808T-PL with specific firmware versions are affected.
💻 Affected Systems
- Xiongmai MBD6304T
- Xiongmai NBD6808T-PL
📦 What is this software?
Mbd6304t Firmware by Xiongmaitech
Nbd6808t Pl Firmware by Xiongmaitech
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attackers to execute arbitrary code, install persistent malware, access video feeds, pivot to internal networks, and maintain persistent access.
Likely Case
Remote code execution leading to system compromise, data exfiltration, and potential ransomware deployment on vulnerable NVR systems.
If Mitigated
Denial of service through system reboot if exploit fails to achieve code execution, but system remains vulnerable to subsequent attacks.
🎯 Exploit Status
Public exploit code is available on GitHub, making exploitation trivial for attackers with basic skills.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: No official vendor advisory found
Restart Required: Yes
Instructions:
1. Contact Xiongmai support for firmware updates. 2. If updates are available, download from official sources. 3. Backup configuration. 4. Apply firmware update via web interface. 5. Reboot device. 6. Verify update applied successfully.
🔧 Temporary Workarounds
Network Segmentation
linuxIsolate NVR devices from internet and restrict internal network access
iptables -A INPUT -s 0.0.0.0/0 -p tcp --dport 80 -j DROP
iptables -A INPUT -s 0.0.0.0/0 -p tcp --dport 443 -j DROP
Web Interface Disable
linuxDisable web interface if not required for operations
service httpd stop
chkconfig httpd off
🧯 If You Can't Patch
- Implement strict network access controls allowing only trusted IP addresses to access NVR management interface
- Deploy web application firewall (WAF) with buffer overflow protection rules in front of NVR devices
🔍 How to Verify
Check if Vulnerable:
Check device firmware version via web interface at System > Information > Version. If version matches affected range, device is vulnerable.Check Version:
curl -s http://[NVR_IP]/cgi-bin/version.cgi | grep FirmwareVerify Fix Applied:
Verify firmware version has been updated to a version not in the affected range. Test with controlled exploit attempt from isolated test system.📡 Detection & Monitoring
Log Indicators:
- Web server crash logs
- System reboot events
- HTTP requests with unusually long URIs (>1000 characters)
- Multiple failed web service restarts
Network Indicators:
- HTTP GET requests with extremely long URI paths
- Traffic patterns showing buffer overflow attempts
- Unusual outbound connections from NVR devices
SIEM Query:
source="*nvr*" AND (uri_length>1000 OR "sprintf" IN message OR "buffer overflow" IN message OR "segmentation fault" IN message)