CVE-2023-34551
📋 TL;DR
This vulnerability allows an authenticated attacker on the same local network as affected EZVIZ security cameras to execute arbitrary code via stack buffer overflows in the network configuration function. The attacker must have valid credentials and local network access to exploit the flaw. This affects multiple EZVIZ camera models with outdated firmware.
💻 Affected Systems
- EZVIZ CS-C6N-B0-1G2WF
- EZVIZ CS-C6N-R101-1G2WF
- EZVIZ CS-CV310-A0-1B2WFR
- EZVIZ CS-CV310-A0-1C2WFR-C
- EZVIZ CS-C6N-A0-1C2WFR-MUL
- EZVIZ CS-CV310-A0-3C2WFRL-1080p
- EZVIZ CS-CV310-A0-1C2WFR Wifi IP66 2.8mm 1080p
- EZVIZ CS-CV248-A0-32WMFR
- EZVIZ LC1C
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the camera device leading to persistent access, lateral movement to other network devices, data exfiltration, or participation in botnets.
Likely Case
Unauthorized access to camera feeds, device manipulation, or denial of service against the camera.
If Mitigated
Limited impact due to network segmentation and strong authentication controls preventing attacker access.
🎯 Exploit Status
Requires authenticated access to the camera's network services and knowledge of the vulnerable function. Stack buffer overflows typically require some exploitation skill.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Varies by model - see CVE description for specific fixed versions (generally V5.3.0 or V5.3.2 builds from February/March 2023)
Vendor Advisory: https://www.ezviz.com/data-security/security-notice/detail/827
Restart Required: Yes
Instructions:
1. Log into EZVIZ camera web interface or mobile app. 2. Navigate to Settings > System > Firmware Update. 3. Check for available updates. 4. If no update appears, download latest firmware from EZVIZ website. 5. Upload firmware file manually. 6. Camera will restart automatically after update.
🔧 Temporary Workarounds
Network Segmentation
allIsolate cameras on separate VLAN without internet access
Access Control
allChange default credentials and implement strong authentication
🧯 If You Can't Patch
- Segment cameras on isolated network without internet access
- Implement strict firewall rules to limit camera communication to necessary services only
🔍 How to Verify
Check if Vulnerable:
Check firmware version in camera web interface or mobile app against affected versions listed in CVECheck Version:
No universal command - check via camera web interface or mobile app settingsVerify Fix Applied:
Confirm firmware version matches or exceeds patched versions specified in CVE description📡 Detection & Monitoring
Log Indicators:
- Multiple failed authentication attempts followed by network configuration changes
- Unusual process execution on camera device
Network Indicators:
- Unusual network traffic to/from camera on non-standard ports
- Multiple connection attempts to camera management interface
SIEM Query:
source="camera_logs" AND (event="authentication_failure" OR event="config_change") | stats count by src_ip