CVE-2021-3616
📋 TL;DR
This vulnerability in Lenovo Smart Camera models X3, X5, and C2E allows unauthorized users to access device information, modify firmware, and change device configurations. It affects users of these specific camera models who have not applied security updates. The vulnerability stems from improper authorization controls.
💻 Affected Systems
- Lenovo Smart Camera X3
- Lenovo Smart Camera X5
- Lenovo Smart Camera C2E
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
An attacker could completely compromise the camera, install malicious firmware, use it as an entry point to the network, or disable security features to enable surveillance.
Likely Case
Unauthorized access to camera feeds, device tampering, or configuration changes that compromise privacy and security.
If Mitigated
Limited impact with proper network segmentation and updated firmware, though some information exposure might still occur.
🎯 Exploit Status
Exploitation likely requires network access to the camera; no authentication needed based on CWE-285 (Improper Authorization).
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Lenovo advisory for specific firmware versions
Vendor Advisory: https://iknow.lenovo.com.cn/detail/dc_198417.html
Restart Required: Yes
Instructions:
1. Access the Lenovo Smart Camera management interface. 2. Check for firmware updates in the settings. 3. Download and apply the latest firmware from Lenovo. 4. Reboot the camera after update.
🔧 Temporary Workarounds
Network Segmentation
allIsolate cameras on a separate VLAN to limit access from untrusted networks.
Disable Remote Access
allTurn off any cloud or remote management features if not needed.
🧯 If You Can't Patch
- Disconnect cameras from the internet and place them on an isolated network segment.
- Implement strict firewall rules to block all inbound traffic to camera IPs except from management stations.
🔍 How to Verify
Check if Vulnerable:
Check firmware version in camera web interface; compare with patched versions in Lenovo advisory.Check Version:
Access camera web interface > Settings > About or System Info to view firmware version.Verify Fix Applied:
Confirm firmware version matches or exceeds the patched version listed in the advisory.📡 Detection & Monitoring
Log Indicators:
- Unauthorized access attempts in camera logs
- Unexpected firmware update or configuration changes
Network Indicators:
- Unusual outbound connections from camera
- Traffic to/from camera on non-standard ports
SIEM Query:
source="camera_logs" AND (event="unauthorized_access" OR event="firmware_change")