CVE-2020-25784
📋 TL;DR
CVE-2020-25784 is an unauthenticated stack-based buffer overflow vulnerability in Accfly Wireless Security IR Camera System 720P. Attackers can remotely execute arbitrary code without authentication by sending specially crafted messages to vulnerable devices. This affects users of Accfly camera systems with vulnerable software versions.
💻 Affected Systems
- Accfly Wireless Security IR Camera System 720P
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attackers to execute arbitrary code, install malware, pivot to other network devices, or permanently disable the camera system.
Likely Case
Remote code execution leading to camera system takeover, surveillance disruption, or use as a foothold for further network attacks.
If Mitigated
Limited impact if devices are isolated in separate network segments with strict firewall rules preventing external access.
🎯 Exploit Status
Public proof-of-concept code exists in GitHub repositories. The unauthenticated nature and stack-based buffer overflow make exploitation relatively straightforward for attackers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after v4.15.77
Vendor Advisory: No official vendor advisory URL found in provided references
Restart Required: Yes
Instructions:
1. Check current firmware version on camera system. 2. Download latest firmware from vendor if available. 3. Apply firmware update following vendor instructions. 4. Reboot camera system. 5. Verify updated version is running.
🔧 Temporary Workarounds
Network Segmentation
allIsolate camera systems in separate VLAN or network segment with strict firewall rules
Access Control Lists
linuxImplement firewall rules to restrict access to camera management interfaces
iptables -A INPUT -p tcp --dport [camera_port] -s [trusted_network] -j ACCEPT
iptables -A INPUT -p tcp --dport [camera_port] -j DROP
🧯 If You Can't Patch
- Remove internet-facing exposure immediately by placing cameras behind VPN or removing public access
- Implement strict network segmentation to isolate cameras from critical systems
🔍 How to Verify
Check if Vulnerable:
Check firmware version via camera web interface or management console. If version is between v3.10.73 and v4.15.77 inclusive, device is vulnerable.Check Version:
Check via camera web interface at http://[camera_ip]/ or vendor-specific management toolVerify Fix Applied:
Verify firmware version is v4.15.78 or higher after update. Test that camera functions normally and no unexpected behavior occurs.📡 Detection & Monitoring
Log Indicators:
- Unusual network connections to camera management ports
- Multiple failed connection attempts followed by successful connection
- Camera system restart or crash logs
Network Indicators:
- Unusual traffic patterns to camera management ports (typically TCP)
- Large or malformed packets sent to camera systems
- Outbound connections from cameras to unexpected destinations
SIEM Query:
source_ip=[camera_ip] AND (port=[camera_management_port] AND bytes_sent>threshold) OR (event_type="system_crash" AND device_type="camera")