CVE-2020-7848
📋 TL;DR
CVE-2020-7848 is a command injection vulnerability in EFM ipTIME C200 IP cameras that allows remote attackers to execute arbitrary operating system commands via specially crafted cookie values in GET requests to the /login.cgi?logout=1 endpoint. This affects organizations and individuals using these cameras for surveillance or monitoring purposes, potentially giving attackers full control of the device.
💻 Affected Systems
- EFM ipTIME C200 IP Camera
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the IP camera allowing attackers to execute arbitrary commands, install malware, pivot to internal networks, disable surveillance, or use the device as part of a botnet.
Likely Case
Attackers gain shell access to the camera, can modify camera settings, disable recording, exfiltrate video footage, or use the device for further network reconnaissance.
If Mitigated
Limited impact if cameras are isolated on separate network segments with strict firewall rules preventing external access.
🎯 Exploit Status
Exploitation requires only a single HTTP GET request with malicious cookie values. No authentication required, making it trivial to exploit.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor for latest firmware
Vendor Advisory: https://www.boho.or.kr/krcert/secNoticeView.do?bulletin_writing_sequence=35905
Restart Required: Yes
Instructions:
1. Access camera web interface. 2. Navigate to firmware update section. 3. Download latest firmware from vendor. 4. Upload and apply firmware update. 5. Camera will reboot automatically.
🔧 Temporary Workarounds
Network Segmentation
allIsolate IP cameras on separate VLAN with strict firewall rules
Access Control
linuxBlock external access to camera web interface ports (typically 80, 443, 8080)
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
iptables -A INPUT -p tcp --dport 8080 -j DROP
🧯 If You Can't Patch
- Segment cameras on isolated network with no internet access
- Implement strict firewall rules blocking all inbound traffic to camera management interfaces
🔍 How to Verify
Check if Vulnerable:
Test by sending GET request to /login.cgi?logout=1 with command injection payload in cookie. Monitor for unexpected command execution.Check Version:
Check firmware version in camera web interface under System Information or SettingsVerify Fix Applied:
Attempt exploitation after patch. Successful patch should reject malicious cookie values and not execute commands.📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP requests to /login.cgi with suspicious cookie values
- Multiple failed login attempts followed by command execution patterns
- System logs showing unexpected process execution
Network Indicators:
- HTTP GET requests to /login.cgi?logout=1 with shell metacharacters in cookies
- Outbound connections from cameras to unexpected destinations
- Sudden spikes in camera network traffic
SIEM Query:
source="camera_logs" AND uri="/login.cgi" AND (cookie CONTAINS "|" OR cookie CONTAINS ";" OR cookie CONTAINS "`" OR cookie CONTAINS "$")