CVE-2017-2805
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on Foscam C1 Indoor HD cameras by sending a specially crafted HTTP request to the web management interface. The stack-based buffer overflow can lead to complete device compromise. Anyone using affected Foscam C1 cameras with the web interface exposed is vulnerable.
💻 Affected Systems
- Foscam C1 Indoor HD Camera
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device takeover leading to persistent backdoor installation, camera feed interception, lateral movement to other network devices, or use in botnets.
Likely Case
Remote code execution allowing attackers to disable cameras, steal video feeds, or use devices for DDoS attacks.
If Mitigated
Limited impact if cameras are isolated on separate VLANs with strict firewall rules blocking external access.
🎯 Exploit Status
The vulnerability requires no authentication and has a simple exploitation path via HTTP requests. Public exploit details are available in security advisories.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Firmware update from Foscam (specific version not specified in provided references)
Vendor Advisory: Not provided in references - check Foscam official website
Restart Required: Yes
Instructions:
1. Log into Foscam camera web interface. 2. Navigate to System > Upgrade. 3. Download latest firmware from Foscam website. 4. Upload and apply firmware update. 5. Camera will reboot automatically.
🔧 Temporary Workarounds
Network Isolation
linuxBlock external access to camera web interface using firewall rules
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
Disable Web Interface
allTurn off HTTP/HTTPS web management if not needed
🧯 If You Can't Patch
- Place cameras on isolated VLAN with no internet access
- Implement strict firewall rules blocking all inbound traffic to camera ports (80, 443, 8000, 8001)
🔍 How to Verify
Check if Vulnerable:
Check firmware version in camera web interface under System > Information. If version is outdated or matches vulnerable range, device is vulnerable.Check Version:
curl -s http://[camera-ip]/cgi-bin/CGIProxy.fcgi?cmd=getDevInfo | grep -i firmwareVerify Fix Applied:
After firmware update, verify version has changed and attempt to reproduce the buffer overflow with test payloads (in controlled environment).📡 Detection & Monitoring
Log Indicators:
- Unusual long HTTP requests to camera web interface
- Multiple failed login attempts followed by buffer overflow patterns
- Camera reboot logs without user action
Network Indicators:
- HTTP requests with unusually long parameters to camera IP
- Traffic patterns suggesting exploit delivery (specific buffer overflow payloads)
- Outbound connections from camera to unknown IPs
SIEM Query:
source="camera-logs" AND (http_uri_length>1000 OR http_user_agent="exploit" OR event_type="buffer_overflow")