CVE-2020-16205
📋 TL;DR
CVE-2020-16205 is an OS command injection vulnerability in Geutebruck G-Cam and G-Code devices that allows remote authenticated attackers to execute arbitrary commands as root. This affects firmware versions 1.12.0.25 and prior, plus limited versions 1.12.13.2 and 1.12.14.5. Attackers can achieve complete system compromise through specially crafted URL commands.
💻 Affected Systems
- Geutebruck G-Cam
- Geutebruck G-Code
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system takeover with root privileges, allowing installation of persistent backdoors, data exfiltration, and use as pivot point for network attacks.
Likely Case
Unauthorized access to video feeds, device configuration changes, credential theft, and lateral movement within the network.
If Mitigated
Limited impact if devices are isolated in separate VLANs with strict network segmentation and access controls.
🎯 Exploit Status
Exploit code is publicly available via Packet Storm Security. Attack requires authentication but is trivial to execute once authenticated.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Firmware versions after 1.12.0.25 (excluding 1.12.13.2 and 1.12.14.5)
Vendor Advisory: https://us-cert.cisa.gov/ics/advisories/icsa-20-219-03
Restart Required: Yes
Instructions:
1. Download latest firmware from Geutebruck support portal. 2. Backup device configuration. 3. Upload firmware via web interface. 4. Apply firmware update. 5. Reboot device. 6. Restore configuration if needed.
🔧 Temporary Workarounds
Network Segmentation
allIsolate Geutebruck devices in separate VLAN with strict firewall rules
Access Control Restrictions
allImplement strict authentication controls and disable unnecessary accounts
🧯 If You Can't Patch
- Segment devices in isolated network zone with no internet access
- Implement strict firewall rules to limit access to trusted IP addresses only
🔍 How to Verify
Check if Vulnerable:
Check firmware version via web interface or SSH. Versions 1.12.0.25 and prior, plus 1.12.13.2 and 1.12.14.5 are vulnerable.Check Version:
Check via web interface at System > Information or via SSH: cat /etc/versionVerify Fix Applied:
Verify firmware version is updated to version after 1.12.0.25 (excluding vulnerable limited versions). Test with known exploit payloads to confirm patched.📡 Detection & Monitoring
Log Indicators:
- Unusual URL patterns containing shell commands in web logs
- Multiple failed authentication attempts followed by successful login
- Unusual process execution from web service
Network Indicators:
- HTTP requests to testaction.cgi with command injection parameters
- Outbound connections from device to unexpected destinations
SIEM Query:
source="web_logs" AND (uri="*testaction.cgi*" AND (uri="*|*" OR uri="*;*" OR uri="*`*"))🔗 References
- http://packetstormsecurity.com/files/158888/Geutebruck-testaction.cgi-Remote-Command-Execution.html
- https://us-cert.cisa.gov/ics/advisories/icsa-20-219-03
- http://packetstormsecurity.com/files/158888/Geutebruck-testaction.cgi-Remote-Command-Execution.html
- https://us-cert.cisa.gov/ics/advisories/icsa-20-219-03
