CVE-2020-29017
📋 TL;DR
This CVE describes an OS command injection vulnerability in FortiDeceptor that allows remote authenticated attackers to execute arbitrary commands on the system. The vulnerability exists in the Customization page and affects FortiDeceptor versions 3.1.0, 3.0.1, and 3.0.0. Attackers with valid credentials can exploit this to gain full control of affected systems.
💻 Affected Systems
- FortiDeceptor
📦 What is this software?
Fortideceptor by Fortinet
Fortideceptor by Fortinet
Fortideceptor by Fortinet
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attackers to install persistent backdoors, exfiltrate sensitive data, pivot to other network resources, or deploy ransomware.
Likely Case
Attackers gain shell access to the FortiDeceptor appliance, enabling them to modify configurations, disable security controls, and use the system as a foothold for lateral movement.
If Mitigated
Limited impact due to network segmentation, strong authentication controls, and monitoring that detects command injection attempts.
🎯 Exploit Status
Exploitation requires valid credentials but is straightforward once authenticated. The vulnerability is in a web interface component accessible to authenticated users.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: FortiDeceptor 3.2.0 and later
Vendor Advisory: https://www.fortiguard.com/psirt/FG-IR-20-177
Restart Required: Yes
Instructions:
1. Download FortiDeceptor 3.2.0 or later from Fortinet support portal. 2. Backup current configuration. 3. Upload and install the new firmware via web interface or CLI. 4. Reboot the appliance after installation completes.
🔧 Temporary Workarounds
Restrict Access to Management Interface
allLimit access to FortiDeceptor web interface to trusted IP addresses only
Configure firewall rules to restrict access to FortiDeceptor management IP/ports
Implement Strong Authentication Controls
allEnforce multi-factor authentication and strong password policies for all administrative accounts
Enable MFA in FortiDeceptor settings
Set minimum password length to 12+ characters
🧯 If You Can't Patch
- Isolate FortiDeceptor appliance in a dedicated VLAN with strict firewall rules limiting outbound connections
- Implement network monitoring and IDS/IPS rules to detect command injection patterns in web traffic
🔍 How to Verify
Check if Vulnerable:
Check FortiDeceptor version via web interface (System > Dashboard) or CLI command 'get system status'Check Version:
get system status | grep VersionVerify Fix Applied:
Verify version is 3.2.0 or later and test Customization page functionality📡 Detection & Monitoring
Log Indicators:
- Unusual command execution in system logs
- Multiple failed authentication attempts followed by successful login
- Suspicious POST requests to customization-related endpoints
Network Indicators:
- Unusual outbound connections from FortiDeceptor appliance
- Command injection patterns in HTTP requests to management interface
SIEM Query:
source="fortideceptor" AND (event_type="command_execution" OR uri_path="/customization" AND method="POST")