CVE-2022-50691
📋 TL;DR
CVE-2022-50691 is a critical remote command execution vulnerability in MiniDVBLinux 5.4 that allows unauthenticated attackers to execute arbitrary commands as root via the /tpl/commands.sh endpoint. This affects all systems running the vulnerable MiniDVBLinux version, potentially giving attackers complete control over affected devices.
💻 Affected Systems
- MiniDVBLinux
📦 What is this software?
Minidvblinux by Minidvblinux
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with root-level persistence, data theft, lateral movement, and potential use as a botnet node.
Likely Case
Remote attackers gain root shell access, install backdoors, steal credentials, and pivot to other network systems.
If Mitigated
Attackers cannot execute commands but may still probe the system; proper network segmentation limits damage.
🎯 Exploit Status
Simple HTTP GET request with command injection; exploit code is publicly available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified
Vendor Advisory: Not available
Restart Required: No
Instructions:
No official patch available; apply workarounds or replace with alternative software.
🔧 Temporary Workarounds
Block access to vulnerable endpoint
linuxUse firewall rules or web server configuration to block access to /tpl/commands.sh
iptables -A INPUT -p tcp --dport 80 -m string --string "/tpl/commands.sh" --algo bm -j DROP
iptables -A INPUT -p tcp --dport 443 -m string --string "/tpl/commands.sh" --algo bm -j DROP
Disable web interface
linuxTurn off the MiniDVBLinux web service if not required
systemctl stop minidvblinux-web
systemctl disable minidvblinux-web
🧯 If You Can't Patch
- Isolate affected systems in separate network segment with strict firewall rules
- Implement network-based intrusion detection to monitor for exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check if MiniDVBLinux 5.4 is installed and if /tpl/commands.sh endpoint responds to HTTP requestsCheck Version:
cat /etc/os-release | grep -i minidvblinuxVerify Fix Applied:
Verify web interface is disabled or /tpl/commands.sh endpoint is inaccessible📡 Detection & Monitoring
Log Indicators:
- HTTP requests to /tpl/commands.sh with command parameters
- Unusual process execution from web server user
- System commands executed from web service context
Network Indicators:
- HTTP GET requests containing shell metacharacters or command injection patterns
- Outbound connections from MiniDVBLinux systems to suspicious IPs
SIEM Query:
source="web_access.log" AND uri="/tpl/commands.sh" AND (query="*command=*" OR query="*;*" OR query="*|*" OR query="*`*" OR query="*$(*")