CVE-2023-53774
📋 TL;DR
MiniDVBLinux 5.4 contains a remote code execution vulnerability in the SVDRP protocol, allowing attackers to send crafted commands via the svdrpsend.sh script to manipulate TV systems and potentially control the video disk recorder remotely. This affects users of MiniDVBLinux 5.4 with SVDRP enabled, particularly those exposing the service to untrusted networks.
💻 Affected Systems
- MiniDVBLinux
📦 What is this software?
Minidvblinux by Minidvblinux
⚠️ Risk & Real-World Impact
Worst Case
Attackers gain full remote control of the video disk recorder, execute arbitrary commands, manipulate recordings, and potentially pivot to other systems on the network.
Likely Case
Remote attackers exploit the vulnerability to disrupt TV services, execute unauthorized commands, or access sensitive data on the vulnerable system.
If Mitigated
With proper network segmentation and access controls, impact is limited to isolated systems, preventing lateral movement or broader compromise.
🎯 Exploit Status
Exploit details are publicly available, making it easy for attackers to craft and send malicious SVDRP commands.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: https://www.minidvblinux.de
Restart Required: No
Instructions:
No official patch is available; apply workarounds such as disabling SVDRP or restricting network access.
🔧 Temporary Workarounds
Disable SVDRP Service
linuxStop and disable the SVDRP service to prevent remote exploitation.
sudo systemctl stop svdrp
sudo systemctl disable svdrp
Restrict Network Access
linuxUse firewall rules to block incoming connections to the SVDRP port (default 6419).
sudo iptables -A INPUT -p tcp --dport 6419 -j DROP
🧯 If You Can't Patch
- Isolate the vulnerable system in a segmented network to limit exposure.
- Monitor network traffic for unusual SVDRP command patterns and implement strict access controls.
🔍 How to Verify
Check if Vulnerable:
Check if MiniDVBLinux 5.4 is installed and SVDRP is running on port 6419 using: sudo netstat -tlnp | grep 6419Check Version:
Check the MiniDVBLinux version in system documentation or configuration files.Verify Fix Applied:
Verify SVDRP service is stopped or port 6419 is blocked: sudo systemctl status svdrp; sudo iptables -L | grep 6419📡 Detection & Monitoring
Log Indicators:
- Unusual SVDRP command entries in system logs
- Failed or unauthorized access attempts to SVDRP service
Network Indicators:
- Suspicious traffic to port 6419 from untrusted sources
- Anomalous SVDRP protocol patterns
SIEM Query:
Example: source_port=6419 AND (event_type="svdrp_command" OR protocol="SVDRP")🔗 References
- https://www.exploit-db.com/exploits/51093
- https://www.linuxtv.org/vdrwiki/index.php/SVDRP#The_commands
- https://www.minidvblinux.de
- https://www.vulncheck.com/advisories/minidvblinux-simple-videodiskrecorder-protocol-remote-code-execution
- https://www.zeroscience.mk/en/vulnerabilities/ZSL-2022-5714.php
