CVE-2023-53774: CRITICAL Severity Remote Code Execution in MiniDVBLinux | Secably CVE Database

Summary

CVE-2023-53774 is a critical remote code execution (RCE) vulnerability affecting MiniDVBLinux 5.4. This vulnerability resides in the Simple Video Disk Recorder Protocol (SVDRP) and allows remote attackers to execute arbitrary commands on the system, potentially gaining full control of the video disk recorder.

Technical Details

The vulnerability stems from insufficient input validation within the SVDRP protocol implementation in MiniDVBLinux. The svdrpsend.sh script, used to send commands to the VDR, does not adequately sanitize user-supplied input. An attacker can craft malicious SVDRP commands and inject them through the script, leading to the execution of arbitrary code with the privileges of the VDR process. The SVDRP protocol, designed for remote control of the video disk recorder, lacks proper authentication or authorization mechanisms by default, making it susceptible to exploitation from any network-accessible host.

Specifically, the vulnerability can be triggered by sending specially crafted commands that exploit command injection flaws in the way the SVDRP server processes input. This allows an attacker to bypass intended security measures and execute system commands directly on the server.

Affected Products and Versions

MiniDVBLinux 5.4

Impact Assessment

Successful exploitation of CVE-2023-53774 can have severe consequences. An attacker can gain complete control over the affected MiniDVBLinux system, leading to:

Remote Code Execution: Arbitrary commands can be executed on the system, allowing the attacker to install malware, modify system configurations, or steal sensitive data.
System Compromise: The entire system can be compromised, potentially leading to a denial-of-service (DoS) condition or further attacks on other systems on the network.
Data Breach: Sensitive data stored on the video disk recorder, such as recorded videos or configuration files, can be accessed and exfiltrated by the attacker.
Loss of Confidentiality, Integrity, and Availability: The attacker can compromise the confidentiality of stored data, modify system settings, and disrupt the availability of the VDR service.

Remediation

Immediate Actions

Restrict Network Access: Immediately restrict network access to the SVDRP port (typically port 2001) to trusted IP addresses only. Use firewall rules to block unauthorized access.
Disable SVDRP if Unused: If the SVDRP protocol is not required, disable it completely to eliminate the attack surface.
Monitor Network Traffic: Monitor network traffic for suspicious SVDRP commands or unusual activity originating from or directed to the MiniDVBLinux system.

Long-term Solutions

Apply Security Patches: Check the MiniDVBLinux website for available security patches or updates that address this vulnerability. Apply any available patches as soon as possible.
Implement Strong Authentication: If SVDRP is required, implement strong authentication mechanisms to prevent unauthorized access. Consider using SSH tunneling or VPNs to encrypt and secure the communication channel.
Input Validation: Implement robust input validation and sanitization routines in the SVDRP server to prevent command injection attacks. Ensure that all user-supplied input is properly validated before being processed.
Least Privilege Principle: Run the VDR process with the least necessary privileges to minimize the impact of a successful exploit.

References

Detection & Scanning

This vulnerability can be detected by analyzing network traffic for suspicious SVDRP commands or by scanning the MiniDVBLinux system for known vulnerabilities. Look for unusual activity on port 2001 and examine SVDRP command syntax for potential injection attempts.

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