Command Injection in D-Link NAS Devices

Executive Summary

This vulnerability is a command injection flaw in multiple D-Link network-attached storage (NAS) devices. It exists in the cgi_check_rsync_rw function of the /cgi-bin/remote_backup.cgi file. An attacker can manipulate the 'ip' argument to inject and execute arbitrary commands remotely. The exploit is publicly available.

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Detection Guidance

This vulnerability involves command injection via the cgi_check_rsync_rw function in /cgi-bin/remote_backup.cgi. To detect it, scan for affected D-Link devices on your network using tools like nmap to identify vulnerable models. Check for open ports 80 or 443 and test the /cgi-bin/remote_backup.cgi endpoint with crafted requests to see if command injection is possible.

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Impact Analysis

If you use any of the affected D-Link NAS devices, an attacker could gain unauthorized access to your system, execute malicious commands, steal data, or disrupt services. This could lead to data breaches, loss of sensitive information, or system compromise.

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Compliance Impact

The vulnerability allows remote command injection via the ip argument in the cgi_check_rsync_rw function, which could lead to unauthorized access and data exfiltration. This could violate GDPR's data protection requirements by exposing personal data and HIPAA's security rules by compromising protected health information if such data is stored on affected devices.

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Mitigation Strategies

Immediately isolate affected D-Link devices from your network to prevent remote exploitation. Disable remote backup features if possible. Update firmware to the latest version if a patch is available. Monitor network traffic for suspicious activity targeting the /cgi-bin/remote_backup.cgi endpoint. Consider replacing unsupported devices with secure alternatives.

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