Executive Summary

CVE-2026-7834 is a stack-based buffer overflow vulnerability in the ipTIME nas1dual network-attached storage device, specifically version 1.5.24 and earlier.

The flaw exists in the get_csrf_whites function, which reads a configuration value into a fixed 1024-byte stack buffer without properly validating the length of the input.

If the csrf_whites configuration value exceeds 1024 bytes, it can overwrite adjacent stack memory, leading to a buffer overflow.

An attacker can exploit this remotely by sending a crafted POST request to the /cgi/advanced/misc_main.cgi interface with an overly long csrf_whites value, causing the device to crash or potentially allowing arbitrary code execution.

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Impact Analysis

This vulnerability can lead to a denial of service by crashing the device due to the stack-based buffer overflow.

More critically, it may allow an attacker to execute arbitrary code remotely on the affected device, potentially leading to full compromise.

Since the exploit can be launched remotely without authentication, it poses a high risk to the security and availability of the device and any data stored on it.

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Detection Guidance

This vulnerability can be detected by monitoring for crafted POST requests sent to the endpoint /cgi/advanced/misc_main.cgi that contain an overly long csrf_whites value in the payload. Such requests attempt to trigger the stack-based buffer overflow.

One way to detect exploitation attempts is to capture and analyze network traffic for POST requests targeting /cgi/advanced/misc_main.cgi with unusually large csrf_whites parameters.

• Use a network packet capture tool like tcpdump or Wireshark to filter HTTP POST requests to /cgi/advanced/misc_main.cgi.
• Example tcpdump command to capture relevant traffic: tcpdump -i <interface> -A 'tcp port 80 and (((ip[2:2] - ((ip[0]&0xf)<<2)) - ((tcp[12]&0xf0)>>2)) != 0)' | grep -i 'POST /cgi/advanced/misc_main.cgi'
• Inspect the POST data for the csrf_whites parameter and check if its length exceeds normal expected sizes (greater than 1024 bytes).

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Mitigation Strategies

Immediate mitigation steps include restricting access to the vulnerable endpoint /cgi/advanced/misc_main.cgi to trusted networks or IP addresses to prevent remote exploitation.

Additionally, monitoring and blocking suspicious POST requests with unusually large csrf_whites parameters can help prevent exploitation attempts.

If possible, disable or restrict the use of the affected function or service until a patch or update is available from the vendor.

Since the vendor has not responded, consider implementing network-level protections such as web application firewalls (WAF) to detect and block exploit attempts targeting this vulnerability.

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Compliance Impact

The provided information does not specify how this vulnerability impacts compliance with common standards and regulations such as GDPR or HIPAA.

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