Executive Summary

CVE-2018-25226 is a buffer overflow vulnerability in FTPShell Server version 6.83 and earlier. It occurs when a local attacker supplies an excessively long string—specifically a 417-byte payload—in the 'Account name to ban' field within the Manage FTP Accounts interface. This input causes the application to crash due to improper handling of the account name string.

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Impact Analysis

This vulnerability can be exploited by local attackers to cause a denial of service (DoS) by crashing the FTPShell Server application. By inputting a specially crafted 417-byte string into the 'Account name to ban' field, the server crashes, disrupting service availability.

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Detection Guidance

This vulnerability can be detected by attempting to reproduce the crash condition on the FTPShell Server 6.83 application by supplying a specially crafted input in the 'Account name to ban' field within the Manage FTP Accounts interface.

A practical detection method involves using a payload consisting of 417 'A' characters to trigger the buffer overflow and cause the application to crash, indicating the presence of the vulnerability.

• Run the provided Python script (FTPShell_Server_6.83.py) to generate a file named ftpshell.txt containing the 417-byte payload.
• Copy the contents of ftpshell.txt to the clipboard.
• Open the FTPShell Server application.
• Navigate to 'Manage FTP Accounts', select 'Add Account Name', and paste the payload into the 'Account name to ban' field.
• Click 'Ok' and observe if the application crashes, confirming the vulnerability.

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Compliance Impact

The provided information does not include any details on how this vulnerability affects compliance with common standards and regulations such as GDPR or HIPAA.

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Mitigation Strategies

To mitigate the vulnerability in FTPShell Server 6.83, avoid supplying excessively long strings (specifically 417-byte payloads) in the 'Account name to ban' field within the Manage FTP Accounts interface.

Restrict local access to the FTPShell Server application to trusted users only, as the attack requires local access.

Monitor and control inputs in the Manage FTP Accounts interface to prevent buffer overflow attempts.

If possible, update or patch the software to a version that addresses this buffer overflow vulnerability.

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