Executive Summary

CVE-2019-25599 is a denial of service (DoS) vulnerability in Backup Key Recovery version 2.2.4 and earlier. It occurs because the application does not properly handle an excessively long string input in the Name field during user registration.

Local attackers can exploit this by pasting a string of 300 or more characters into the Name field, which causes the application to crash when the registration form is submitted.

This crash happens due to a pointer value being returned outside the expected range, which is a form of improper input validation or buffer handling.

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Impact Analysis

This vulnerability can impact you by causing the Backup Key Recovery application to crash, resulting in a denial of service condition.

Since the attack requires local access but no privileges or user interaction, an attacker with local access can disrupt the availability of the application.

The impact is specifically on availability, meaning legitimate users may be unable to use the application while it is crashed.

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Compliance Impact

I don't know

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Detection Guidance

[{'type': 'paragraph', 'content': 'This vulnerability can be detected by attempting to reproduce the denial of service condition locally on the affected Backup Key Recovery application version 2.2.4 or earlier.'}, {'type': 'paragraph', 'content': 'A practical detection method involves creating an input string of 300 or more characters and pasting it into the Name field during the registration process of the application. If the application crashes upon submission, the vulnerability is present.'}, {'type': 'list_item', 'content': 'Create a file named "backup.txt" containing 300 "A" characters (e.g., using a command like `python -c "print(\'A\'*300)" > backup.txt`).'}, {'type': 'list_item', 'content': 'Open the file and copy its contents to the clipboard.'}, {'type': 'list_item', 'content': 'Launch the Backup Key Recovery application and select the Register option.'}, {'type': 'list_item', 'content': 'Paste the clipboard content into the Name field and enter any value in the Key field.'}, {'type': 'list_item', 'content': 'Submit the form and observe if the application crashes, indicating the vulnerability.'}] [1, 2]

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Mitigation Strategies

To mitigate this vulnerability immediately, avoid allowing untrusted or excessively long input in the Name field during registration.

Restrict local access to the Backup Key Recovery application to trusted users only, since the attack requires local access.

Monitor and control user input lengths to ensure they do not exceed safe limits (less than 300 characters) in the Name field.

Consider applying any available patches or updates from the vendor once released.

If possible, run the application with least privilege to limit the impact of a crash.

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