Executive Summary

CVE-2018-25227 is a denial of service (DoS) vulnerability in Valentina Studio version 9.0.4 and earlier. It occurs when a local attacker supplies an excessively long string—specifically a 256-byte buffer of repeated characters—in the Host field during server connection attempts. This causes the application to crash.

The vulnerability is related to improper handling of input length in the Host parameter, leading to a buffer overflow condition that crashes the application.

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Compliance Impact

The provided information does not specify any impact of this vulnerability on compliance with common standards and regulations such as GDPR or HIPAA.

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Impact Analysis

This vulnerability can impact you by causing Valentina Studio to crash, resulting in a denial of service. An attacker with local access can trigger this crash by providing a specially crafted input in the Host field, disrupting your ability to use the application.

The impact is on availability, as the application becomes unusable until restarted or fixed.

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Detection Guidance

This vulnerability can be detected by attempting to reproduce the crash condition in Valentina Studio 9.0.4 or earlier versions. Specifically, by supplying an excessively long string of 256 repeated characters into the Host field during a server connection attempt, the application will crash if vulnerable.

A practical detection method involves creating a 256-character payload and pasting it into the Host input field in the 'Connect to Valentina Server' dialog. If the application crashes, the vulnerability is present.

For example, you can generate the payload using a simple Python command to create a file with 256 'A' characters, then copy its content to the clipboard:

• python -c "print('A'*256)" > valentina.txt

Then copy the content of valentina.txt to the clipboard and paste it into the Host field in Valentina Studio's connection dialog.

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Mitigation Strategies

To mitigate this vulnerability, the immediate step is to avoid supplying excessively long strings (256 bytes or more) in the Host field when connecting to a Valentina Server using Valentina Studio 9.0.4 or earlier.

Additionally, consider upgrading to a later version of Valentina Studio where this vulnerability is fixed or no longer present.

If upgrading is not immediately possible, restrict local user access to Valentina Studio to trusted users only, as the attack requires local access.

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