Executive Summary

This vulnerability is a denial of service (DoS) issue in GeoGebra Classic 5.0.631.0-d where an attacker can crash the application by inputting an excessively large string into the 'Entrada:' input field. Specifically, by pasting a buffer of 800,000 repeated characters, the application crashes, causing it to become unavailable. [1]

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Impact Analysis

The impact of this vulnerability is that an attacker with local access to the system running GeoGebra Classic can cause the application to crash by inputting a very large string. This results in a denial of service, making the application unusable until restarted, which could disrupt work or learning activities relying on the software. [1]

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Detection Guidance

This vulnerability can be detected by attempting to reproduce the denial of service condition locally. You can create a large payload of 800,000 repeated characters (e.g., 'A') using a Python script or command, save it to a file, and then paste the contents into the 'Entrada:' input field of GeoGebra Classic 5.0.631.0-d. If the application crashes, the vulnerability is present. For example, you can use a Python script to generate the payload or use a command like: python -c "print('A'*800000)" > payload.txt Then open GeoGebra Classic, paste the contents of payload.txt into the input field, and observe if the application crashes. [1]

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Mitigation Strategies

Immediate mitigation steps include avoiding pasting or inputting excessively large strings (such as 800,000 repeated characters) into the 'Entrada:' input field of GeoGebra Classic 5.0.631.0-d. Restrict access to the application to trusted users only, and monitor for any unusual input activity. Since the exploit is local and requires user interaction, limiting user privileges and educating users about this issue can help reduce risk until an official patch or update is available. [1]

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