Executive Summary

CVE-2018-25211 is a buffer overflow vulnerability in Allok Video Splitter version 3.1.1217 and earlier. It occurs when a local attacker inputs an excessively long string—over 780 bytes—into the License Name registration field. When the Register button is clicked, this oversized input triggers a buffer overflow, which can cause the application to crash or allow the attacker to execute arbitrary code.

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Compliance Impact

The provided information does not specify any direct 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 a denial of service, making the application crash and become unusable. More severely, it can allow an attacker to execute arbitrary code on your system, potentially compromising confidentiality, integrity, and availability of your data and system.

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Detection Guidance

This vulnerability can be detected by attempting to reproduce the buffer overflow condition locally on the system running Allok Video Splitter version 3.1.1217 or earlier.

A practical detection method involves creating a test input string exceeding 780 bytes and pasting it into the License Name registration field of the application, then clicking the Register button to observe if the application crashes or behaves unexpectedly.

For example, you can generate a test file containing 780 'A' characters using the following command in a Windows environment with Python installed:

• python -c "print('A'*780)" > Evil.txt

Then, open the generated Evil.txt file, copy its contents, paste it into the License Name field of the application, and click Register to check for a crash or denial of service.

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Mitigation Strategies

Immediate mitigation steps include avoiding the use of the License Name registration field with inputs longer than 780 bytes to prevent triggering the buffer overflow.

Restrict local access to the system running Allok Video Splitter to trusted users only, since the attack requires local access and user interaction.

Monitor and control user permissions to prevent untrusted users from interacting with the application.

Check for updates or patches from the vendor (http://www.alloksoft.com/) that address this vulnerability and apply them as soon as they become available.

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