Executive Summary

CVE-2018-25245 is a denial of service (DoS) vulnerability in Microsoft 7 Tik version 1.0.1.0 and earlier. It occurs because the application's search functionality does not properly handle excessively long input strings.

An attacker can exploit this vulnerability by submitting a buffer of approximately 7,700 characters into the search bar, which causes the application to crash due to a buffer overflow triggered by the oversized input.

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Impact Analysis

This vulnerability can impact you by causing the Microsoft 7 Tik application to crash, resulting in a denial of service condition.

Since the attack requires no privileges or user interaction and can be executed remotely over the network, it can disrupt availability of the application, potentially affecting productivity or service continuity.

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Detection Guidance

This vulnerability can be detected by attempting to reproduce the denial of service condition on the Microsoft 7 Tik application version 1.0.1.0. Specifically, you can create a payload consisting of approximately 7,700 characters and submit it to the search bar of the application to see if it crashes.

A practical method involves generating a file with 7,700 'A' characters and then copying and pasting this string into the search functionality of the vulnerable application.

For example, you can use a simple Python command to create such a payload file:

• python -c "print('A' * 7700)" > PoC.txt

Then, open the PoC.txt file, copy its contents, and paste it into the search bar of the Microsoft 7 Tik application. If the application crashes, the vulnerability is present.

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Mitigation Strategies

Immediate mitigation steps include avoiding the use of the vulnerable search functionality with excessively long input strings to prevent application crashes.

If possible, restrict or filter input lengths on the search bar to prevent inputs longer than a safe threshold (less than 7,700 characters).

Additionally, consider updating or patching the application if a fixed version is available from the vendor.

As a temporary measure, monitor and restrict network access to the application to prevent remote exploitation.

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Compliance Impact

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

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