Executive Summary

[{'type': 'paragraph', 'content': 'CVE-2020-37131 is a denial of service vulnerability in Nsauditor Product Key Explorer version 4.2.2.0 and earlier. It occurs because the application does not properly check the size of the input when copying data into a buffer, leading to a buffer overflow (CWE-120).'}, {'type': 'paragraph', 'content': "A local attacker can exploit this by inputting a specially crafted registration key consisting of 1000 repeated characters into the 'Key' input field. This causes the application to crash or become unresponsive."}] [1, 2]

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Impact Analysis

This vulnerability can cause the Product Key Explorer application to crash or become unresponsive, resulting in a denial of service condition.

Since the attack requires local access and user interaction, an attacker with local access can disrupt the availability of the application by triggering this crash.

The impact is primarily on availability, potentially interrupting legitimate use of the software.

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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 on the affected application, Nsauditor Product Key Explorer version 4.2.2.0 or earlier.'}, {'type': 'paragraph', 'content': "A practical detection method involves inputting a specially crafted registration key consisting of 1000 repeated characters into the 'Key' input field of the application."}, {'type': 'paragraph', 'content': "Specifically, you can create a payload of 1000 repeated characters (such as 'A') using a simple script or command, then paste this payload into the 'Register -> Enter Registration Code' dialog's 'Key' field and observe if the application crashes or becomes unresponsive."}, {'type': 'list_item', 'content': 'Use a Python script to generate the payload, for example:\n\n```python\nwith open(\'POC.txt\', \'w\') as f:\n f.write(\'A\' * 1000)\n```\n\nThen open the application, navigate to "Register -> Enter Registration Code", paste the contents of "POC.txt" into the \'Key\' field, and click "OK".'}] [1, 2]

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Mitigation Strategies

[{'type': 'paragraph', 'content': "Immediate mitigation steps include avoiding the input of excessively long or specially crafted registration keys into the 'Key' input field of Nsauditor Product Key Explorer version 4.2.2.0 or earlier."}, {'type': 'paragraph', 'content': 'Since the vulnerability requires local user interaction, restricting access to the application to trusted users only can reduce the risk.'}, {'type': 'paragraph', 'content': 'Additionally, monitoring for application crashes or instability related to the registration key input can help identify exploitation attempts.'}, {'type': 'paragraph', 'content': 'Ultimately, applying any available patches or updates from the vendor that address this vulnerability is recommended once they become available.'}] [1, 2]

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