Executive Summary

[{'type': 'paragraph', 'content': "CVE-2020-37171 is a denial of service vulnerability in TapinRadio version 2.12.3 that affects the application's proxy username configuration."}, {'type': 'paragraph', 'content': 'A local attacker can exploit this vulnerability by inputting an excessively long string (around 10,000 bytes) into the username field of the proxy settings, which causes the application to crash.'}, {'type': 'paragraph', 'content': 'This crash disrupts normal program functionality, effectively causing a denial of service.'}] [1, 2]

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Impact Analysis

The vulnerability allows a local attacker to crash the TapinRadio application by overwriting the proxy username field with a large amount of data.

This results in a denial of service, preventing normal use of the application.

Since the attack requires local access and user interaction, it may disrupt availability but does not compromise confidentiality or integrity.

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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 checking if the TapinRadio application version 2.12.3 or earlier is installed and if the application proxy username field can be overwritten with a very long string (around 10,000 characters) causing the application to crash.'}, {'type': 'paragraph', 'content': "A practical detection method involves attempting to input a long string of characters (e.g., 10,000 'A's) into the username field under Settings > Preferences > Miscellaneous > Set Application Proxy in TapinRadio and observing if the application crashes."}, {'type': 'paragraph', 'content': 'There is a known Python script exploit that writes a long string to a file and copies it to the clipboard for pasting into the username field, which can be adapted as a test.'}] [1]

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Mitigation Strategies

To mitigate this vulnerability immediately, avoid allowing untrusted local users to access or modify the TapinRadio proxy username configuration.

Restrict local user permissions to prevent unauthorized changes to the application settings.

If possible, update or patch TapinRadio to a version where this vulnerability is fixed, or consider disabling the proxy username configuration feature until a fix is available.

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