Denial of Service in TapinRadio Proxy Address Configuration

Executive Summary

[{'type': 'paragraph', 'content': "CVE-2020-37170 is a denial of service (DoS) vulnerability in TapinRadio version 2.12.3. It occurs when a local attacker inputs a specially crafted string of 3000 bytes into the application's proxy address configuration field. This causes the application to crash by overwriting the address field with excessive data, disrupting normal program functionality."}, {'type': 'paragraph', 'content': 'The vulnerability is a classic buffer overflow issue (CWE-120), where the application does not properly check the size of the input before copying it, leading to the crash.'}] [1, 2]

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Impact Analysis

This vulnerability can cause the TapinRadio application to crash, resulting in a denial of service. An attacker with local access can exploit this by entering a large amount of arbitrary data into the proxy address field, which prevents the application from functioning normally.

The impact is primarily on availability, as the application becomes unusable until restarted or fixed. This could disrupt users who rely on TapinRadio for streaming internet radio.

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Compliance Impact

I don't know

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Detection Guidance

[{'type': 'paragraph', 'content': 'This vulnerability is local and requires user interaction within the TapinRadio application. Detection involves verifying if the application is vulnerable to a denial of service condition triggered by overwriting the proxy address field with a large input.'}, {'type': 'paragraph', 'content': "A practical detection method is to attempt the exploit in a controlled environment by creating a text file containing 3000 'A' characters, copying it to the clipboard, and pasting it into the 'Address' field under 'Settings' > 'Preferences' > 'Miscellaneous' > 'Set Application Proxy...' in TapinRadio version 2.12.3. If the application crashes, it confirms the vulnerability."}, {'type': 'list_item', 'content': 'Create a file named tapin_add.txt with 3000 \'A\' characters: `python -c "print(\'A\'*3000)" > tapin_add.txt`'}, {'type': 'list_item', 'content': 'Open tapin_add.txt, copy all content to clipboard.'}, {'type': 'list_item', 'content': 'Open TapinRadio, navigate to Settings > Preferences > Miscellaneous > Set Application Proxy...'}, {'type': 'list_item', 'content': "Paste the clipboard content into the 'Address' field, fill in arbitrary values for 'Port' (e.g., 444), 'Username' (e.g., test), and 'Password' (e.g., 1234), then confirm."}, {'type': 'paragraph', 'content': 'If the application crashes, the vulnerability is present.'}] [1, 2]

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Mitigation Strategies

[{'type': 'paragraph', 'content': "To mitigate this vulnerability, immediate steps include avoiding the use of the proxy address configuration feature in TapinRadio version 2.12.3 or earlier, especially refraining from pasting large or untrusted input into the 'Address' field."}, {'type': 'paragraph', 'content': 'Since the vulnerability requires local user interaction, restricting access to the application and limiting user permissions can reduce the risk.'}, {'type': 'paragraph', 'content': 'Additionally, upgrading to a newer version of TapinRadio where this vulnerability is fixed (such as versions later than 2.12.3) is recommended.'}] [2, 3]

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