Executive Summary

[{'type': 'paragraph', 'content': 'CVE-2019-25548 is a denial of service (DoS) vulnerability in BlueStacks version 4.80.0.1060 and earlier. It occurs because the application improperly handles very large input submitted to its search field.'}, {'type': 'paragraph', 'content': "An attacker with local access can exploit this by pasting a buffer of 100,000 'A' characters into the search field and triggering a search operation, which causes the application to crash."}, {'type': 'paragraph', 'content': 'This vulnerability is classified under CWE-466 (Return of Pointer Value Outside of Expected Range) and results in a denial of service by crashing the BlueStacks application.'}] [1, 3]

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Impact Analysis

This vulnerability can cause the BlueStacks application to crash, resulting in a denial of service.

An attacker with local access can disrupt the availability of the application by submitting an oversized input to the search field, making the application unusable until restarted.

Since the impact is on availability, it can interrupt normal use of BlueStacks, potentially affecting productivity or access to services running through the emulator.

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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 locally on the system running BlueStacks 4.80.0.1060 or earlier.'}, {'type': 'list_item', 'content': 'Create a file containing 100,000 \'A\' characters (e.g., using a Python script to generate a file named "exploit.txt" with the content "A" * 100000).'}, {'type': 'list_item', 'content': 'Copy the contents of this file to the clipboard.'}, {'type': 'list_item', 'content': 'Open the BlueStacks application.'}, {'type': 'list_item', 'content': 'Paste the clipboard content into the BlueStacks search field.'}, {'type': 'list_item', 'content': 'Trigger the search operation by clicking the search button.'}, {'type': 'paragraph', 'content': 'If the application crashes, the vulnerability is present.'}] [3]

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Mitigation Strategies

To mitigate this vulnerability immediately, avoid pasting or submitting excessively large inputs (such as buffers of 100,000 characters) into the BlueStacks search field.

Restrict local access to the BlueStacks application to trusted users only, as the attack requires local access.

Monitor for application crashes related to search operations and restart BlueStacks if necessary.

Check for updates or patches from BlueStacks that address this vulnerability and apply them as soon as they become available.

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