Executive Summary

CVE-2019-25559 is a denial of service (DoS) vulnerability in SpotPaltalk version 1.1.5. It occurs in the registration code input field called the Name/Key field. Local attackers can cause the application to crash by submitting an excessively long string—specifically, a buffer of 1000 characters—into this field during registration and then clicking the OK button.

This vulnerability is due to improper handling of input length, which leads to a buffer overflow condition that crashes the application.

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Impact Analysis

The primary impact of this vulnerability is a denial of service, meaning that an attacker can crash the SpotPaltalk application on a local machine by exploiting the input field flaw.

This crash disrupts the availability of the application, potentially causing inconvenience or interruption of service for legitimate users.

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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 SpotPaltalk 1.1.5 application. A proof-of-concept exploit involves creating a buffer of 1000 characters and pasting it into the Name/Key registration field.'}, {'type': 'list_item', 'content': "Create a file containing 1000 'A' characters (e.g., using a Python script to generate '\\x41' * 1000)."}, {'type': 'list_item', 'content': 'Copy the contents of this file to the clipboard.'}, {'type': 'list_item', 'content': "Open SpotPaltalk, navigate to 'Register' > 'Enter Registration Code...'."}, {'type': 'list_item', 'content': 'Paste the 1000-character buffer into the Name/Key field.'}, {'type': 'list_item', 'content': 'Click the OK button and observe if the application crashes, indicating the presence of the vulnerability.'}] [1, 2]

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Mitigation Strategies

Immediate mitigation steps include avoiding the use of SpotPaltalk version 1.1.5 or earlier until a patch or update is available.

Limit local user access to the application to prevent exploitation by local attackers.

Educate users not to paste or enter excessively long strings into the Name/Key registration field.

Monitor for application crashes related to the registration process as an indicator of attempted exploitation.

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