Executive Summary

CVE-2019-25621 is a denial of service (DoS) vulnerability in Pixel Studio version 2.17 and earlier. It occurs because the application improperly handles malformed input provided through the keyboard interface.

Local attackers can exploit this vulnerability by entering arbitrary characters, which causes the application to become unresponsive or crash abnormally.

This vulnerability is classified under CWE-807, indicating that the application relies on untrusted inputs in a security decision, leading to the denial of service.

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Impact Analysis

The vulnerability can cause Pixel Studio to crash or become unresponsive when processing malformed input from the keyboard.

This results in a denial of service, meaning legitimate users may be unable to use the application until it is restarted.

Since the attack requires local access and no privileges or user interaction, an attacker with local access can disrupt availability of the application.

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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 Pixel Studio version 2.17 or earlier by providing malformed input through the keyboard interface.'}, {'type': 'paragraph', 'content': 'A practical detection method involves creating a test input file containing a payload of arbitrary characters (for example, 10 "A" characters) and then opening or processing this file with Pixel Studio 2.17 to observe if the application crashes or becomes unresponsive.'}, {'type': 'paragraph', 'content': 'Example command to create the test file on a Unix-like system:'}, {'type': 'list_item', 'content': 'echo "AAAAAAAAAA" > exp.txt'}, {'type': 'paragraph', 'content': 'Then, open or import this file in Pixel Studio 2.17 and monitor if the application crashes or hangs, indicating the presence of the vulnerability.'}] [3]

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Mitigation Strategies

Immediate mitigation steps include avoiding the use of Pixel Studio version 2.17 or earlier until a patch or update is available.

Restrict local access to the application to trusted users only, as the vulnerability requires local attacker interaction via keyboard input.

Monitor and educate users to avoid entering arbitrary or malformed input into the application.

Check for updates or patches from the vendor that address this denial of service vulnerability and apply them as soon as they become available.

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