Executive Summary

CVE-2019-25593 is a denial of service vulnerability in jetCast Server version 2.0. It occurs because the application does not properly validate the length of input supplied in the Log directory configuration field.

A local attacker can supply an excessively long string—specifically a buffer of 5000 characters—into this Log directory field. When the server process is started with this input, it causes a buffer overflow that crashes the application, terminating the server process.

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Impact Analysis

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

An attacker with local access can exploit this by inputting a very long string into the Log directory configuration, causing the server to terminate unexpectedly.

The impact is that the service provided by the jetCast Server becomes unavailable until it is restarted, potentially disrupting operations that depend on it.

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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 crash condition on the jetCast Server 2.0 application by supplying an excessively long string in the Log directory configuration field.'}, {'type': 'list_item', 'content': 'Run the provided Python script `jetCast_Server_2.0.py` to generate a test input file.'}, {'type': 'list_item', 'content': 'Open the generated file `jetCast.txt` and copy its contents (a 5000-character string).'}, {'type': 'list_item', 'content': 'Launch the jetCast Server application.'}, {'type': 'list_item', 'content': 'Navigate to the "Config" menu.'}, {'type': 'list_item', 'content': 'Paste the copied 5000-character string into the "Log directory" field.'}, {'type': 'list_item', 'content': 'Click "Ok" and then "Start" to initiate the server.'}, {'type': 'paragraph', 'content': 'If the application crashes or terminates unexpectedly, the vulnerability is present.'}] [1]

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Mitigation Strategies

Immediate mitigation steps include avoiding the use of excessively long strings in the Log directory configuration field of jetCast Server 2.0.

Restrict local user access to the jetCast Server configuration to prevent attackers from supplying malicious input.

Monitor the application for crashes and restart the server if it terminates unexpectedly.

Consider applying any available patches or updates from the vendor once released.

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