Executive Summary

CVE-2019-25546 is a buffer overflow vulnerability found in NetAware version 1.20, specifically in the Share Name field of the application.

Local attackers can exploit this flaw by supplying an excessively long string—such as a 1000-byte buffer—when adding a new share through the Manage Shares interface.

This causes the application to crash due to an out-of-bounds write, resulting in a denial of service condition.

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Impact Analysis

This vulnerability allows local attackers to cause a denial of service by crashing the NetAware 1.20 application.

By triggering the buffer overflow in the Share Name field, normal operation of the application is disrupted, potentially affecting availability.

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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 buffer overflow condition in the Share Name field of the NetAware 1.20 application. Specifically, by supplying an excessively long string (such as a 1000-byte buffer) into the Share Name parameter when adding a new share through the Manage Shares interface, you can observe if the application crashes, indicating the presence of the vulnerability.'}, {'type': 'paragraph', 'content': 'A proof-of-concept method involves running a Python script that generates a file containing the exploit buffer, copying its contents, and pasting it into the Share Name field in the application. This process can be used as a test to detect the vulnerability.'}, {'type': 'list_item', 'content': "Run the Python script 'NetAware_share.py' to generate 'NetAware.txt' containing the 1000-byte buffer."}, {'type': 'list_item', 'content': "Copy the contents of 'NetAware.txt' to the clipboard."}, {'type': 'list_item', 'content': 'Open NetAware application and navigate to Manage Shares > Add a New Share.'}, {'type': 'list_item', 'content': 'Paste the copied buffer into the Share Name field.'}, {'type': 'list_item', 'content': "Enter any value in the Share Path field (e.g., 'test') and set the User Limit to the maximum allowed."}, {'type': 'list_item', 'content': "Click 'Ok' and observe if the application crashes, indicating the vulnerability."}] [3]

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Mitigation Strategies

Immediate mitigation steps include avoiding the input of excessively long strings into the Share Name field of NetAware 1.20 to prevent triggering the buffer overflow and subsequent denial of service.

Since the vulnerability requires local access to the application, restricting user permissions and limiting access to the Manage Shares interface can reduce the risk of exploitation.

Additionally, monitoring for application crashes related to the Manage Shares feature can help detect attempted exploitation.

It is also advisable to check for any available patches or updates from the vendor or consider upgrading to a version of NetAware that addresses this vulnerability.

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