Executive Summary

[{'type': 'paragraph', 'content': "MSN Password Recovery version 1.30 contains a denial of service (DoS) vulnerability caused by a buffer overflow. This happens because the application does not properly check the size of the input in the 'User Name and Registration Code' field."}, {'type': 'paragraph', 'content': 'An attacker can supply an oversized input, specifically a 9000-byte buffer of repeated characters, which causes the application to crash when processing this input.'}, {'type': 'paragraph', 'content': 'This vulnerability is classified under CWE-120 (Buffer Copy without Checking Size of Input), indicating a classic buffer overflow issue.'}] [1, 2]

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Impact Analysis

The primary impact of this vulnerability is a denial of service condition where the MSN Password Recovery application crashes and becomes unavailable.

An attacker with local access and the ability to interact with the user interface can trigger this crash by inputting a specially crafted oversized registration code.

This can disrupt normal use of the application, potentially preventing legitimate users from recovering passwords until the application is restarted or fixed.

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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 MSN Password Recovery version 1.30 application. Specifically, an oversized input of 9000 repeated characters can be supplied to the 'User Name and Registration Code' field to trigger the crash."}, {'type': 'list_item', 'content': "Generate a file containing 9000 repeated characters (e.g., 'A')."}, {'type': 'list_item', 'content': 'Copy the contents of this file to the clipboard.'}, {'type': 'list_item', 'content': "Launch MSN Password Recovery 1.30 and paste the contents into the 'User Name and Registration Code' input field."}, {'type': 'list_item', 'content': "Click 'OK' and observe if the application crashes, indicating the presence of the vulnerability."}] [2]

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Mitigation Strategies

Immediate mitigation steps include avoiding the use of MSN Password Recovery version 1.30 or restricting access to it, as the vulnerability requires local user interaction to trigger.

Since the vulnerability is triggered by oversized input in the registration code field, do not allow untrusted users to interact with the application or input data into this field.

Monitor and control local access to the system running MSN Password Recovery to prevent exploitation.

Check for any updates or patches from the vendor that address this buffer overflow vulnerability and apply them as soon as they become available.

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