Executive Summary

CVE-2019-25552 is a denial of service (DoS) vulnerability in CEWE PHOTO SHOW version 6.4.3 and earlier. It occurs when an attacker submits an excessively long input string to the password field during the upload process. This large input causes the application to crash due to improper handling of large input buffers, effectively making the application unavailable.

The root cause is a buffer overflow condition triggered by pasting a large string of repeated characters into the password input, which the application fails to properly validate or limit.

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Impact Analysis

This vulnerability can impact you by causing the CEWE PHOTO SHOW application to crash, resulting in a denial of service. Attackers can exploit this by submitting a very long password input, which disrupts normal operation and prevents legitimate users from using the application.

The CVSS v4 base score of 8.7 indicates a high severity, with the attack requiring no privileges or user interaction and having a network attack vector. The impact is primarily on confidentiality, as indicated by the CVSS vector.

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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 CEWE PHOTO SHOW version 6.4.3 by submitting an excessively long string to the password field during the upload process.'}, {'type': 'paragraph', 'content': "A proof-of-concept exploit involves running a Python script that generates a file containing a large buffer of repeated characters (e.g., 5000 'A's), copying this buffer to the clipboard, and then pasting it into the password field of the application during upload to observe if the application crashes."}, {'type': 'list_item', 'content': 'Run the Python script "photoshow.py" to create a file "photoshow.txt" with a large buffer.'}, {'type': 'list_item', 'content': 'Copy the contents of "photoshow.txt" to the clipboard.'}, {'type': 'list_item', 'content': 'Open CEWE PHOTO SHOW 6.4.3 and click the "Upload" button.'}, {'type': 'list_item', 'content': 'Paste the clipboard content into the password field and check if the application crashes.'}] [3]

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Mitigation Strategies

Immediate mitigation steps include avoiding the use of CEWE PHOTO SHOW version 6.4.3 or earlier until a patch or update is available that properly handles large input buffers in the password field.

As a temporary measure, restrict or sanitize input to the password field to prevent excessively long strings from being submitted.

Monitor application usage and logs for unusual or repeated attempts to submit large password inputs that could indicate exploitation attempts.

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