Executive Summary

[{'type': 'paragraph', 'content': 'CVE-2026-25869 affects MiniGal Nano versions 0.3.5 and earlier and involves a path traversal vulnerability in the index.php file via the "dir" parameter.'}, {'type': 'paragraph', 'content': 'The application appends user-supplied input to the photos directory and tries to prevent directory traversal attacks by removing ".." sequences. However, this protection can be bypassed using specially crafted directory patterns.'}, {'type': 'paragraph', 'content': 'An attacker exploiting this flaw can cause the application to enumerate and display image files from arbitrary filesystem locations accessible by the web server, leading to unintended information disclosure.'}] [1]

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Impact Analysis

This vulnerability can lead to unintended information disclosure by allowing an attacker to access and display image files from filesystem locations that should not be accessible through the application.

Since the attacker can enumerate files outside the intended photos directory, sensitive or private images stored on the server might be exposed.

The vulnerability has a medium severity with a CVSS v4 base score of 6.9, and it can be exploited remotely without any privileges or user interaction.

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Compliance Impact

I don't know

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Detection Guidance

[{'type': 'paragraph', 'content': 'Detection of this vulnerability involves checking if the MiniGal Nano application version 0.3.5 or earlier is running and testing the index.php file\'s "dir" parameter for path traversal weaknesses.'}, {'type': 'paragraph', 'content': 'One way to detect exploitation attempts is to monitor web server logs for unusual requests to index.php with crafted "dir" parameter values that include directory traversal patterns or bypass attempts.'}, {'type': 'paragraph', 'content': 'Example commands to test the vulnerability manually include sending HTTP requests with crafted "dir" parameters to see if files outside the intended photos directory are accessible.'}, {'type': 'list_item', 'content': 'Using curl to test path traversal: curl -v "http://target-site/index.php?dir=.../.../etc/passwd"'}, {'type': 'list_item', 'content': 'Using curl with encoded traversal sequences to bypass filters: curl -v "http://target-site/index.php?dir=....//....//etc/passwd"'}, {'type': 'paragraph', 'content': 'Additionally, scanning tools or custom scripts can be used to automate detection by sending various crafted payloads to the "dir" parameter and analyzing responses for unintended file disclosures.'}] [1]

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Mitigation Strategies

[{'type': 'paragraph', 'content': 'Immediate mitigation steps include restricting access to the vulnerable MiniGal Nano application, especially the index.php file handling the "dir" parameter.'}, {'type': 'paragraph', 'content': 'If possible, upgrade MiniGal Nano to a version later than 0.3.5 where this vulnerability is fixed.'}, {'type': 'paragraph', 'content': 'As a temporary workaround, implement web server rules or application-level input validation to block or sanitize the "dir" parameter to prevent directory traversal patterns.'}, {'type': 'paragraph', 'content': 'Additionally, restrict filesystem permissions so that the web server user has minimal read access outside the intended photos directory to limit the impact of any exploitation.'}] [1]

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