Executive Summary

This vulnerability is a path traversal issue in the Signal K Server application prior to version 2.20.3. It affects the applicationData API and allows authenticated users on Windows systems to read, write, and list arbitrary files and directories outside the intended directory. The problem arises because the validateAppId() function blocks forward slashes (/) but not backslashes (\), which Windows treats as directory separators. This allows attackers to escape the intended applicationData directory and access other parts of the filesystem.

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Impact Analysis

This vulnerability can allow an authenticated user on a Windows system to access, modify, or list files and directories outside the intended applicationData directory. This could lead to unauthorized disclosure of sensitive information, modification of important files, or other unintended actions on the filesystem, potentially compromising the integrity and confidentiality of data on the system.

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Mitigation Strategies

Upgrade Signal K Server to version 2.20.3 or later, as this version contains the fix for the path traversal vulnerability. Additionally, restrict authenticated user permissions on Windows systems to limit access to the filesystem and monitor for any unusual file access patterns.

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