Potential fix for code scanning alert no. 1: Uncontrolled data used in path expression #15
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…n path expression Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>
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| throw new UnauthorizedAccessException("Invalid file path."); | ||
| } | ||
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| using (FileStream fs = File.Open(filePath, FileMode.Open)) |
Check failure
Code scanning / CodeQL
Uncontrolled data used in path expression High
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Copilot Autofix
AI 7 months ago
To fix the issue, we will enhance the validation of userInput to ensure it does not contain any path traversal sequences (e.g., .., /, or \). This will be done before combining it with the base directory. Additionally, we will ensure that the filePath remains within the baseDirectory after normalization. This two-step validation approach will provide a more robust safeguard against path traversal attacks.
Steps to implement the fix:
- Add a check to reject
userInputif it contains any path traversal sequences (..,/, or\). - Retain the existing check to ensure that the resolved
filePathstarts with thebaseDirectory. - Throw an exception or return an error response if the validation fails.
Suggested changeset
1
albums-api/Controllers/UnsecuredController.cs
| @@ -13,2 +13,8 @@ | ||
| string baseDirectory = Path.GetFullPath("SafeDirectory"); // Define a safe base directory | ||
| // Validate userInput to ensure it does not contain path traversal sequences | ||
| if (userInput.Contains("..") || userInput.Contains("/") || userInput.Contains("\\")) | ||
| { | ||
| throw new UnauthorizedAccessException("Invalid file path."); | ||
| } | ||
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| string filePath = Path.GetFullPath(Path.Combine(baseDirectory, userInput)); // Combine and normalize the path |
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Potential fix for https://github.com/geovanams/DemoGHASBOX/security/code-scanning/1
To fix the issue, we need to validate the
userInputparameter to ensure it does not contain any malicious path components (e.g.,..,/, or\) that could lead to path traversal attacks. Additionally, we should restrict file access to a specific directory to ensure that even valid file names cannot access files outside the intended directory.The fix involves:
Suggested fixes powered by Copilot Autofix. Review carefully before merging.