Race Condition in Python's tempfile.TemporaryDirectory Cleanup

Executive Summary

This vulnerability is a race condition in Python's tempfile.TemporaryDirectory cleanup process. An attacker can replace a directory with a symbolic link during cleanup, causing files outside the temporary directory to be deleted or have permissions/file flags reset. This affects platforms where shutil.rmtree.avoids_symlink_attacks is false.

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Detection Guidance

To detect this vulnerability, check if your Python version is affected (3.10 through 3.16). Run 'python --version' to verify. Inspect applications using tempfile.TemporaryDirectory for unusual file deletions or permission changes during cleanup.

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Impact Analysis

An attacker could exploit this to delete important files outside the temporary directory or alter their permissions. This could lead to data loss, system instability, or unauthorized access to sensitive files, depending on the privileges of the process performing cleanup.

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Compliance Impact

This vulnerability could lead to unauthorized file deletion or permission changes, potentially violating data integrity and confidentiality requirements in GDPR and HIPAA. Compliance may be impacted if sensitive data is exposed or altered due to the race condition.

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Mitigation Strategies

Update Python to a patched version (3.10+ with fixes). If unable to update, avoid using tempfile.TemporaryDirectory in untrusted environments or implement custom cleanup logic that avoids race conditions.

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