mktemp: Prevent race condition when setting permissions for tempdir #7617
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please add a comment in the code, thanks |
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I Have tried to add what I think could be a relevant comment, any feedback is welcomed 😃. |
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Sorry but please also add a test to verify that the permissions are correctly set |
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I believe that this test already covers this |
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This prevents a race conditions vulnerability in the tempdir implementation, where an attacker potentially could modify the created temporary directory, before the restrictive permissions are set. The race conditions occurs in the moment between the temporary directory is created, and the proper permissions are set. # The fix This patch changes the `make_temp_dir` to create the temporary directory with the proper permissions creation time. Rather than first create, then set permissions. This is done by giving the permissions to the builder. See [tempfile doc](https://github.com/Stebalien/tempfile/blob/95540ed3fcb9ca74845c02aee058726b2dca58b7/src/lib.rs#L449-L450). # Severity Low The attack is only possible if the umask is configured to allow writes by group or other for created file/directories. # Related Resources See: https://cwe.mitre.org/data/definitions/377.html
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This prevents a race conditions vulnerability in the
make_temp_dirimplementation, where an attacker potentially could modify the created temporary directory, before the restrictive permissions are set.The race conditions occurs in the moment between the temporary directory is created, and the proper permissions are set.
The fix
This patch changes the
make_temp_dirto create the temporary directory with the proper permissions creation time. Rather than first create, then set permissions. This is done by giving the permissions to the builder. See tempfile doc.Severity Low
The attack is only possible if the umask is configured to allow writes by group or other for newly created files/directories.
Related Resources
See: https://cwe.mitre.org/data/definitions/377.html