Path Traversal on File Download
February 6, 2024

Our second vulnerability is a directory traversal inside the Datasets class within the _download_external_files method. An attacker can upload or modify a dataset containing a link pointing to a file they want to drop and the path they want to write it to on the user’s system. When a user interacts with this dataset, it triggers the download, such as when using the Dataset.squash method. The uploaded file will be written to the user’s file system at the attacker-specified location. An important note is that the external link can point to a local file by using file://, the implication being that this introduces the potential for sensitive local files to be moved to externally accessible directories.
ClearML Server
The ClearML Server is a central hub for managing projects, datasets, tasks, and more. It consists of multiple components, including an API server that users can connect to via a client to perform tasks; a web server that users can connect to via a web UI to perform tasks; a fileserver where relevant files, such as artifacts and models, are stored by default; and a MongoDB instance, that stores authentication information, among other items.

Figure 1: ClearML Server Components
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