contain JobOperations.download output paths within download_path

[nabhan06]

Description

JobOperations.download builds each output's local destination as download_path / "named-outputs" / item_name, where item_name is a job output name taken verbatim from the run-history service response (get_job_output_uris_from_dataplane -> run_metadata.outputs keys). A name containing .. climbs out of download_path, and an absolute name makes pathlib drop download_path entirely, so artifacts land in a directory the job author picked rather than the one the caller asked for. The blob/gen2/fileshare helpers already contain each blob relative to their destination, but that check runs against the already-escaped destination, so it can't stop this. The download loop now resolves each destination and skips any output whose path would fall outside download_path.

Added a unit test in test_job_operations.py that returns malicious output names from the service and asserts nothing is written outside download_path.

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[Copilot]

Pull request overview

This PR fixes a path-traversal vulnerability in JobOperations.download (sdk/ml/azure-ai-ml). Output names are taken verbatim from the run-history service response and used to build local destinations as download_path / "named-outputs" / item_name. A name containing .. segments or an absolute path could cause pathlib to place artifacts outside the caller-supplied download_path. The fix resolves each destination and skips any output that would fall outside download_path, and adds a unit test asserting malicious output names are not written outside the download directory.

Changes:

• Added a containment check in the download loop that resolves the destination and skips (with a warning) any output whose resolved path escapes download_path.
• Added test_download_skips_output_name_path_traversal verifying ..-based and absolute output names are skipped while the legitimate default/logs output is still downloaded.
• Added a CHANGELOG entry under the 1.35.0 (unreleased) Bugs Fixed section.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
sdk/ml/azure-ai-ml/azure/ai/ml/operations/_job_operations.py	Adds resolve-and-contain check so outputs resolving outside download_path are skipped instead of escaping the directory.
sdk/ml/azure-ai-ml/tests/job_common/unittests/test_job_operations.py	New unit test returning malicious output names and asserting nothing is written outside download_path.
sdk/ml/azure-ai-ml/CHANGELOG.md	Documents the bug fix under 1.35.0 (unreleased) Bugs Fixed.

The fix is correct and well-targeted: download_path is normalized to a Path earlier in the method (line 994), the containment check uses resolve() on both sides (correctly collapsing .. and normalizing absolute overrides and symlinks), and the batch/default branches are not vulnerable since they use fixed directory names rather than the untrusted item_name. The test's mocked status (JobStatus.COMPLETED) is a valid terminal status, the mocks bypass unrelated code paths correctly, and the assertions cover both the traversal and absolute-path cases plus the legitimate download. No async duplicate of this logic exists that would need the same change.