fix: confine nnUNet postprocessing pickle loads to the results directory (GHSA-8f32) - #9113
fix: confine nnUNet postprocessing pickle loads to the results directory (GHSA-8f32)#9113garciadias wants to merge 2 commits into
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Included review availability: Your plan provides up to 8 included reviews per hour; 5 remain after this review. 📝 WalkthroughWalkthroughThe nnU-Net postprocessing flow now confines configured pickle paths to the dataset results directory. It emits updated pickle warnings and a MONAI 1.7 Priority: ⬆️ High Estimated code review effort: 3 (Moderate) | ~25 minutes Severity of issue fixed: High Merge Risk: ⚪ Minimal · up to The added test coverage verifies the intended path-confinement behavior without introducing a current merge risk. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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In `@tests/apps/nnunet/test_nnunetv2_runner_command.py`:
- Line 255: Add a test covering an external or traversal some_plans_file while
postprocessing_file remains a valid path inside the results directory. Assert
that validation rejects the request before calling load_pickle or
apply_postprocessing_to_folder, using the existing nnUNet runner test helpers
and symbols.
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monai/apps/nnunet/nnunetv2_runner.pytests/apps/nnunet/test_nnunetv2_runner_command.py
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…ory (GHSA-8f32) predict_ensemble_postprocessing loads the nnUNet best_model_or_ensemble postprocessing_file with batchgenerators.load_pickle. That path is read from inference_information.json, which a dataset creator controls, so a crafted entry can point the pickle load at an attacker-chosen file - arbitrary code execution (see https://github.com/Project-MONAI/MONAI/security/advisories/GHSA-8f32-8649-rv87). Replace the warn-and-execute behaviour of Project-MONAI#9086 with path confinement: the postprocessing file must live inside the run's result directory (target_dir_base), otherwise the load is refused with a ValueError. The legitimate in-dir pickle - which is exactly what nnUNet writes - still loads. Signed-off-by: R. Garcia-Dias <rafaelagd@gmail.com>
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- tests/apps/nnunet/test_nnunetv2_runner_command.py: add regression test covering an external some_plans_file while postprocessing_file remains a valid path inside the results directory; assert validation rejects before load_pickle is called Signed-off-by: R. Garcia-Dias <rafaelagd@gmail.com>
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Addresses GHSA-8f32-8649-rv87 (nnUNetV2Runner unguarded
pickle.load).What
postprocessing_fileandsome_plans_filecome frominference_information.jsonand are unpickled bybatchgeneratorswithout validation, so a tampered file redirects an arbitrary pickle load._confine_to_dir()now resolves both viaos.path.realpathand requires them to stay inside the dataset results directory. AFutureWarningannounces thatMONAI_ALLOW_PICKLEbecomes mandatory in 1.7 — the gate itself is deferred there to avoid a hard break in this patch release.Why not
torch.load(weights_only=True)The file holds nnU-Net function references, not tensors —
weights_only=Truerejects it outright.Test changes
test_postprocessing_pickle_warns_on_untrusted_file→ now uses a real temp results dir, expects two warnings (trust + 1.7 FutureWarning)test_postprocessing_file_outside_results_dir_is_rejected(absolute escape)test_postprocessing_traversal_is_rejected(../traversal)Verification
os.system, absolute path,..traversal all confirmed blocked.tests/apps/nnunetsuite: 11/11 pass.black/ruff/ DCO clean.This is the 1.6.1 "complete fix" for GHSA-8f32, replacing the warning-only PR #9086.