Skip to content

Latest commit

 

History

History
47 lines (37 loc) · 1.82 KB

tfsa-2020-025.md

File metadata and controls

47 lines (37 loc) · 1.82 KB
Raw

TFSA-2020-025: Undefined behavior in dlpack.to_dlpack

CVE Number

CVE-2020-15191

Impact

If a user passes an invalid argument to dlpack.to_dlpack the expected validations will cause variables to bind to nullptr while setting a status variable to the error condition.

However, this status argument is not properly checked:

  dlm_tensor->dl_tensor.data = TFE_TensorHandleDevicePointer(h, status);
  dlm_tensor->dl_tensor.dtype = GetDlDataType(data_type, status);

Hence, code following these methods will bind references to null pointers:

  dlm_tensor->dl_tensor.shape = &(*shape_arr)[0];
  dlm_tensor->dl_tensor.strides = &(*stride_arr)[0];

This is undefined behavior and reported as an error if compiling with -fsanitize=null.

Vulnerable Versions

TensorFlow 2.2.0, 2.3.0.

Patches

We have patched the issue in 22e07fb204386768e5bcbea563641ea11f96ceb8 and will release a patch release for all affected versions.

We recommend users to upgrade to TensorFlow 2.2.1 or 2.3.1.

For more information

Please consult our security guide for more information regarding the security model and how to contact us with issues and questions.

Attribution

This vulnerability has been discovered through a variant analysis of a vulnerability reported by members of the Aivul Team from Qihoo 360.