CVE-2021-37681
The implementation of SVDF in TFLite is vulnerable to a null pointer error:
TfLiteTensor* state = GetVariableInput(context, node, kStateTensor);
// ...
GetTensorData<float>(state)
The GetVariableInput
function
can return a null pointer but GetTensorData
assumes that the argument is
always a valid tensor.
TfLiteTensor* GetVariableInput(TfLiteContext* context, const TfLiteNode* node,
int index) {
TfLiteTensor* tensor = GetMutableInput(context, node, index);
return tensor->is_variable ? tensor : nullptr;
}
Furthermore, because GetVariableInput
calls
GetMutableInput
which might return nullptr
, the tensor->is_variable
expression can also
trigger a null pointer exception.
We have patched the issue in GitHub commit 5b048e87e4e55990dae6b547add4dae59f4e1c76.
The fix will be included in TensorFlow 2.6.0. We will also cherrypick this commit on TensorFlow 2.5.1, TensorFlow 2.4.3, and TensorFlow 2.3.4, as these are also affected and still in supported range.
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This vulnerability has been reported by members of the Aivul Team from Qihoo 360.