CVE-2021-29532 — Heap out of bounds read in `RaggedCross`

Affected: tensorflow

TensorFlow is an end-to-end open source platform for machine learning. An attacker can force accesses outside the bounds of heap allocated arrays by passing in invalid tensor values to `tf.raw_ops.RaggedCross`. This is because the implementation(https://github.com/tensorflow/tensorflow/blob/efea03b38fb8d3b81762237dc85e579cc5fc6e87/tensorflow/core/kernels/ragged_cross_op.cc#L456-L487) lacks validation for the user supplied arguments. Each of the above branches call a helper function after accessing array elements via a `*_list[next_*]` pattern, followed by incrementing the `next_*` index. However, as there is no validation that the `next_*` values are in the valid range for the corresponding `*_list` arrays, this results in heap OOB reads. The fix will be included in TensorFlow 2.5.0. We will also cherrypick this commit on TensorFlow 2.4.2, TensorFlow 2.3.3, TensorFlow 2.2.3 and TensorFlow 2.1.4, as these are also affected and still in supported range.

GHSA-j47f-4232-hvv8 — Heap out of bounds read in `RaggedCross`

Affected: PyPI: tensorflow, PyPI: tensorflow-cpu, PyPI: tensorflow-gpu

### Impact An attacker can force accesses outside the bounds of heap allocated arrays by passing in invalid tensor values to `tf.raw_ops.RaggedCross`:

```python import tensorflow as tf

ragged_values = [] ragged_row_splits = [] sparse_indices = [] sparse_values = [] sparse_shape = []

dense_inputs_elem = tf.constant([], shape=[92, 0], dtype=tf.int64) dense_inputs = [dense_inputs_elem]

input_order = "R" hashed_output = False num_buckets = 0 hash_key = 0

tf.raw_ops.RaggedCross(ragged_values=ragged_values, ragged_row_splits=ragged_row_splits, sparse_indices=sparse_indices, sparse_values=sparse_values, sparse_shape=sparse_shape, dense_inputs=dense_inputs, input_order=input_order, hashed_output=hashed_output, num_buckets=num_buckets, hash_key=hash_key, out_values_type=tf.int64, out_row_splits_type=tf.int64) ```

This is because the [implementation](https://github.com/tensorflow/tensorflow/blob/efea03b38fb8d3b81762237dc85e579cc5fc6e87/tensorflow/core/kernels/ragged_cross_op.cc#L456-L487) lacks validation for the user supplied arguments:

```cc int next_ragged = 0; int next_sparse = 0; int next_dense = 0; for (char c : input_order_) { if (c == 'R') { TF_RETURN_IF_ERROR(BuildRaggedFeatureReader( ragged_values_list[next_ragged], ragged_splits_list[next_ragged], features)); next_ragged++; } else if (c == 'S') { TF_RETURN_IF_ERROR(BuildSparseFeatureReader( sparse_indices_list[next_sparse], sparse_v…

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CVE-2021-29532 — Heap out of bounds read in `RaggedCross`

GHSA-j47f-4232-hvv8 — Heap out of bounds read in `RaggedCross`