CVE-2021-29558 — Heap buffer overflow in `SparseSplit`

Affected: tensorflow

TensorFlow is an end-to-end open source platform for machine learning. An attacker can cause a heap buffer overflow in `tf.raw_ops.SparseSplit`. This is because the implementation(https://github.com/tensorflow/tensorflow/blob/699bff5d961f0abfde8fa3f876e6d241681fbef8/tensorflow/core/util/sparse/sparse_tensor.h#L528-L530) accesses an array element based on a user controlled offset. 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-mqh2-9wrp-vx84 — Heap buffer overflow in `SparseSplit`

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

### Impact An attacker can cause a heap buffer overflow in `tf.raw_ops.SparseSplit`:

```python import tensorflow as tf

shape_dims = tf.constant(0, dtype=tf.int64) indices = tf.ones([1, 1], dtype=tf.int64) values = tf.ones([1], dtype=tf.int64) shape = tf.ones([1], dtype=tf.int64)

tf.raw_ops.SparseSplit( split_dim=shape_dims, indices=indices, values=values, shape=shape, num_split=1) ```

This is because the [implementation](https://github.com/tensorflow/tensorflow/blob/699bff5d961f0abfde8fa3f876e6d241681fbef8/tensorflow/core/util/sparse/sparse_tensor.h#L528-L530) accesses an array element based on a user controlled offset:

```cc const int dim = input_tensor.indices().matrix<int64>()(i, split_dim); int slice_index = GetSliceIndex(dim, split_size, residual); num_values[slice_index]++; ```

This results in overriding values on the heap.

### Patches We have patched the issue in GitHub commit [8ba6fa29cd8bf9cef9b718dc31c78c73081f5b31](https://github.com/tensorflow/tensorflow/commit/8ba6fa29cd8bf9cef9b718dc31c78c73081f5b31).

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.

### For more information Please consult [our security guide](https://github.com/tensorflow/tensorflow/blob/master/SECURITY.md) for more information regarding the security model and how to contact us with issues and questions.

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CVE-2021-29558 — Heap buffer overflow in `SparseSplit`

GHSA-mqh2-9wrp-vx84 — Heap buffer overflow in `SparseSplit`