QID 982512

QID 982512: Python (pip) Security Update for tensorflow-gpu (GHSA-2gfx-95x2-5v3x)

Security update has been released for tensorflow,tensorflow-cpu,tensorflow-gpu to fix the vulnerability.

Note: The preceding description block is extracted directly from the security advisory. Using automation, we have attempted to clean and format it as much as possible without introducing additional issues.

An attacker can cause a heap buffer overflow in `QuantizedReshape` by passing in invalid thresholds for the quantization:

```python
import tensorflow as tf

tensor = tf.constant([], dtype=tf.qint32)
shape = tf.constant([], dtype=tf.int32)
input_min = tf.constant([], dtype=tf.float32)
input_max = tf.constant([], dtype=tf.float32)

tf.raw_ops.QuantizedReshape(tensor=tensor, shape=shape, input_min=input_min, input_max=input_max)
```

This is because the [implementation](https://github.com/tensorflow/tensorflow/blob/a324ac84e573fba362a5e53d4e74d5de6729933e/tensorflow/core/kernels/quantized_reshape_op.cc#L38-L55) assumes that the 2 arguments are always valid scalars and tries to access the numeric value directly:

```cc
const auto& input_min_float_tensor = ctx->input(2);
...
const float input_min_float = input_min_float_tensor.flat<float>()(0);
const auto& input_max_float_tensor = ctx->input(3);
...
const float input_max_float = input_max_float_tensor.flat<float>()(0);
```

However, if any of these tensors is empty, then `.flat<T>()` is an empty buffer and accessing the element at position 0 results in overflow.

  • CVSS V3 rated as High - 7.8 severity.
  • CVSS V2 rated as Medium - 4.6 severity.
  • Solution
    We have patched the issue in GitHub commit [a324ac84e573fba362a5e53d4e74d5de6729933e](https://github.com/tensorflow/tensorflow/commit/a324ac84e573fba362a5e53d4e74d5de6729933e).

    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.
    Vendor References

    CVEs related to QID 982512

    Software Advisories
    Advisory ID Software Component Link
    GHSA-2gfx-95x2-5v3x tensorflow URL Logo github.com/advisories/GHSA-2gfx-95x2-5v3x
    GHSA-2gfx-95x2-5v3x tensorflow-cpu URL Logo github.com/advisories/GHSA-2gfx-95x2-5v3x
    GHSA-2gfx-95x2-5v3x tensorflow-gpu URL Logo github.com/advisories/GHSA-2gfx-95x2-5v3x

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