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Security Advisories: MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLTc5ZnYtOTg2NS00cWN2

Heap buffer overflow in `MaxPoolGrad`

Impact

The implementation of tf.raw_ops.MaxPoolGrad is vulnerable to a heap buffer overflow:

import tensorflow as tf

orig_input = tf.constant([0.0], shape=[1, 1, 1, 1], dtype=tf.float32)
orig_output = tf.constant([0.0], shape=[1, 1, 1, 1], dtype=tf.float32)
grad = tf.constant([], shape=[0, 0, 0, 0], dtype=tf.float32)
ksize = [1, 1, 1, 1] 
strides = [1, 1, 1, 1]
padding = "SAME"

tf.raw_ops.MaxPoolGrad(
  orig_input=orig_input, orig_output=orig_output, grad=grad, ksize=ksize,
  strides=strides, padding=padding, explicit_paddings=[])

The implementation fails to validate that indices used to access elements of input/output arrays are valid:

for (int index = out_start; index < out_end; ++index) {
  int input_backprop_index = out_arg_max_flat(index);
  FastBoundsCheck(input_backprop_index - in_start, in_end - in_start);
  input_backprop_flat(input_backprop_index) += out_backprop_flat(index);
}

Whereas accesses to input_backprop_flat are guarded by FastBoundsCheck, the indexing in out_backprop_flat can result in OOB access.

Patches

We have patched the issue in GitHub commit a74768f8e4efbda4def9f16ee7e13cf3922ac5f7.

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

Attribution

This vulnerability has been reported by Ying Wang and Yakun Zhang of Baidu X-Team.

Permalink: https://github.com/advisories/GHSA-79fv-9865-4qcv
JSON: https://advisories.ecosyste.ms/api/v1/advisories/MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLTc5ZnYtOTg2NS00cWN2
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Low
Classification: General
Published: almost 3 years ago
Updated: about 1 year ago

CVSS Score: 2.5
CVSS vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L

Identifiers: GHSA-79fv-9865-4qcv, CVE-2021-29579
References:

• https://github.com/tensorflow/tensorflow/security/advisories/GHSA-79fv-9865-4qcv
• https://nvd.nist.gov/vuln/detail/CVE-2021-29579
• https://github.com/tensorflow/tensorflow/commit/a74768f8e4efbda4def9f16ee7e13cf3922ac5f7
• https://github.com/advisories/GHSA-79fv-9865-4qcv

Repository: https://github.com/tensorflow/tensorflow
Blast Radius: 12.2

Affected Packages