id: PYSEC-2021-472
details: TensorFlow is an end-to-end open source platform for machine learning. An
  attacker can trigger a denial of service via a `CHECK`-fail in `tf.raw_ops.QuantizeAndDequantizeV4Grad`.
  This is because the implementation(https://github.com/tensorflow/tensorflow/blob/95078c145b5a7a43ee046144005f733092756ab5/tensorflow/core/kernels/quantize_and_dequantize_op.cc#L162-L163)
  does not validate the rank of the `input_*` tensors. In turn, this results in the
  tensors being passes as they are to `QuantizeAndDequantizePerChannelGradientImpl`(https://github.com/tensorflow/tensorflow/blob/95078c145b5a7a43ee046144005f733092756ab5/tensorflow/core/kernels/quantize_and_dequantize_op.h#L295-L306).
  However, the `vec<T>` method, requires the rank to 1 and triggers a `CHECK` failure
  otherwise. The fix will be included in TensorFlow 2.5.0. We will also cherrypick
  this commit on TensorFlow 2.4.2 as this is the only other affected version.
affected:
- package:
    name: tensorflow-cpu
    ecosystem: PyPI
    purl: pkg:pypi/tensorflow-cpu
  ranges:
  - type: GIT
    repo: https://github.com/tensorflow/tensorflow
    events:
    - introduced: "0"
    - fixed: 20431e9044cf2ad3c0323c34888b192f3289af6b
  - type: ECOSYSTEM
    events:
    - introduced: "0"
    - fixed: 2.2.0rc0
    - introduced: 2.2.0
    - fixed: 2.3.0rc0
    - introduced: 2.3.0
    - fixed: 2.3.4
    - introduced: 2.4.0
    - fixed: 2.4.3
  versions:
  - 1.15.0
  - 2.1.0
  - 2.1.1
  - 2.1.2
  - 2.1.3
  - 2.1.4
  - 2.2.0
  - 2.2.1
  - 2.2.2
  - 2.2.3
  - 2.3.0
  - 2.3.1
  - 2.3.2
  - 2.3.3
  - 2.4.0
  - 2.4.1
  - 2.4.2
references:
- type: FIX
  url: https://github.com/tensorflow/tensorflow/commit/20431e9044cf2ad3c0323c34888b192f3289af6b
- type: ADVISORY
  url: https://github.com/tensorflow/tensorflow/security/advisories/GHSA-6g85-3hm8-83f9
aliases:
- CVE-2021-29544
- GHSA-6g85-3hm8-83f9
modified: "2021-12-09T06:34:50.195889Z"
published: "2021-05-14T20:15:00Z"