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Security Advisories: MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLWpmN2gtN204NS13MnYy

Integer overflow in TFLite memory allocation

Impact

The TFLite code for allocating TFLiteIntArrays is vulnerable to an integer overflow issue:

int TfLiteIntArrayGetSizeInBytes(int size) {
  static TfLiteIntArray dummy;
  return sizeof(dummy) + sizeof(dummy.data[0]) * size;
}   

An attacker can craft a model such that the size multiplier is so large that the return value overflows the int datatype and becomes negative. In turn, this results in invalid value being given to malloc:

TfLiteIntArray* TfLiteIntArrayCreate(int size) {
  TfLiteIntArray* ret = (TfLiteIntArray*)malloc(TfLiteIntArrayGetSizeInBytes(size));
  ret->size = size; 
  return ret;
}

In this case, ret->size would dereference an invalid pointer.

Patches

We have patched the issue in GitHub commit 7c8cc4ec69cd348e44ad6a2699057ca88faad3e5.

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 members of the Aivul Team from Qihoo 360.

Permalink: https://github.com/advisories/GHSA-jf7h-7m85-w2v2
JSON: https://advisories.ecosyste.ms/api/v1/advisories/MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLWpmN2gtN204NS13MnYy
Source: GitHub Advisory Database
Origin: Unspecified
Severity: High
Classification: General
Published: almost 3 years ago
Updated: over 1 year ago

CVSS Score: 7.1
CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

Identifiers: GHSA-jf7h-7m85-w2v2, CVE-2021-29605
References:

• https://github.com/tensorflow/tensorflow/security/advisories/GHSA-jf7h-7m85-w2v2
• https://nvd.nist.gov/vuln/detail/CVE-2021-29605
• https://github.com/tensorflow/tensorflow/commit/7c8cc4ec69cd348e44ad6a2699057ca88faad3e5
• https://github.com/advisories/GHSA-jf7h-7m85-w2v2

Repository: https://github.com/tensorflow/tensorflow
Blast Radius: 34.6

Affected Packages