Vulnerability · Published Aug 12, 2021 · Assigned by GitHub_M
CVE-2021-37659Out of bounds read via null pointer dereference in TensorFlow
High 7.3
In plain English
A high-severity null pointer dereference in tensorflow from tensorflow. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 7% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
TensorFlow is an end-to-end open source platform for machine learning. In affected versions an attacker can cause undefined behavior via binding a reference to null pointer in all binary cwise operations that don't require broadcasting (e.g., gradients of binary cwise operations). The [implementation](https://github.com/tensorflow/tensorflow/blob/84d053187cb80d975ef2b9684d4b61981bca0c41/tensorflow/core/kernels/cwise_ops_common.h#L264) assumes that the two inputs have exactly the same number of elements but does not check that. Hence, when the eigen functor executes it triggers heap OOB reads and undefined behavior due to binding to nullptr. We have patched the issue in GitHub commit 93f428fd1768df147171ed674fee1fc5ab8309ec. The fix will be included in TensorFlow 2.6.0. We will also cherrypick this commit on TensorFlow 2.5.1, TensorFlow 2.4.3, and TensorFlow 2.3.4, as these are also affected and still in supported range.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| PyPI | tensorflow | 2.3.4, 2.4.3 | PYSEC-2021-281 |
| PyPI | tensorflow | 2.3.4 | GHSA-q3g3-h9r4-prrc |
| PyPI | tensorflow | 2.4.3 | GHSA-q3g3-h9r4-prrc |
| PyPI | tensorflow | 2.5.1 | GHSA-q3g3-h9r4-prrc |
| PyPI | tensorflow-cpu | 2.4.3 | GHSA-q3g3-h9r4-prrc |
| PyPI | tensorflow-cpu | 2.3.4, 2.4.3 | PYSEC-2021-572 |
| PyPI | tensorflow-cpu | 2.3.4 | GHSA-q3g3-h9r4-prrc |
| PyPI | tensorflow-cpu | 2.5.1 | GHSA-q3g3-h9r4-prrc |
| PyPI | tensorflow-gpu | 2.3.4, 2.4.3 | PYSEC-2021-770 |
| PyPI | tensorflow-gpu | 2.3.4 | GHSA-q3g3-h9r4-prrc |
| PyPI | tensorflow-gpu | 2.4.3 | GHSA-q3g3-h9r4-prrc |
| PyPI | tensorflow-gpu | 2.5.1 | GHSA-q3g3-h9r4-prrc |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| tensorflow | tensorflow | >= 2.5.0, < 2.5.1>= 2.4.0, < 2.4.3< 2.3.4 |
Weakness: CWE-476, CWE-125 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H