Vulnerability · Published Aug 12, 2021 · Assigned by GitHub_M
CVE-2021-37681Null pointer exception in TensorFlow Lite
High 7.8
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 the implementation of SVDF in TFLite is [vulnerable to a null pointer error](https://github.com/tensorflow/tensorflow/blob/460e000de3a83278fb00b61a16d161b1964f15f4/tensorflow/lite/kernels/svdf.cc#L300-L313). The [`GetVariableInput` function](https://github.com/tensorflow/tensorflow/blob/460e000de3a83278fb00b61a16d161b1964f15f4/tensorflow/lite/kernels/kernel_util.cc#L115-L119) can return a null pointer but `GetTensorData` assumes that the argument is always a valid tensor. Furthermore, because `GetVariableInput` calls [`GetMutableInput`](https://github.com/tensorflow/tensorflow/blob/460e000de3a83278fb00b61a16d161b1964f15f4/tensorflow/lite/kernels/kernel_util.cc#L82-L90) which might return `nullptr`, the `tensor->is_variable` expression can also trigger a null pointer exception. We have patched the issue in GitHub commit 5b048e87e4e55990dae6b547add4dae59f4e1c76. 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-2021-303 |
| PyPI | tensorflow | 2.3.4 | GHSA-7xwj-5r4v-429p |
| PyPI | tensorflow | 2.4.3 | GHSA-7xwj-5r4v-429p |
| PyPI | tensorflow | 2.5.1 | GHSA-7xwj-5r4v-429p |
| PyPI | tensorflow-cpu | 2.4.3 | GHSA-7xwj-5r4v-429p |
| PyPI | tensorflow-cpu | 2.3.4, 2.4.3 | PYSEC-2021-594 |
| PyPI | tensorflow-cpu | 2.3.4 | GHSA-7xwj-5r4v-429p |
| PyPI | tensorflow-cpu | 2.5.1 | GHSA-7xwj-5r4v-429p |
| PyPI | tensorflow-gpu | 2.3.4, 2.4.3 | PYSEC-2021-792 |
| PyPI | tensorflow-gpu | 2.3.4 | GHSA-7xwj-5r4v-429p |
| PyPI | tensorflow-gpu | 2.4.3 | GHSA-7xwj-5r4v-429p |
| PyPI | tensorflow-gpu | 2.5.1 | GHSA-7xwj-5r4v-429p |
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 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H