Vulnerability · Published Aug 12, 2021 · Assigned by GitHub_M
CVE-2021-37685Heap OOB in TensorFlow Lite
Medium 5.5
In plain English
A medium-severity out-of-bounds read 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 TFLite's [`expand_dims.cc`](https://github.com/tensorflow/tensorflow/blob/149562d49faa709ea80df1d99fc41d005b81082a/tensorflow/lite/kernels/expand_dims.cc#L36-L50) contains a vulnerability which allows reading one element outside of bounds of heap allocated data. If `axis` is a large negative value (e.g., `-100000`), then after the first `if` it would still be negative. The check following the `if` statement will pass and the `for` loop would read one element before the start of `input_dims.data` (when `i = 0`). We have patched the issue in GitHub commit d94ffe08a65400f898241c0374e9edc6fa8ed257. 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-2021-307 |
| PyPI | tensorflow | 2.3.4 | GHSA-c545-c4f9-rf6v |
| PyPI | tensorflow | 2.4.3 | GHSA-c545-c4f9-rf6v |
| PyPI | tensorflow | 2.5.1 | GHSA-c545-c4f9-rf6v |
| PyPI | tensorflow-cpu | 2.4.3 | GHSA-c545-c4f9-rf6v |
| PyPI | tensorflow-cpu | 2.3.4, 2.4.3 | PYSEC-2021-598 |
| PyPI | tensorflow-cpu | 2.3.4 | GHSA-c545-c4f9-rf6v |
| PyPI | tensorflow-cpu | 2.5.1 | GHSA-c545-c4f9-rf6v |
| PyPI | tensorflow-gpu | 2.3.4, 2.4.3 | PYSEC-2021-796 |
| PyPI | tensorflow-gpu | 2.3.4 | GHSA-c545-c4f9-rf6v |
| PyPI | tensorflow-gpu | 2.4.3 | GHSA-c545-c4f9-rf6v |
| PyPI | tensorflow-gpu | 2.5.1 | GHSA-c545-c4f9-rf6v |
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-125 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N