Vulnerability · Published Aug 12, 2021 · Assigned by GitHub_M
CVE-2021-37649Null pointer dereference in `UncompressElement` in TensorFlow
High 7.7
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 5% 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. The code for `tf.raw_ops.UncompressElement` can be made to trigger a null pointer dereference. The [implementation](https://github.com/tensorflow/tensorflow/blob/f24faa153ad31a4b51578f8181d3aaab77a1ddeb/tensorflow/core/kernels/data/experimental/compression_ops.cc#L50-L53) obtains a pointer to a `CompressedElement` from a `Variant` tensor and then proceeds to dereference it for decompressing. There is no check that the `Variant` tensor contained a `CompressedElement`, so the pointer is actually `nullptr`. We have patched the issue in GitHub commit 7bdf50bb4f5c54a4997c379092888546c97c3ebd. 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-2021-271 |
| PyPI | tensorflow | 2.3.4 | GHSA-6gv8-p3vj-pxvr |
| PyPI | tensorflow | 2.4.3 | GHSA-6gv8-p3vj-pxvr |
| PyPI | tensorflow | 2.5.1 | GHSA-6gv8-p3vj-pxvr |
| PyPI | tensorflow-cpu | 2.4.3 | GHSA-6gv8-p3vj-pxvr |
| PyPI | tensorflow-cpu | 2.3.4, 2.4.3 | PYSEC-2021-562 |
| PyPI | tensorflow-cpu | 2.3.4 | GHSA-6gv8-p3vj-pxvr |
| PyPI | tensorflow-cpu | 2.5.1 | GHSA-6gv8-p3vj-pxvr |
| PyPI | tensorflow-gpu | 2.3.4, 2.4.3 | PYSEC-2021-760 |
| PyPI | tensorflow-gpu | 2.3.4 | GHSA-6gv8-p3vj-pxvr |
| PyPI | tensorflow-gpu | 2.4.3 | GHSA-6gv8-p3vj-pxvr |
| PyPI | tensorflow-gpu | 2.5.1 | GHSA-6gv8-p3vj-pxvr |
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:N/UI:N/S:U/C:N/I:H/A:H