CVE-2021-37649

Advisory

TensorFlow 2.3.4, 2.4.3, 2.5.1 and 2.6.0 include a fix for CVE-2021-37649: 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'. The Tensorflow team has patched the issue in GitHub commit 7bdf50bb4f5c54a4997c379092888546c97c3ebd.

Affected package

Affected versions

Fixed versions

Vulnerability changelog

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. See CVE-2021-37649.


CONFIRM:https://github.com/tensorflow/tensorflow/security/advisories/GHSA-6gv8-p3vj-pxvr: https://github.com/tensorflow/tensorflow/security/advisories/GHSA-6gv8-p3vj-pxvr
MISC:https://github.com/tensorflow/tensorflow/commit/7bdf50bb4f5c54a4997c379092888546c97c3ebd: https://github.com/tensorflow/tensorflow/commit/7bdf50bb4f5c54a4997c379092888546c97c3ebd

Resources

• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-37649
• https://github.com/tensorflow/tensorflow/commit/7bdf50bb4f5c54a4997c379092888546c97c3ebd
• https://github.com/tensorflow/tensorflow/security/advisories/GHSA-6gv8-p3vj-pxvr