CVE-2021-37649

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.

How to fix CVE-2021-37649

To remediate CVE-2021-37649, upgrade the affected package to a fixed version below.

—upgrade to 2.3.4 or later
—upgrade to 2.3.4 or later
—upgrade to 7bdf50bb4f5c54a4997c379092888546c97c3ebd or later
—upgrade to 7bdf50bb4f5c54a4997c379092888546c97c3ebd or later
—upgrade to 2.3.4 or later
—upgrade to 7bdf50bb4f5c54a4997c379092888546c97c3ebd or later
—upgrade to 2.3.4 or later

Is CVE-2021-37649 being exploited?

Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.

Affected packages (7)

>= 2.3.0, < 2.3.4, >= 2.4.0, < 2.4.3, >= 2.5.0, < 2.5.1
from 0, < 2.3.4
from 0, < 7bdf50bb4f5c54a4997c379092888546c97c3ebd | >= 2.3.0, < 2.3.4, >= 2.4.0, < 2.4.3
from 0, < 7bdf50bb4f5c54a4997c379092888546c97c3ebd | >= 2.3.0, < 2.3.4, >= 2.4.0, < 2.4.3
from 0, < 2.3.4
from 0, < 7bdf50bb4f5c54a4997c379092888546c97c3ebd | >= 2.3.0, < 2.3.4, >= 2.4.0, < 2.4.3
from 0, < 2.3.4

CVSS scores

Source	Version	Severity	Vector
osv	CVSS 4.0	—	CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
osv	CVSS 3.1	HIGH7.7	CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H