CVE-2021-37645
Integer overflow due to conversion to unsigned in TensorFlow
Description
TensorFlow is an end-to-end open source platform for machine learning. In affected versions the implementation of `tf.raw_ops.QuantizeAndDequantizeV4Grad` is vulnerable to an integer overflow issue caused by converting a signed integer value to an unsigned one and then allocating memory based on this value. The [implementation](https://github.com/tensorflow/tensorflow/blob/8d72537c6abf5a44103b57b9c2e22c14f5f49698/tensorflow/core/kernels/quantize_and_dequantize_op.cc#L126) uses the `axis` value as the size argument to `absl::InlinedVector` constructor. But, the constructor uses an unsigned type for the argument, so the implicit conversion transforms the negative value to a large integer. We have patched the issue in GitHub commit 96f364a1ca3009f98980021c4b32be5fdcca33a1. The fix will be included in TensorFlow 2.6.0. We will also cherrypick this commit on TensorFlow 2.5.1, and TensorFlow 2.4.3, as these are also affected and still in supported range.
How to fix CVE-2021-37645
To remediate CVE-2021-37645, upgrade the affected package to a fixed version below.
- —upgrade to 2.3.4 or later
- —upgrade to 2.4.3 or later
- —upgrade to 96f364a1ca3009f98980021c4b32be5fdcca33a1 or later
- —upgrade to 96f364a1ca3009f98980021c4b32be5fdcca33a1 or later
- —upgrade to 2.4.3 or later
- —upgrade to 96f364a1ca3009f98980021c4b32be5fdcca33a1 or later
- —upgrade to 2.4.3 or later
Is CVE-2021-37645 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, < 2.4.3
- from 0, < 96f364a1ca3009f98980021c4b32be5fdcca33a1 | >= 2.3.0, < 2.3.4, >= 2.4.0, < 2.4.3
- from 0, < 96f364a1ca3009f98980021c4b32be5fdcca33a1 | >= 2.3.0, < 2.3.4, >= 2.4.0, < 2.4.3
- from 0, < 2.4.3
- from 0, < 96f364a1ca3009f98980021c4b32be5fdcca33a1 | >= 2.3.0, < 2.3.4, >= 2.4.0, < 2.4.3
- from 0, < 2.4.3
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N |
| osv | CVSS 3.1 | MEDIUM5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |