Vulnerability · Published Aug 12, 2021 · Assigned by GitHub_M
CVE-2021-37651Heap buffer overflow in `FractionalAvgPoolGrad` in TensorFlow
High 7.1
In plain English
A high-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 the implementation for `tf.raw_ops.FractionalAvgPoolGrad` can be tricked into accessing data outside of bounds of heap allocated buffers. The [implementation](https://github.com/tensorflow/tensorflow/blob/f24faa153ad31a4b51578f8181d3aaab77a1ddeb/tensorflow/core/kernels/fractional_avg_pool_op.cc#L205) does not validate that the input tensor is non-empty. Thus, code constructs an empty `EigenDoubleMatrixMap` and then accesses this buffer with indices that are outside of the empty area. We have patched the issue in GitHub commit 0f931751fb20f565c4e94aa6df58d54a003cdb30. 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-2021-273 |
| PyPI | tensorflow | 2.3.4 | GHSA-hpv4-7p9c-mvfr |
| PyPI | tensorflow | 2.4.3 | GHSA-hpv4-7p9c-mvfr |
| PyPI | tensorflow | 2.5.1 | GHSA-hpv4-7p9c-mvfr |
| PyPI | tensorflow-cpu | 2.4.3 | GHSA-hpv4-7p9c-mvfr |
| PyPI | tensorflow-cpu | 2.3.4, 2.4.3 | PYSEC-2021-564 |
| PyPI | tensorflow-cpu | 2.3.4 | GHSA-hpv4-7p9c-mvfr |
| PyPI | tensorflow-cpu | 2.5.1 | GHSA-hpv4-7p9c-mvfr |
| PyPI | tensorflow-gpu | 2.3.4, 2.4.3 | PYSEC-2021-762 |
| PyPI | tensorflow-gpu | 2.3.4 | GHSA-hpv4-7p9c-mvfr |
| PyPI | tensorflow-gpu | 2.4.3 | GHSA-hpv4-7p9c-mvfr |
| PyPI | tensorflow-gpu | 2.5.1 | GHSA-hpv4-7p9c-mvfr |
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:H/A:N