Vulnerability · Published May 14, 2021 · Assigned by GitHub_M

CVE-2021-29593Division by zero in TFLite's implementation of `BatchToSpaceNd`

Low 2.5

In plain English

A low-severity security flaw 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 10% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)2.5Low

Exploit odds (30 days)0.2%top 89.9% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official description

TensorFlow is an end-to-end open source platform for machine learning. The implementation of the `BatchToSpaceNd` TFLite operator is vulnerable to a division by zero error(https://github.com/tensorflow/tensorflow/blob/b5ed552fe55895aee8bd8b191f744a069957d18d/tensorflow/lite/kernels/batch_to_space_nd.cc#L81-L82). An attacker can craft a model such that one dimension of the `block` input is 0. Hence, the corresponding value in `block_shape` is 0. The fix will be included in TensorFlow 2.5.0. We will also cherrypick this commit on TensorFlow 2.4.2, TensorFlow 2.3.3, TensorFlow 2.2.3 and TensorFlow 2.1.4, as these are also affected and still in supported range.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
PyPI	tensorflow	2.3.3	GHSA-cfx7-2xpc-8w4h
PyPI	tensorflow	2.4.2	GHSA-cfx7-2xpc-8w4h
PyPI	tensorflow	2.1.4	GHSA-cfx7-2xpc-8w4h
PyPI	tensorflow	2.1.4, 2.2.3, 2.3.3, 2.4.2	PYSEC-2021-230
PyPI	tensorflow	2.2.3	GHSA-cfx7-2xpc-8w4h
PyPI	tensorflow-cpu	2.4.2	GHSA-cfx7-2xpc-8w4h
PyPI	tensorflow-cpu	2.1.4	GHSA-cfx7-2xpc-8w4h
PyPI	tensorflow-cpu	2.2.3	GHSA-cfx7-2xpc-8w4h
PyPI	tensorflow-cpu	2.3.3	GHSA-cfx7-2xpc-8w4h
PyPI	tensorflow-cpu	2.1.4, 2.2.3, 2.3.3, 2.4.2	PYSEC-2021-521
PyPI	tensorflow-gpu	2.3.3	GHSA-cfx7-2xpc-8w4h
PyPI	tensorflow-gpu	2.4.2	GHSA-cfx7-2xpc-8w4h
PyPI	tensorflow-gpu	2.1.4	GHSA-cfx7-2xpc-8w4h
PyPI	tensorflow-gpu	2.1.4, 2.2.3, 2.3.3, 2.4.2	PYSEC-2021-719
PyPI	tensorflow-gpu	2.2.3	GHSA-cfx7-2xpc-8w4h

Affected products (as reported)

Vendor	Product	Versions
tensorflow	tensorflow	< 2.1.4>= 2.2.0, < 2.2.3>= 2.3.0, < 2.3.3>= 2.4.0, < 2.4.2

Weakness: CWE-369 · Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L

References

https://github.com/tensorflow/tensorflow/security/advisories/GHSA-cfx7-2xpc-8w4h x_refsource_CONFIRM
https://github.com/tensorflow/tensorflow/commit/2c74674348a4708ced58ad6eb1b23354df8ee044 x_refsource_MISC