BIT-tensorflow-2020-15191

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BIT-tensorflow-2020-15191

Summary: Undefined behavior in Tensorflow

Details: In Tensorflow before versions 2.2.1 and 2.3.1, if a user passes an invalid argument to `dlpack.to_dlpack` the expected validations will cause variables to bind to `nullptr` while setting a `status` variable to the error condition. However, this `status` argument is not properly checked. Hence, code following these methods will bind references to null pointers. This is undefined behavior and reported as an error if compiling with `-fsanitize=null`. The issue is patched in commit 22e07fb204386768e5bcbea563641ea11f96ceb8 and is released in TensorFlow versions 2.2.1, or 2.3.1.

References: http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00065.html, https://github.com/tensorflow/tensorflow/commit/22e07fb204386768e5bcbea563641ea11f96ceb8, https://github.com/tensorflow/tensorflow/releases/tag/v2.3.1, https://github.com/tensorflow/tensorflow/security/advisories/GHSA-q8qj-fc9q-cphr, https://nvd.nist.gov/vuln/detail/CVE-2020-15191