FPE in `tf.raw_ops.UnravelIndex`

Impact

An attacker can cause denial of service in applications serving models using tf.raw_ops.UnravelIndex by triggering a division by 0:

import tensorflow as tf

tf.raw_ops.UnravelIndex(indices=-1, dims=[1,0,2])

The implementation does not check that the tensor subsumed by dims is not empty. Hence, if one element of dims is 0, the implementation does a division by 0.

Patches

We have patched the issue in GitHub commit a776040a5e7ebf76eeb7eb923bf1ae417dd4d233.

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.

For more information

Please consult our security guide for more information regarding the security model and how to contact us with issues and questions.

Attribution

This vulnerability has been reported by members of the Aivul Team from Qihoo 360.