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1## TFSA-2021-086: Division by zero in TFLite's implementation of `SVDF`
2
3### CVE Number
4CVE-2021-29598
5
6### Impact
7The implementation of the `SVDF` TFLite operator is [vulnerable to a
8division by zero
9error](https://github.com/tensorflow/tensorflow/blob/7f283ff806b2031f407db64c4d3edcda8fb9f9f5/tensorflow/lite/kernels/svdf.cc#L99-L102):
10
11```cc
12const int rank = params->rank;
13...
14TF_LITE_ENSURE_EQ(context, num_filters % rank, 0);
15```
16
17An attacker can craft a model such that `params->rank` would be 0.
18
19### Patches
20We have patched the issue in GitHub commit
21[6841e522a3e7d48706a02e8819836e809f738682](https://github.com/tensorflow/tensorflow/commit/6841e522a3e7d48706a02e8819836e809f738682).
22
23The fix will be included in TensorFlow 2.5.0. We will also cherrypick this
24commit on TensorFlow 2.4.2, TensorFlow 2.3.3, TensorFlow 2.2.3 and TensorFlow
252.1.4, as these are also affected and still in supported range.
26
27### For more information
28Please consult [our security
29guide](https://github.com/tensorflow/tensorflow/blob/master/SECURITY.md) for
30more information regarding the security model and how to contact us with issues
31and questions.
32
33### Attribution
34This vulnerability has been reported by members of the Aivul Team from Qihoo
35360.
36