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42 lines
1.6 KiB
Markdown
42 lines
1.6 KiB
Markdown
## TFSA-2020-017: Abort due to invalid splits in RaggedCountSparseOutput
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### CVE Number
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CVE-2020-15199
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### Impact
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The `RaggedCountSparseOutput` does not validate that the input arguments form a
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valid ragged tensor. In particular, there is no validation that the `splits`
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tensor has the minimum required number of elements. Code uses this quantity to
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[initialize a different data
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structure](https://github.com/tensorflow/tensorflow/blob/0e68f4d3295eb0281a517c3662f6698992b7b2cf/tensorflow/core/kernels/count_ops.cc#L241-L244):
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```cc
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int num_batches = splits.NumElements() - 1;
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auto per_batch_counts = BatchedMap<W>(num_batches);
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```
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Since `BatchedMap` is equivalent to a vector, it needs to have at least one
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element to not be `nullptr`. If user passes a `splits` tensor that is empty or
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has exactly one element, we get a `SIGABRT` signal raised by the operating
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system.
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### Vulnerable Versions
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TensorFlow 2.3.0.
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### Patches
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We have patched the issue in
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[3cbb917b4714766030b28eba9fb41bb97ce9ee02](https://github.com/tensorflow/tensorflow/commit/3cbb917b4714766030b28eba9fb41bb97ce9ee02)
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and will release a patch release.
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We recommend users to upgrade to TensorFlow 2.3.1.
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### For more information
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Please consult [our security
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guide](https://github.com/tensorflow/tensorflow/blob/master/SECURITY.md) for
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more information regarding the security model and how to contact us with issues
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and questions.
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### Attribution
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This vulnerability has been discovered through a variant analysis of [a
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vulnerability reported by members of the Aivul Team from Qihoo
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360](https://github.com/tensorflow/tensorflow/blob/master/tensorflow/security/advisory/tfsa-2020-015.md).
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