CVE-2021-37692: Segfault on strings tensors with mistmatched dimensions in TensorFlow
First published: Thu Aug 12 2021(Updated: )
### Impact Under certain conditions, Go code can trigger a segfault in string deallocation. For string tensors, `C.TF_TString_Dealloc` is called during garbage collection within a finalizer function. However, tensor structure isn't checked until encoding to avoid a performance penalty. The current method for dealloc assumes that encoding succeeded, but segfaults when a string tensor is garbage collected whose encoding failed (e.g., due to mismatched dimensions). To fix this, the call to set the finalizer function is deferred until `NewTensor` returns and, if encoding failed for a string tensor, deallocs are determined based on bytes written. ### Patches We have patched the issue in GitHub commit [8721ba96e5760c229217b594f6d2ba332beedf22](https://github.com/tensorflow/tensorflow/commit/8721ba96e5760c229217b594f6d2ba332beedf22) (merging [#50508](https://github.com/tensorflow/tensorflow/pull/50508)). The fix will be included in TensorFlow 2.6.0. We will also cherrypick this commit on TensorFlow 2.5.1, which is the other affected version. ### For more information Please consult [our security guide](https://github.com/tensorflow/tensorflow/blob/master/SECURITY.md) for more information regarding the security model and how to contact us with issues and questions. ### Attribution This vulnerability has been reported externally via a [fixing PR](https://github.com/tensorflow/tensorflow/pull/50508).
Credit: security-advisories@github.com security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Google TensorFlow | >=2.5.0<2.6.0 | |
| pip/tensorflow-gpu | >=2.5.0rc0<2.5.1 | 2.5.1 |
| pip/tensorflow-cpu | >=2.5.0rc0<2.5.1 | 2.5.1 |
| pip/tensorflow | >=2.5.0rc0<2.5.1 | 2.5.1 |
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Reference Links
- https://github.com/tensorflow/tensorflow/commit/8721ba96e5760c229217b594f6d2ba332beedf22
- https://github.com/tensorflow/tensorflow/pull/50508
- https://github.com/tensorflow/tensorflow/security/advisories/GHSA-cmgw-8vpc-rc59
- https://nvd.nist.gov/vuln/detail/CVE-2021-37692
- https://github.com/pypa/advisory-database/tree/main/vulns/tensorflow-cpu/PYSEC-2021-605.yaml
- https://github.com/pypa/advisory-database/tree/main/vulns/tensorflow-gpu/PYSEC-2021-803.yaml
- https://github.com/pypa/advisory-database/tree/main/vulns/tensorflow/PYSEC-2021-314.yaml
- https://github.com/advisories/GHSA-cmgw-8vpc-rc59 (Advisory)
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