CVE-2022-21727: Integer overflow in Tensorflow
First published: Thu Feb 03 2022(Updated: )
### Impact The [implementation of shape inference for `Dequantize`](https://github.com/tensorflow/tensorflow/blob/5100e359aef5c8021f2e71c7b986420b85ce7b3d/tensorflow/core/ops/array_ops.cc#L3001-L3034) is vulnerable to an integer overflow weakness: ```python import tensorflow as tf input = tf.constant([1,1],dtype=tf.qint32) @tf.function def test(): y = tf.raw_ops.Dequantize( input=input, min_range=[1.0], max_range=[10.0], mode='MIN_COMBINED', narrow_range=False, axis=2**31-1, dtype=tf.bfloat16) return y test() ``` The `axis` argument can be `-1` (the default value for the optional argument) or any other positive value at most the number of dimensions of the input. Unfortunately, the upper bound is not checked, and, since the code computes `axis + 1`, an attacker can trigger an integer overflow: ```cc int axis = -1; Status s = c->GetAttr("axis", &axis); // ... if (axis < -1) { return errors::InvalidArgument("axis should be at least -1, got ", axis); } // ... if (axis != -1) { ShapeHandle input; TF_RETURN_IF_ERROR(c->WithRankAtLeast(c->input(0), axis + 1, &input)); // ... } ``` ### Patches We have patched the issue in GitHub commit [b64638ec5ccaa77b7c1eb90958e3d85ce381f91b](https://github.com/tensorflow/tensorflow/commit/b64638ec5ccaa77b7c1eb90958e3d85ce381f91b). The fix will be included in TensorFlow 2.8.0. We will also cherrypick this commit on TensorFlow 2.7.1, TensorFlow 2.6.3, and TensorFlow 2.5.3, as these are also affected and still in supported range. ### 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 by Yu Tian of Qihoo 360 AIVul Team.
Credit: security-advisories@github.com security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| pip/tensorflow-gpu | =2.7.0 | 2.7.1 |
| pip/tensorflow-gpu | >=2.6.0<2.6.3 | 2.6.3 |
| pip/tensorflow-gpu | <2.5.3 | 2.5.3 |
| pip/tensorflow-cpu | =2.7.0 | 2.7.1 |
| pip/tensorflow-cpu | >=2.6.0<2.6.3 | 2.6.3 |
| pip/tensorflow-cpu | <2.5.3 | 2.5.3 |
| pip/tensorflow | =2.7.0 | 2.7.1 |
| pip/tensorflow | >=2.6.0<2.6.3 | 2.6.3 |
| pip/tensorflow | <2.5.3 | 2.5.3 |
| TensorFlow Keras | <=2.5.2 | |
| TensorFlow Keras | >=2.6.0<=2.6.2 | |
| TensorFlow Keras | =2.7.0 |
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Reference Links
- https://github.com/tensorflow/tensorflow/blob/5100e359aef5c8021f2e71c7b986420b85ce7b3d/tensorflow/core/ops/array_ops.cc#L3001-L3034
- https://github.com/tensorflow/tensorflow/commit/b64638ec5ccaa77b7c1eb90958e3d85ce381f91b
- https://github.com/tensorflow/tensorflow/security/advisories/GHSA-c6fh-56w7-fvjw
- https://nvd.nist.gov/vuln/detail/CVE-2022-21727
- https://github.com/pypa/advisory-database/tree/main/vulns/tensorflow-cpu/PYSEC-2022-51.yaml
- https://github.com/pypa/advisory-database/tree/main/vulns/tensorflow-gpu/PYSEC-2022-106.yaml
- https://github.com/advisories/GHSA-c6fh-56w7-fvjw (Advisory)
Frequently Asked Questions
What is the severity of CVE-2022-21727?
CVE-2022-21727 is classified as a high-severity vulnerability due to its potential for causing significant security issues through integer overflow.
How do I fix CVE-2022-21727?
To mitigate CVE-2022-21727, you should update to TensorFlow version 2.7.1 or later.
Which TensorFlow versions are affected by CVE-2022-21727?
CVE-2022-21727 affects TensorFlow versions 2.5.2 and earlier, including the 2.6.x series up to 2.6.2.
What types of attacks can exploit CVE-2022-21727?
CVE-2022-21727 can be exploited through crafted inputs that trigger the integer overflow, potentially leading to arbitrary code execution.
Is CVE-2022-21727 relevant to both GPU and CPU versions of TensorFlow?
Yes, CVE-2022-21727 impacts both TensorFlow GPU and CPU versions equally.
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