2021-37667 | Google TensorFlow tf.raw_ops.UnicodeEncode uninitialized pointer


CVSS Meta Temp Score

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Current Exploit Price (≈)

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CTI Interest Score

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6.0 $5k-$25k 0.07

A vulnerability was found in Google TensorFlow up to 2.3.3/2.4.2/2.5.0 (Artificial Intelligence Software) and classified as critical. Using CWE to declare the problem leads to CWE-824. Impacted is confidentiality, integrity, and availability. CVE summarizes:

TensorFlow is an end-to-end open source platform for machine learning. In affected versions an attacker can cause undefined behavior via binding a reference to null pointer in `tf.raw_ops.UnicodeEncode`. The [implementation](https://github.com/tensorflow/tensorflow/blob/460e000de3a83278fb00b61a16d161b1964f15f4/tensorflow/core/kernels/unicode_ops.cc#L533-L539) reads the first dimension of the `input_splits` tensor before validating that this tensor is not empty. We have patched the issue in GitHub commit 2e0ee46f1a47675152d3d865797a18358881d7a6. 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.

The weakness was published 08/13/2021. The advisory is available at github.com. This vulnerability is handled as CVE-2021-37667 since 07/29/2021. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $5k-$25k at the moment (estimation calculated on 08/17/2021).

Upgrading to version 2.3.4, 2.4.3, 2.5.1 or 2.6.0 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

Type

Vendor

Name

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.0

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍
Class: Unknown
CWE: CWE-824
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

Price Prediction: 🔍
Current Price Estimation: 🔒


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Threat Intelligenceinfoedit

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: TensorFlow 2.3.4/2.4.3/2.5.1/2.6.0
Patch: github.com

07/29/2021 CVE assigned
08/13/2021 +15 days Advisory disclosed
08/13/2021 +0 days VulDB entry created
08/17/2021 +4 days VulDB last updateVendor: https://www.google.com/

Advisory: github.com
Status: Confirmed
Confirmation: 🔒

CVE: CVE-2021-37667 (🔒)

Created: 08/13/2021 07:24
Updated: 08/17/2021 19:47
Changes: (1) source_cve_cna
Complete: 🔍

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