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CVE-2021-37681— Null pointer exception in TensorFlow Lite

Quick assessment

Affected
tensorflow tensorflow
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Google TensorFlow是美国谷歌（Google）公司的一套用于机器学习的端到端开源平台。 Google TensorFlow 存在代码问题漏洞，该漏洞源于在受影响的版本中，在TFLite中SVDF的实现是容易受到空指针错误攻击的。

CVSS 7.8 · High EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation
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I. Basic Information for CVE-2021-37681

Vulnerability Information
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Vulnerability Title
Null pointer exception in TensorFlow Lite
Source: CVE Program / CVE List V5
Vulnerability Description
TensorFlow is an end-to-end open source platform for machine learning. In affected versions the implementation of SVDF in TFLite is [vulnerable to a null pointer error](https://github.com/tensorflow/tensorflow/blob/460e000de3a83278fb00b61a16d161b1964f15f4/tensorflow/lite/kernels/svdf.cc#L300-L313). The [`GetVariableInput` function](https://github.com/tensorflow/tensorflow/blob/460e000de3a83278fb00b61a16d161b1964f15f4/tensorflow/lite/kernels/kernel_util.cc#L115-L119) can return a null pointer but `GetTensorData` assumes that the argument is always a valid tensor. Furthermore, because `GetVariableInput` calls [`GetMutableInput`](https://github.com/tensorflow/tensorflow/blob/460e000de3a83278fb00b61a16d161b1964f15f4/tensorflow/lite/kernels/kernel_util.cc#L82-L90) which might return `nullptr`, the `tensor->is_variable` expression can also trigger a null pointer exception. We have patched the issue in GitHub commit 5b048e87e4e55990dae6b547add4dae59f4e1c76. 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5
Vulnerability Title
Google TensorFlow 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Google TensorFlow是美国谷歌（Google）公司的一套用于机器学习的端到端开源平台。 Google TensorFlow 存在代码问题漏洞，该漏洞源于在受影响的版本中，在TFLite中SVDF的实现是容易受到空指针错误攻击的。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
tensorflow tensorflow >= 2.5.0, < 2.5.1 -

II. Public POCs for CVE-2021-37681

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III. Intelligence Information for CVE-2021-37681

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Patches & Fixes for CVE-2021-37681 (1)

Vendor Advisories for CVE-2021-37681 (1)

Same Patch Batch · tensorflow · 2021-08-12 · 58 CVEs total

CVE-2021-37678 9.3 CRITICAL Arbitrary code execution due to YAML deserialization
CVE-2021-37639 8.4 HIGH Null pointer dereference and heap OOB read in TensorFlow
CVE-2021-37689 7.8 HIGH Null pointer dereference in TensorFlow Lite MLIR optimizations
CVE-2021-37665 7.8 HIGH Incomplete validation in MKL requantization in TensorFlow
CVE-2021-37663 7.8 HIGH Incomplete validation in `QuantizeV2` in TensorFlow
CVE-2021-37648 7.8 HIGH Incorrect validation of `SaveV2` inputs in TensorFlow
CVE-2021-37688 7.8 HIGH Null pointer dereference in TensorFlow Lite
CVE-2021-37676 7.8 HIGH Reference binding to nullptr in shape inference in TensorFlow
CVE-2021-37671 7.8 HIGH Reference binding to nullptr in map operations in TensorFlow
CVE-2021-37666 7.8 HIGH Reference binding to nullptr in `RaggedTensorToVariant` in TensorFlow
CVE-2021-37667 7.8 HIGH Reference binding to nullptr in unicode encoding in TensorFlow
CVE-2021-37652 7.8 HIGH Use after free in boosted trees creation in TensorFlow
CVE-2021-37650 7.8 HIGH Segfault and heap buffer overflow in `{Experimental,}DatasetToTFRecord` in TensorFlow
CVE-2021-37643 7.7 HIGH Null pointer dereference in `MatrixDiagPartOp` in TensorFlow
CVE-2021-37647 7.7 HIGH Null pointer dereference in `SparseTensorSliceDataset` in TensorFlow
CVE-2021-37638 7.7 HIGH Null pointer dereference in `RaggedTensorToTensor` in TensorFlow
CVE-2021-37649 7.7 HIGH Null pointer dereference in `UncompressElement` in TensorFlow
CVE-2021-37637 7.7 HIGH Null pointer dereference in `CompressElement` in TensorFlow
CVE-2021-37659 7.3 HIGH Out of bounds read via null pointer dereference in TensorFlow
CVE-2021-37664 7.3 HIGH Heap OOB in boosted trees in TensorFlow

Showing top 20 of 58 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: tensorflow
Same vendor: tensorflow
Same weakness: CWE-476

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