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CVE-2021-41201— Unitialized access in `EinsumHelper::ParseEquation`

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 存在缓冲区错误漏洞，该漏洞可能导致未初始化的变量访问。

CVSS 7.8 · High EPSS 0.24% · P15

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter
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I. Basic Information for CVE-2021-41201

Vulnerability Information
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Vulnerability Title
Unitialized access in `EinsumHelper::ParseEquation`
Source: CVE Program / CVE List V5
Vulnerability Description
TensorFlow is an open source platform for machine learning. In affeced versions during execution, `EinsumHelper::ParseEquation()` is supposed to set the flags in `input_has_ellipsis` vector and `*output_has_ellipsis` boolean to indicate whether there is ellipsis in the corresponding inputs and output. However, the code only changes these flags to `true` and never assigns `false`. This results in unitialized variable access if callers assume that `EinsumHelper::ParseEquation()` always sets these flags. The fix will be included in TensorFlow 2.7.0. We will also cherrypick this commit on TensorFlow 2.6.1, TensorFlow 2.5.2, and TensorFlow 2.4.4, 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
使用未经初始化的指针
Source: CVE Program / CVE List V5
Vulnerability Title
Google TensorFlow 缓冲区错误漏洞
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 存在缓冲区错误漏洞，该漏洞可能导致未初始化的变量访问。
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 >= 2.6.0, < 2.6.1 -

II. Public POCs for CVE-2021-41201

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III. Intelligence Information for CVE-2021-41201

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Patches & Fixes for CVE-2021-41201 (1)

Vendor Advisories for CVE-2021-41201 (1)

Same Patch Batch · tensorflow · 2021-11-05 · 34 CVEs total

CVE-2021-41208 8.8 HIGH Incomplete validation in boosted trees code
CVE-2021-41203 7.8 HIGH Missing validation during checkpoint loading
CVE-2021-41220 7.8 HIGH Use after free in `CollectiveReduceV2`
CVE-2021-41221 7.8 HIGH Access to invalid memory during shape inference in `Cudnn*` ops
CVE-2021-41214 7.8 HIGH Reference binding to `nullptr` in `tf.ragged.cross`
CVE-2021-41219 7.8 HIGH Undefined behavior via `nullptr` reference binding in sparse matrix multiplication
CVE-2021-41228 7.5 HIGH Code injection in `saved_model_cli`
CVE-2021-41224 7.1 HIGH `SparseFillEmptyRows` heap OOB read
CVE-2021-41211 7.1 HIGH Heap OOB read in shape inference for `QuantizeV2`
CVE-2021-41205 7.1 HIGH Heap OOB read in all `tf.raw_ops.QuantizeAndDequantizeV*` ops
CVE-2021-41210 7.1 HIGH Heap OOB read in `tf.raw_ops.SparseCountSparseOutput`
CVE-2021-41212 7.1 HIGH Heap OOB read in `tf.ragged.cross`
CVE-2021-41226 7.1 HIGH Heap OOB read in `SparseBinCount`
CVE-2021-41223 7.1 HIGH Heap OOB read in `FusedBatchNorm` kernels
CVE-2021-41206 7.0 HIGH Incomplete validation of shapes in multiple TF ops
CVE-2021-41227 6.6 MEDIUM Arbitrary memory read in `ImmutableConst`
CVE-2021-41200 5.5 MEDIUM Incomplete validation in `tf.summary.create_file_writer`
CVE-2021-41217 5.5 MEDIUM Null pointer exception when `Exit` node is not preceded by `Enter` op
CVE-2021-41197 5.5 MEDIUM Crashes due to overflow and `CHECK`-fail in ops with large tensor shapes
CVE-2021-41198 5.5 MEDIUM Overflow/crash in `tf.tile` when tiling tensor is large

Showing top 20 of 34 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: tensorflow
Same vendor: tensorflow
Same weakness: CWE-824

V. Comments for CVE-2021-41201

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