Vulnerability Details : CVE-2021-29566

TensorFlow is an end-to-end open source platform for machine learning. An attacker can write outside the bounds of heap allocated arrays by passing invalid arguments to `tf.raw_ops.Dilation2DBackpropInput`. This is because the implementation(https://github.com/tensorflow/tensorflow/blob/afd954e65f15aea4d438d0a219136fc4a63a573d/tensorflow/core/kernels/dilation_ops.cc#L321-L322) does not validate before writing to the output array. The values for `h_out` and `w_out` are guaranteed to be in range for `out_backprop` (as they are loop indices bounded by the size of the array). However, there are no similar guarantees relating `h_in_max`/`w_in_max` and `in_backprop`. The fix will be included in TensorFlow 2.5.0. We will also cherrypick this commit on TensorFlow 2.4.2, TensorFlow 2.3.3, TensorFlow 2.2.3 and TensorFlow 2.1.4, as these are also affected and still in supported range.

Vulnerability category: Memory Corruption

Published 2021-05-14 20:15:14

Updated 2021-07-26 16:20:37

Source GitHub, Inc.

View at NVD, CVE.org

Exploit prediction scoring system (EPSS) score for CVE-2021-29566

Probability of exploitation activity in the next 30 days: 0.05%

Percentile, the proportion of vulnerabilities that are scored at or less: ~ 15 % EPSS Score History EPSS FAQ

CVSS scores for CVE-2021-29566

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Source
4.6	MEDIUM	AV:L/AC:L/Au:N/C:P/I:P/A:P	3.9	6.4	nvd@nist.gov
Access Vector: Local Access Complexity: Low Authentication: None Confidentiality Impact: Partial Integrity Impact: Partial Availability Impact: Partial
7.8	HIGH	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	1.8	5.9	nvd@nist.gov
Attack Vector: Local Attack Complexity: Low Privileges Required: Low User Interaction: None Scope: Unchanged Confidentiality: High Integrity: High Availability: High
2.5	LOW	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L	1.0	1.4	security-advisories@github.com
Attack Vector: Local Attack Complexity: High Privileges Required: Low User Interaction: None Scope: Unchanged Confidentiality: None Integrity: None Availability: Low

CWE ids for CVE-2021-29566

CWE-787 Out-of-bounds Write

The product writes data past the end, or before the beginning, of the intended buffer.

Assigned by: security-advisories@github.com (Primary)

References for CVE-2021-29566

https://github.com/tensorflow/tensorflow/security/advisories/GHSA-pvrc-hg3f-58r6

Heap OOB access in `Dilation2DBackpropInput` · Advisory · tensorflow/tensorflow · GitHub
Exploit;Patch;Third Party Advisory
https://github.com/tensorflow/tensorflow/commit/3f6fe4dfef6f57e768260b48166c27d148f3015f

Add missing validations in dillation ops. · tensorflow/tensorflow@3f6fe4d · GitHub
Patch;Third Party Advisory

Products affected by CVE-2021-29566

Google » Tensorflow
Versions from including (>=) 2.3.0 and before (<) 2.3.3
cpe:2.3:a:google:tensorflow:*:*:*:*:*:*:*:*
Matching versions
Google » Tensorflow
Versions before (<) 2.1.4
cpe:2.3:a:google:tensorflow:*:*:*:*:*:*:*:*
Matching versions
Google » Tensorflow
Versions from including (>=) 2.2.0 and before (<) 2.2.3
cpe:2.3:a:google:tensorflow:*:*:*:*:*:*:*:*
Matching versions
Google » Tensorflow
Versions from including (>=) 2.4.0 and before (<) 2.4.2
cpe:2.3:a:google:tensorflow:*:*:*:*:*:*:*:*
Matching versions