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AVID-2026-R0771
Description
Heap OOB access in Dilation2DBackpropInput (CVE-2021-29566)
Details
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.
Reason for inclusion in AVID: CVE-2021-29566 describes a heap out-of-bounds write in TensorFlow’s Dilation2DBackpropInput, a memory-safety vulnerability in a widely used ML framework. TensorFlow is an AI software library, and this affects artifacts used in building, training, and serving AI systems. This is a software vulnerability in a component used in general-purpose AI stacks, with explicit CVE reference and remediation. Therefore it is AI-related, part of the GP AI supply chain, constitutes a security/safety vulnerability, and there is sufficient evidence in the report.
References
- NVD entry
- https://github.com/tensorflow/tensorflow/security/advisories/GHSA-pvrc-hg3f-58r6
- https://github.com/tensorflow/tensorflow/commit/3f6fe4dfef6f57e768260b48166c27d148f3015f
Affected or Relevant Artifacts
- Developer: tensorflow
- Deployer: tensorflow
- Artifact Details:
| Type | Name |
|---|---|
| System | tensorflow |
Impact
AVID Taxonomy Categorization
- Risk domains: Security
- SEP subcategories: S0100: Software Vulnerability
- Lifecycle stages: L06: Deployment
CVSS
| Version | 3.1 |
| Vector String | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L |
| Base Score | 2.5 |
| Base Severity | 🟢 Low |
| Attack Vector | LOCAL |
| Attack Complexity | 🔴 High |
| Privileges Required | 🟢 Low |
| User Interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality Impact | NONE |
| Integrity Impact | NONE |
| Availability Impact | 🟢 Low |
CWE
| ID | Description |
|---|---|
| CWE-787 | CWE-787: Out-of-bounds Write |
Other information
- Report Type: Advisory
- Credits:
- Date Reported: 2021-05-14
- Version: 0.3.3
- AVID Entry