Heap disclosure via unchecked RaggedTensor inner shapes
Published Aug 12, 2021 · Updated Aug 4, 2024
Out-of-bounds reads in Google TensorFlow before 2.3.4, 2.4.0 through 2.4.2, and 2.5.0 allow local users to disclose heap data. The Variant-to-RaggedTensor conversion fails to verify that all inner tensor shapes match, so nested tf.map_fn fills an incorrectly shaped output with uninitialized heap contents. Execution requires local low-privileged code to supply a RaggedTensor to nested tf.map_fn without a function signature; crafted shapes disclose heap data or truncate output data.
Summary
What happened
Out-of-bounds reads in Google TensorFlow before 2.3.4, 2.4.0 through 2.4.2, and 2.5.0 allow local users to disclose heap data. The Variant-to-RaggedTensor conversion fails to verify that all inner tensor shapes match, so nested tf.map_fn fills an incorrectly shaped output with uninitialized heap contents. Execution requires local low-privileged code to supply a RaggedTensor to nested tf.map_fn without a function signature; crafted shapes disclose heap data or truncate output data.
The record
- CVE
- CVE-2021-37679
- Published
- Aug 12, 2021
- Updated
- Aug 4, 2024
- Vendor
- Product
- TensorFlow
- Classifications
- CWE-681, CWE-125
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 12, 2021CVE publishedPublication date reported by the CVE source.
- Aug 4, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 2.3.4
- Affected versionversion=>= 2.4.0, < 2.4.3
- Affected versionversion=>= 2.5.0, < 2.5.1
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Nested tf.map_fn RaggedTensor reproducerproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo