CVE-2021-29512
Heap buffer overflow in `RaggedBinCount`
Description
TensorFlow is an end-to-end open source platform for machine learning. If the `splits` argument of `RaggedBincount` does not specify a valid `SparseTensor`(https://www.tensorflow.org/api_docs/python/tf/sparse/SparseTensor), then an attacker can trigger a heap buffer overflow. This will cause a read from outside the bounds of the `splits` tensor buffer in the implementation of the `RaggedBincount` op(https://github.com/tensorflow/tensorflow/blob/8b677d79167799f71c42fd3fa074476e0295413a/tensorflow/core/kernels/bincount_op.cc#L430-L433). Before the `for` loop, `batch_idx` is set to 0. The user controls the `splits` array, making it contain only one element, 0. Thus, the code in the `while` loop would increment `batch_idx` and then try to read `splits(1)`, which is outside of bounds. The fix will be included in TensorFlow 2.5.0. We will also cherrypick this commit on TensorFlow 2.4.2 and TensorFlow 2.3.3, as these are also affected.
How to fix CVE-2021-29512
To remediate CVE-2021-29512, upgrade the affected package to a fixed version below.
- —upgrade to 2.3.3 or later
- —upgrade to 2.3.3 or later
- —upgrade to eebb96c2830d48597d055d247c0e9aebaea94cd5 or later
- —upgrade to eebb96c2830d48597d055d247c0e9aebaea94cd5 or later
- —upgrade to 2.3.3 or later
- —upgrade to eebb96c2830d48597d055d247c0e9aebaea94cd5 or later
- —upgrade to 2.3.3 or later
Is CVE-2021-29512 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (7)
- >= 2.3.0, < 2.3.3, >= 2.4.0, < 2.4.2
- >= 2.3.0, < 2.3.3
- from 0, < eebb96c2830d48597d055d247c0e9aebaea94cd5 | >= 2.3.0, < 2.3.3, >= 2.4.0, < 2.4.2
- from 0, < eebb96c2830d48597d055d247c0e9aebaea94cd5 | >= 2.3.0, < 2.3.3, >= 2.4.0, < 2.4.2
- >= 2.3.0, < 2.3.3
- from 0, < eebb96c2830d48597d055d247c0e9aebaea94cd5 | >= 2.3.0, < 2.3.3, >= 2.4.0, < 2.4.2
- >= 2.3.0, < 2.3.3
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N |
| osv | CVSS 3.1 | LOW2.5 | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L |
References (6)
- ADVISORYnvd.nist.gov/vuln/detail/CVE-2021-29512
- WEBgithub.com/pypa/advisory-database/tree/main/vulns/tensorflow-cpu/PYSEC-2021-440.yaml
- WEBgithub.com/pypa/advisory-database/tree/main/vulns/tensorflow-gpu/PYSEC-2021-638.yaml
- WEBgithub.com/pypa/advisory-database/tree/main/vulns/tensorflow/PYSEC-2021-149.yaml