CVE-2021-29544

Description

TensorFlow is an end-to-end open source platform for machine learning. An attacker can trigger a denial of service via a `CHECK`-fail in `tf.raw_ops.QuantizeAndDequantizeV4Grad`. This is because the implementation does not validate the rank of the `input_*` tensors. In turn, this results in the tensors being passes as they are to `QuantizeAndDequantizePerChannelGradientImpl`. However, the `vec<T>` method, requires the rank to 1 and triggers a `CHECK` failure otherwise. The fix will be included in TensorFlow 2.5.0. We will also cherrypick this commit on TensorFlow 2.4.2 as this is the only other affected version.

How to fix CVE-2021-29544

To remediate CVE-2021-29544, upgrade the affected package to a fixed version below.

• —upgrade to 2.4.2 or later
• —upgrade to 2.4.2 or later
• —upgrade to 20431e9044cf2ad3c0323c34888b192f3289af6b or later
• —upgrade to 20431e9044cf2ad3c0323c34888b192f3289af6b or later
• —upgrade to 2.4.2 or later
• —upgrade to 20431e9044cf2ad3c0323c34888b192f3289af6b or later
• —upgrade to 2.4.2 or later

Is CVE-2021-29544 being exploited?

Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.

Affected packages (7)

• >= 2.4.0, < 2.4.2
• >= 2.4.0, < 2.4.2
• from 0, < 20431e9044cf2ad3c0323c34888b192f3289af6b | from 0, < 2.2.0rc0, >= 2.2.0, < 2.3.0rc0, >= 2.3.0, < 2.3.4, >= 2.4.0, < 2.4.3
• from 0, < 20431e9044cf2ad3c0323c34888b192f3289af6b | from 0, < 2.2.0rc0, >= 2.2.0, < 2.3.0rc0, >= 2.3.0, < 2.3.4, >= 2.4.0, < 2.4.3
• >= 2.4.0, < 2.4.2
• from 0, < 20431e9044cf2ad3c0323c34888b192f3289af6b | from 0, < 2.2.0rc0, >= 2.2.0, < 2.3.0rc0, >= 2.3.0, < 2.3.4, >= 2.4.0, < 2.4.3
• >= 2.4.0, < 2.4.2

CVSS scores

References (9)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2021-29544
• PATCHgithub.com/tensorflow/tensorflow
• WEBgithub.com/pypa/advisory-database/tree/main/vulns/tensorflow-cpu/PYSEC-2021-472.yaml
• WEBgithub.com/pypa/advisory-database/tree/main/vulns/tensorflow-gpu/PYSEC-2021-670.yaml