CVE-2021-37692

Description

TensorFlow is an end-to-end open source platform for machine learning. In affected versions under certain conditions, Go code can trigger a segfault in string deallocation. For string tensors, `C.TF_TString_Dealloc` is called during garbage collection within a finalizer function. However, tensor structure isn't checked until encoding to avoid a performance penalty. The current method for dealloc assumes that encoding succeeded, but segfaults when a string tensor is garbage collected whose encoding failed (e.g., due to mismatched dimensions). To fix this, the call to set the finalizer function is deferred until `NewTensor` returns and, if encoding failed for a string tensor, deallocs are determined based on bytes written. We have patched the issue in GitHub commit 8721ba96e5760c229217b594f6d2ba332beedf22. The fix will be included in TensorFlow 2.6.0. We will also cherrypick this commit on TensorFlow 2.5.1, which is the other affected version.

How to fix CVE-2021-37692

To remediate CVE-2021-37692, upgrade the affected package to a fixed version below.

• —upgrade to 2.6.0 or later
• —upgrade to 2.5.1 or later
• —upgrade to 8721ba96e5760c229217b594f6d2ba332beedf22 or later
• —upgrade to 8721ba96e5760c229217b594f6d2ba332beedf22 or later
• —upgrade to 2.5.1 or later
• —upgrade to 8721ba96e5760c229217b594f6d2ba332beedf22 or later
• —upgrade to 2.5.1 or later

Is CVE-2021-37692 being exploited?

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

Affected packages (7)

• >= 2.5.0, < 2.6.0
• >= 2.5.0rc0, < 2.5.1
• from 0, < 8721ba96e5760c229217b594f6d2ba332beedf22 | >= 2.3.0, < 2.3.4, >= 2.4.0, < 2.4.3
• from 0, < 8721ba96e5760c229217b594f6d2ba332beedf22 | >= 2.3.0, < 2.3.4, >= 2.4.0, < 2.4.3
• >= 2.5.0rc0, < 2.5.1
• from 0, < 8721ba96e5760c229217b594f6d2ba332beedf22 | >= 2.3.0, < 2.3.4, >= 2.4.0, < 2.4.3
• >= 2.5.0rc0, < 2.5.1

CVSS scores

References (8)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2021-37692
• PATCHgithub.com/tensorflow/tensorflow
• WEBgithub.com/pypa/advisory-database/tree/main/vulns/tensorflow-cpu/PYSEC-2021-605.yaml
• WEBgithub.com/pypa/advisory-database/tree/main/vulns/tensorflow-gpu/PYSEC-2021-803.yaml