CVE-2021-37692 Information

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.

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Reference

https://github.com/tensorflow/tensorflow/pull/50508 https://github.com/tensorflow/tensorflow/security/advisories/GHSA-cmgw-8vpc-rc59 https://github.com/tensorflow/tensorflow/commit/8721ba96e5760c229217b594f6d2ba332beedf22

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

5.5