PT-2021-18269 · Google · Tensorflow

Mihaimaruseac · Published 2021-05-14 · Updated 2024-03-06 · CVE-2021-29518

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

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

Name of the Vulnerable Software and Affected Versions: TensorFlow versions prior to 2.5.0 TensorFlow versions 2.4.2 and earlier TensorFlow versions 2.3.3 and earlier TensorFlow versions 2.2.3 and earlier TensorFlow versions 2.1.4 and earlier

Description: The issue arises in eager mode, where session operations are invalid, but users can still call raw ops associated with them, triggering a null pointer dereference. The implementation dereferences the session state pointer without checking its validity, leading to undefined behavior when ctx->session state() is nullptr.

Recommendations: For versions prior to 2.5.0, update to TensorFlow 2.5.0 or later. For versions 2.4.2 and earlier, update to TensorFlow 2.4.2 or later. For versions 2.3.3 and earlier, update to TensorFlow 2.3.3 or later. For versions 2.2.3 and earlier, update to TensorFlow 2.2.3 or later. For versions 2.1.4 and earlier, update to TensorFlow 2.1.4 or later. As a temporary workaround, consider avoiding the use of tf.raw ops.GetSessionTensor and tf.raw ops.DeleteSessionTensor in eager mode until the issue is resolved.

Exploit

Fix

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

BIT-TENSORFLOW-2021-29518

CVE-2021-29518

GHSA-62GX-355R-9FHG

PYSEC-2021-155

PYSEC-2021-446

PYSEC-2021-644

Affected Products

Tensorflow

References · 12

• 🔥 https://github.com/tensorflow/tensorflow/security/advisories/GHSA-62gx-355r-9fhg · Exploit
• https://github.com/tensorflow/tensorflow/commit/ff70c47a396ef1e3cb73c90513da4f5cb71bebba · Patch
• https://osv.dev/vulnerability/PYSEC-2021-155 · Vendor Advisory
• https://osv.dev/vulnerability/BIT-tensorflow-2021-29518 · Vendor Advisory
• https://osv.dev/vulnerability/PYSEC-2021-446 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-62gx-355r-9fhg · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-29518 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-29518 · Security Note
• https://osv.dev/vulnerability/PYSEC-2021-644 · Vendor Advisory
• https://github.com/pypa/advisory-database/tree/main/vulns/tensorflow-gpu/PYSEC-2021-644.yaml · Note
• https://github.com/pypa/advisory-database/tree/main/vulns/tensorflow/PYSEC-2021-155.yaml · Note
• https://github.com/pypa/advisory-database/tree/main/vulns/tensorflow-cpu/PYSEC-2021-446.yaml · Note