// For flags

CVE-2021-37648

Incorrect validation of `SaveV2` inputs in TensorFlow

Severity Score

7.8
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

TensorFlow is an end-to-end open source platform for machine learning. In affected versions the code for `tf.raw_ops.SaveV2` does not properly validate the inputs and an attacker can trigger a null pointer dereference. The [implementation](https://github.com/tensorflow/tensorflow/blob/8d72537c6abf5a44103b57b9c2e22c14f5f49698/tensorflow/core/kernels/save_restore_v2_ops.cc) uses `ValidateInputs` to check that the input arguments are valid. This validation would have caught the illegal state represented by the reproducer above. However, the validation uses `OP_REQUIRES` which translates to setting the `Status` object of the current `OpKernelContext` to an error status, followed by an empty `return` statement which just terminates the execution of the function it is present in. However, this does not mean that the kernel execution is finalized: instead, execution continues from the next line in `Compute` that follows the call to `ValidateInputs`. This is equivalent to lacking the validation. We have patched the issue in GitHub commit 9728c60e136912a12d99ca56e106b7cce7af5986. The fix will be included in TensorFlow 2.6.0. We will also cherrypick this commit on TensorFlow 2.5.1, TensorFlow 2.4.3, and TensorFlow 2.3.4, as these are also affected and still in supported range.

TensorFlow es una plataforma de código abierto de extremo a extremo para el aprendizaje automático. En las versiones afectadas el código para "tf.raw_ops.SaveV2" no comprueba correctamente las entradas y un atacante puede desencadenar una desreferencia de puntero null. La [implementación](https://github.com/tensorflow/tensorflow/blob/8d72537c6abf5a44103b57b9c2e22c14f5f49698/tensorflow/core/kernels/save_restore_v2_ops.cc) usa "ValidateInputs" para comprobar que los argumentos de entrada son válidos. Esta comprobación habría comprendido el estado ilegal representado por el reproductor anterior. Sin embargo, la comprobación usa "OP_REQUIRES" que se traduce en establecer el objeto "Status" del actual "OpKernelContext" a un estado de error, seguido de una sentencia "return" vacía que simplemente termina la ejecución de la función en la que está presente. Sin embargo, esto no significa que la ejecución del kernel haya finalizado: en su lugar, la ejecución continúa a partir de la siguiente línea en "Compute" que sigue a la llamada a "ValidateInputs". Esto equivale a que la comprobación no se lleve a cabo. Hemos parcheado el problema en el commit 9728c60e136912a12d99ca56e106b7cce7af5986 de GitHub. La corrección será incluida en TensorFlow versión 2.6.0. También seleccionaremos este commit en TensorFlow versión 2.5.1, TensorFlow versión 2.4.3 y TensorFlow versión 2.3.4, ya que estos también están afectados y todavía están en el rango de soporte.

*Credits: N/A
CVSS Scores
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Attack Vector
Local
Attack Complexity
Low
Authentication
None
Confidentiality
Partial
Integrity
Partial
Availability
Partial
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2021-07-29 CVE Reserved
  • 2021-08-12 CVE Published
  • 2023-03-08 EPSS Updated
  • 2024-08-04 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-476: NULL Pointer Dereference
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Google
Search vendor "Google"
Tensorflow
Search vendor "Google" for product "Tensorflow"
>= 2.3.0 < 2.3.4
Search vendor "Google" for product "Tensorflow" and version " >= 2.3.0 < 2.3.4"
-
Affected
Google
Search vendor "Google"
Tensorflow
Search vendor "Google" for product "Tensorflow"
>= 2.4.0 < 2.4.3
Search vendor "Google" for product "Tensorflow" and version " >= 2.4.0 < 2.4.3"
-
Affected
Google
Search vendor "Google"
Tensorflow
Search vendor "Google" for product "Tensorflow"
2.5.0
Search vendor "Google" for product "Tensorflow" and version "2.5.0"
-
Affected
Google
Search vendor "Google"
Tensorflow
Search vendor "Google" for product "Tensorflow"
2.6.0
Search vendor "Google" for product "Tensorflow" and version "2.6.0"
rc0
Affected
Google
Search vendor "Google"
Tensorflow
Search vendor "Google" for product "Tensorflow"
2.6.0
Search vendor "Google" for product "Tensorflow" and version "2.6.0"
rc1
Affected
Google
Search vendor "Google"
Tensorflow
Search vendor "Google" for product "Tensorflow"
2.6.0
Search vendor "Google" for product "Tensorflow" and version "2.6.0"
rc2
Affected