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GHSA-9697-98pf-4rw7

MediumCVSS 5.5 / 10
Published Aug 25, 2021·Last modified Mar 13, 2026
Affected Components(0)

No affected components available

Description

Impact

An attacker can read from outside of bounds of heap allocated data by sending specially crafted illegal arguments to tf.raw_ops.UpperBound:

import tensorflow as tf
  
tf.raw_ops.UpperBound(
  sorted_input=[1,2,3],
  values=tf.constant(value=[[0,0,0],[1,1,1],[2,2,2]],dtype=tf.int64),
  out_type=tf.int64)

The implementation does not validate the rank of sorted_input argument:

  void Compute(OpKernelContext* ctx) override {
    const Tensor& sorted_inputs_t = ctx->input(0);
    // ...
    OP_REQUIRES(ctx, sorted_inputs_t.dim_size(0) == values_t.dim_size(0),
                Status(error::INVALID_ARGUMENT,
                       "Leading dim_size of both tensors must match."));
    // ...
    if (output_t->dtype() == DT_INT32) {
      OP_REQUIRES(ctx,
                  FastBoundsCheck(sorted_inputs_t.dim_size(1), ...));
      // ...
    }

As we access the first two dimensions of sorted_inputs_t tensor, it must have rank at least 2.

A similar issue occurs in tf.raw_ops.LowerBound.

Patches

We have patched the issue in GitHub commit 42459e4273c2e47a3232cc16c4f4fff3b3a35c38.

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.

For more information

Please consult our security guide for more information regarding the security model and how to contact us with issues and questions.

Attribution

This vulnerability has been reported by members of the Aivul Team from Qihoo 360.

Risk Scores
Base Score
5.5

The vulnerability requires local access to the device to be exploited. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the confidentiality of the information.

Threat Intelligence
5.1

Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.

EPSS
0.17%

The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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Medium severity
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