ghsa-mr66-qfpc-4h9r
Vulnerability from github
In the Linux kernel, the following vulnerability has been resolved:
xfs: don't walk off the end of a directory data block
This adds sanity checks for xfs_dir2_data_unused and xfs_dir2_data_entry to make sure don't stray beyond valid memory region. Before patching, the loop simply checks that the start offset of the dup and dep is within the range. So in a crafted image, if last entry is xfs_dir2_data_unused, we can change dup->length to dup->length-1 and leave 1 byte of space. In the next traversal, this space will be considered as dup or dep. We may encounter an out of bound read when accessing the fixed members.
In the patch, we make sure that the remaining bytes large enough to hold an unused entry before accessing xfs_dir2_data_unused and xfs_dir2_data_unused is XFS_DIR2_DATA_ALIGN byte aligned. We also make sure that the remaining bytes large enough to hold a dirent with a single-byte name before accessing xfs_dir2_data_entry.
{
"affected": [],
"aliases": [
"CVE-2024-41013"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-07-29T07:15:05Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfs: don\u0027t walk off the end of a directory data block\n\nThis adds sanity checks for xfs_dir2_data_unused and xfs_dir2_data_entry\nto make sure don\u0027t stray beyond valid memory region. Before patching, the\nloop simply checks that the start offset of the dup and dep is within the\nrange. So in a crafted image, if last entry is xfs_dir2_data_unused, we\ncan change dup-\u003elength to dup-\u003elength-1 and leave 1 byte of space. In the\nnext traversal, this space will be considered as dup or dep. We may\nencounter an out of bound read when accessing the fixed members.\n\nIn the patch, we make sure that the remaining bytes large enough to hold\nan unused entry before accessing xfs_dir2_data_unused and\nxfs_dir2_data_unused is XFS_DIR2_DATA_ALIGN byte aligned. We also make\nsure that the remaining bytes large enough to hold a dirent with a\nsingle-byte name before accessing xfs_dir2_data_entry.",
"id": "GHSA-mr66-qfpc-4h9r",
"modified": "2024-07-29T09:36:14Z",
"published": "2024-07-29T09:36:13Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-41013"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/0c7fcdb6d06cdf8b19b57c17605215b06afa864a"
}
],
"schema_version": "1.4.0",
"severity": []
}
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- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.