ghsa-r8r4-4w47-4w9x
Vulnerability from github
Published
2024-04-10 21:30
Modified
2024-04-10 21:30
Details

In the Linux kernel, the following vulnerability has been resolved:

NFSD: Fix exposure in nfsd4_decode_bitmap()

rtm@csail.mit.edu reports:

nfsd4_decode_bitmap4() will write beyond bmval[bmlen-1] if the RPC directs it to do so. This can cause nfsd4_decode_state_protect4_a() to write client-supplied data beyond the end of nfsd4_exchange_id.spo_must_allow[] when called by nfsd4_decode_exchange_id().

Rewrite the loops so nfsd4_decode_bitmap() cannot iterate beyond @bmlen.

Reported by: rtm@csail.mit.edu

Show details on source website

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{
  "affected": [],
  "aliases": [
    "CVE-2021-47213"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-04-10T19:15:48Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFSD: Fix exposure in nfsd4_decode_bitmap()\n\nrtm@csail.mit.edu reports:\n\u003e nfsd4_decode_bitmap4() will write beyond bmval[bmlen-1] if the RPC\n\u003e directs it to do so. This can cause nfsd4_decode_state_protect4_a()\n\u003e to write client-supplied data beyond the end of\n\u003e nfsd4_exchange_id.spo_must_allow[] when called by\n\u003e nfsd4_decode_exchange_id().\n\nRewrite the loops so nfsd4_decode_bitmap() cannot iterate beyond\n@bmlen.\n\nReported by: rtm@csail.mit.edu",
  "id": "GHSA-r8r4-4w47-4w9x",
  "modified": "2024-04-10T21:30:32Z",
  "published": "2024-04-10T21:30:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47213"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/10c22d9519f3f5939de61a1500aa3a926b778d3a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c0019b7db1d7ac62c711cda6b357a659d46428fe"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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