cve-2024-50217
Vulnerability from cvelistv5
Published
2024-11-09 10:14
Modified
2024-12-19 09:35
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: btrfs: fix use-after-free of block device file in __btrfs_free_extra_devids() Mounting btrfs from two images (which have the same one fsid and two different dev_uuids) in certain executing order may trigger an UAF for variable 'device->bdev_file' in __btrfs_free_extra_devids(). And following are the details: 1. Attach image_1 to loop0, attach image_2 to loop1, and scan btrfs devices by ioctl(BTRFS_IOC_SCAN_DEV): / btrfs_device_1 → loop0 fs_device \ btrfs_device_2 → loop1 2. mount /dev/loop0 /mnt btrfs_open_devices btrfs_device_1->bdev_file = btrfs_get_bdev_and_sb(loop0) btrfs_device_2->bdev_file = btrfs_get_bdev_and_sb(loop1) btrfs_fill_super open_ctree fail: btrfs_close_devices // -ENOMEM btrfs_close_bdev(btrfs_device_1) fput(btrfs_device_1->bdev_file) // btrfs_device_1->bdev_file is freed btrfs_close_bdev(btrfs_device_2) fput(btrfs_device_2->bdev_file) 3. mount /dev/loop1 /mnt btrfs_open_devices btrfs_get_bdev_and_sb(&bdev_file) // EIO, btrfs_device_1->bdev_file is not assigned, // which points to a freed memory area btrfs_device_2->bdev_file = btrfs_get_bdev_and_sb(loop1) btrfs_fill_super open_ctree btrfs_free_extra_devids if (btrfs_device_1->bdev_file) fput(btrfs_device_1->bdev_file) // UAF ! Fix it by setting 'device->bdev_file' as 'NULL' after closing the btrfs_device in btrfs_close_one_device().
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/47a83f8df39545f3f552bb6a1b6d9c30e37621ddPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/aec8e6bf839101784f3ef037dcdb9432c3f32343Patch
Impacted products
Vendor Product Version
Linux Linux Version: 142388194191a3edc9ba01cfcfd8b691e0971fb2
Version: 142388194191a3edc9ba01cfcfd8b691e0971fb2
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   Linux Linux Version: 4.8
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix use-after-free of block device file in __btrfs_free_extra_devids()\n\nMounting btrfs from two images (which have the same one fsid and two\ndifferent dev_uuids) in certain executing order may trigger an UAF for\nvariable \u0027device-\u003ebdev_file\u0027 in __btrfs_free_extra_devids(). And\nfollowing are the details:\n\n1. Attach image_1 to loop0, attach image_2 to loop1, and scan btrfs\n   devices by ioctl(BTRFS_IOC_SCAN_DEV):\n\n             /  btrfs_device_1 \u2192 loop0\n   fs_device\n             \\  btrfs_device_2 \u2192 loop1\n2. mount /dev/loop0 /mnt\n   btrfs_open_devices\n    btrfs_device_1-\u003ebdev_file = btrfs_get_bdev_and_sb(loop0)\n    btrfs_device_2-\u003ebdev_file = btrfs_get_bdev_and_sb(loop1)\n   btrfs_fill_super\n    open_ctree\n     fail: btrfs_close_devices // -ENOMEM\n\t    btrfs_close_bdev(btrfs_device_1)\n             fput(btrfs_device_1-\u003ebdev_file)\n\t      // btrfs_device_1-\u003ebdev_file is freed\n\t    btrfs_close_bdev(btrfs_device_2)\n             fput(btrfs_device_2-\u003ebdev_file)\n\n3. mount /dev/loop1 /mnt\n   btrfs_open_devices\n    btrfs_get_bdev_and_sb(\u0026bdev_file)\n     // EIO, btrfs_device_1-\u003ebdev_file is not assigned,\n     // which points to a freed memory area\n    btrfs_device_2-\u003ebdev_file = btrfs_get_bdev_and_sb(loop1)\n   btrfs_fill_super\n    open_ctree\n     btrfs_free_extra_devids\n      if (btrfs_device_1-\u003ebdev_file)\n       fput(btrfs_device_1-\u003ebdev_file) // UAF !\n\nFix it by setting \u0027device-\u003ebdev_file\u0027 as \u0027NULL\u0027 after closing the\nbtrfs_device in btrfs_close_one_device()."
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      "title": "btrfs: fix use-after-free of block device file in __btrfs_free_extra_devids()",
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    "dateReserved": "2024-10-21T19:36:19.972Z",
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    "state": "PUBLISHED"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2024-50217\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-11-09T11:15:07.103\",\"lastModified\":\"2024-12-11T15:15:13.550\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbtrfs: fix use-after-free of block device file in __btrfs_free_extra_devids()\\n\\nMounting btrfs from two images (which have the same one fsid and two\\ndifferent dev_uuids) in certain executing order may trigger an UAF for\\nvariable \u0027device-\u003ebdev_file\u0027 in __btrfs_free_extra_devids(). And\\nfollowing are the details:\\n\\n1. Attach image_1 to loop0, attach image_2 to loop1, and scan btrfs\\n   devices by ioctl(BTRFS_IOC_SCAN_DEV):\\n\\n             /  btrfs_device_1 \u2192 loop0\\n   fs_device\\n             \\\\  btrfs_device_2 \u2192 loop1\\n2. mount /dev/loop0 /mnt\\n   btrfs_open_devices\\n    btrfs_device_1-\u003ebdev_file = btrfs_get_bdev_and_sb(loop0)\\n    btrfs_device_2-\u003ebdev_file = btrfs_get_bdev_and_sb(loop1)\\n   btrfs_fill_super\\n    open_ctree\\n     fail: btrfs_close_devices // -ENOMEM\\n\\t    btrfs_close_bdev(btrfs_device_1)\\n             fput(btrfs_device_1-\u003ebdev_file)\\n\\t      // btrfs_device_1-\u003ebdev_file is freed\\n\\t    btrfs_close_bdev(btrfs_device_2)\\n             fput(btrfs_device_2-\u003ebdev_file)\\n\\n3. mount /dev/loop1 /mnt\\n   btrfs_open_devices\\n    btrfs_get_bdev_and_sb(\u0026bdev_file)\\n     // EIO, btrfs_device_1-\u003ebdev_file is not assigned,\\n     // which points to a freed memory area\\n    btrfs_device_2-\u003ebdev_file = btrfs_get_bdev_and_sb(loop1)\\n   btrfs_fill_super\\n    open_ctree\\n     btrfs_free_extra_devids\\n      if (btrfs_device_1-\u003ebdev_file)\\n       fput(btrfs_device_1-\u003ebdev_file) // UAF !\\n\\nFix it by setting \u0027device-\u003ebdev_file\u0027 as \u0027NULL\u0027 after closing the\\nbtrfs_device in btrfs_close_one_device().\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: btrfs: se corrige el use-after-free del archivo del dispositivo de bloque en __btrfs_free_extra_devids(). Montar btrfs desde dos im\u00e1genes (que tienen el mismo fsid y dos dev_uuids diferentes) en cierto orden de ejecuci\u00f3n puede activar un UAF para la variable \u0027device-\u0026gt;bdev_file\u0027 en __btrfs_free_extra_devids(). Y a continuaci\u00f3n se muestran los detalles: 1. Adjunte image_1 a loop0, adjunte image_2 a loop1 y escanee los dispositivos btrfs con ioctl(BTRFS_IOC_SCAN_DEV): / btrfs_device_1 ? loop0 fs_device \\\\ btrfs_device_2 ? loop1 2. monte /dev/loop0 /mnt btrfs_open_devices btrfs_device_1-\u0026gt;bdev_file = btrfs_get_bdev_and_sb(loop0) btrfs_device_2-\u0026gt;bdev_file = btrfs_get_bdev_and_sb(loop1) btrfs_fill_super open_ctree fail: btrfs_close_devices // -ENOMEM btrfs_close_bdev(btrfs_device_1) fput(btrfs_device_1-\u0026gt;bdev_file) // btrfs_device_1-\u0026gt;bdev_file se libera btrfs_close_bdev(btrfs_device_2) fput(btrfs_device_2-\u0026gt;bdev_file) 3. mount /dev/loop1 /mnt btrfs_open_devices btrfs_get_bdev_and_sb(\u0026amp;bdev_file) // EIO, btrfs_device_1-\u0026gt;bdev_file no est\u00e1 asignado, // lo que apunta a un \u00e1rea de memoria liberada btrfs_device_2-\u0026gt;bdev_file = btrfs_get_bdev_and_sb(loop1) btrfs_fill_super open_ctree btrfs_free_extra_devids if (btrfs_device_1-\u0026gt;bdev_file) fput(btrfs_device_1-\u0026gt;bdev_file) // UAF! Arr\u00e9glelo configurando \u0027device-\u0026gt;bdev_file\u0027 como \u0027NULL\u0027 despu\u00e9s de cerrar btrfs_device en btrfs_close_one_device().\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9},{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]},{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.8\",\"versionEndExcluding\":\"6.11.7\",\"matchCriteriaId\":\"92BAD6E0-7814-4F5F-9840-E742D79C4A05\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.12:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"7F361E1D-580F-4A2D-A509-7615F73167A1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.12:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"925478D0-3E3D-4E6F-ACD5-09F28D5DF82C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.12:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"3C95E234-D335-4B6C-96BF-E2CEBD8654ED\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.12:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"E0F717D8-3014-4F84-8086-0124B2111379\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.12:rc5:*:*:*:*:*:*\",\"matchCriteriaId\":\"24DBE6C7-2AAE-4818-AED2-E131F153D2FA\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/47a83f8df39545f3f552bb6a1b6d9c30e37621dd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/aec8e6bf839101784f3ef037dcdb9432c3f32343\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
    "vulnrichment": {
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      "cveMetadata": "{\"cveId\": \"CVE-2024-50217\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-12-19T09:35:38.995Z\", \"dateReserved\": \"2024-10-21T19:36:19.972Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-11-09T10:14:28.798Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
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    }
  }
}


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