admin/nvd-json-data-feeds
1
0
Fork 0
mirror of https://github.com/fkie-cad/nvd-json-data-feeds.git synced 2025-05-28 17:21:36 +00:00
Code Issues Packages Projects Releases Wiki Activity
nvd-json-data-feeds/CVE-2021/CVE-2021-476xx/CVE-2021-47636.json
cad-safe-bot f0478725b0 Auto-Update: 2025-03-18T21:00:19.783526+00:00
2025-03-18 21:03:50 +00:00

159 lines
8.0 KiB
JSON
Raw Blame History

{
"id": "CVE-2021-47636",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2025-02-26T06:37:05.377",
"lastModified": "2025-03-18T19:29:55.410",
"vulnStatus": "Analyzed",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nubifs: Fix read out-of-bounds in ubifs_wbuf_write_nolock()\n\nFunction ubifs_wbuf_write_nolock() may access buf out of bounds in\nfollowing process:\n\nubifs_wbuf_write_nolock():\n aligned_len = ALIGN(len, 8); // Assume len = 4089, aligned_len = 4096\n if (aligned_len <= wbuf->avail) ... // Not satisfy\n if (wbuf->used) {\n ubifs_leb_write() // Fill some data in avail wbuf\n len -= wbuf->avail; // len is still not 8-bytes aligned\n aligned_len -= wbuf->avail;\n }\n n = aligned_len >> c->max_write_shift;\n if (n) {\n n <<= c->max_write_shift;\n err = ubifs_leb_write(c, wbuf->lnum, buf + written,\n wbuf->offs, n);\n // n > len, read out of bounds less than 8(n-len) bytes\n }\n\n, which can be catched by KASAN:\n =========================================================\n BUG: KASAN: slab-out-of-bounds in ecc_sw_hamming_calculate+0x1dc/0x7d0\n Read of size 4 at addr ffff888105594ff8 by task kworker/u8:4/128\n Workqueue: writeback wb_workfn (flush-ubifs_0_0)\n Call Trace:\n kasan_report.cold+0x81/0x165\n nand_write_page_swecc+0xa9/0x160\n ubifs_leb_write+0xf2/0x1b0 [ubifs]\n ubifs_wbuf_write_nolock+0x421/0x12c0 [ubifs]\n write_head+0xdc/0x1c0 [ubifs]\n ubifs_jnl_write_inode+0x627/0x960 [ubifs]\n wb_workfn+0x8af/0xb80\n\nFunction ubifs_wbuf_write_nolock() accepts that parameter 'len' is not 8\nbytes aligned, the 'len' represents the true length of buf (which is\nallocated in 'ubifs_jnl_xxx', eg. ubifs_jnl_write_inode), so\nubifs_wbuf_write_nolock() must handle the length read from 'buf' carefully\nto write leb safely.\n\nFetch a reproducer in [Link]."
},
{
"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ubifs: Se corrige la lectura fuera de los l\u00edmites en la funci\u00f3n ubifs_wbuf_write_nolock() ubifs_wbuf_write_nolock() puede acceder a buf fuera de los l\u00edmites en el siguiente proceso: ubifs_wbuf_write_nolock(): classified_len = ALIGN(len, 8); // Supongamos que len = 4089, classified_len = 4096 if (aligned_len &lt;= wbuf-&gt;avail) ... // No satisface if (wbuf-&gt;used) { ubifs_leb_write() // Complete algunos datos en avail wbuf len -= wbuf-&gt;avail; // len a\u00fan no est\u00e1 alineado a 8 bytes classified_len -= wbuf-&gt;avail; } n = classified_len &gt;&gt; c-&gt;max_write_shift; if (n) { n &lt;&lt;= c-&gt;max_write_shift; err = ubifs_leb_write(c, wbuf-&gt;lnum, buf + escrito, wbuf-&gt;offs, n); // n &gt; len, lectura fuera de los l\u00edmites menor a 8(n-len) bytes }, lo cual puede ser detectado por KASAN: =========================================================== ERROR: KASAN: slab fuera de los l\u00edmites en ecc_sw_hamming_calculate+0x1dc/0x7d0 Lectura de tama\u00f1o 4 en la direcci\u00f3n ffff888105594ff8 por la tarea kworker/u8:4/128 Cola de trabajo: escritura diferida wb_workfn (flush-ubifs_0_0) Rastreo de llamadas: kasan_report.cold+0x81/0x165 nand_write_page_swecc+0xa9/0x160 ubifs_leb_write+0xf2/0x1b0 [ubifs] ubifs_wbuf_write_nolock+0x421/0x12c0 [ubifs] write_head+0xdc/0x1c0 [ubifs] ubifs_jnl_write_inode+0x627/0x960 [ubifs] wb_workfn+0x8af/0xb80 La funci\u00f3n ubifs_wbuf_write_nolock() acepta que el par\u00e1metro 'len' no est\u00e9 alineado con 8 bytes, 'len' representa la longitud verdadera de buf (que est\u00e1 asignada en 'ubifs_jnl_xxx', p. ej. ubifs_jnl_write_inode), por lo que ubifs_wbuf_write_nolock() debe manejar la longitud le\u00edda de 'buf' con cuidado para escribir leb de forma segura. Obtenga un reproductor en [Enlace]."
}
],
"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:N/A:H",
"baseScore": 7.1,
"baseSeverity": "HIGH",
"attackVector": "LOCAL",
"attackComplexity": "LOW",
"privilegesRequired": "LOW",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"availabilityImpact": "HIGH"
},
"exploitabilityScore": 1.8,
"impactScore": 5.2
}
]
},
"weaknesses": [
{
"source": "nvd@nist.gov",
"type": "Primary",
"description": [
{
"lang": "en",
"value": "CWE-125"
}
]
}
],
"configurations": [
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.6.27",
"versionEndExcluding": "4.19.238",
"matchCriteriaId": "EF5DCB1F-AE17-4717-80C7-5786A2F74C0C"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.20",
"versionEndExcluding": "5.4.189",
"matchCriteriaId": "8CB6E8F5-C2B1-46F3-A807-0F6104AC340F"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.5",
"versionEndExcluding": "5.10.110",
"matchCriteriaId": "91D3BFD0-D3F3-4018-957C-96CCBF357D79"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.11",
"versionEndExcluding": "5.15.33",
"matchCriteriaId": "27C42AE8-B387-43E2-938A-E1C8B40BE6D5"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.16",
"versionEndExcluding": "5.16.19",
"matchCriteriaId": "20C43679-0439-405A-B97F-685BEE50613B"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.17",
"versionEndExcluding": "5.17.2",
"matchCriteriaId": "210C679C-CF84-44A3-8939-E629C87E54BF"
}
]
}
]
}
],
"references": [
{
"url": "https://git.kernel.org/stable/c/07a209fadee7b53b46858538e1177597273862e4",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
]
},
{
"url": "https://git.kernel.org/stable/c/3b7fb89135a20587d57f8877c02e25003e9edbdf",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
]
},
{
"url": "https://git.kernel.org/stable/c/4f2262a334641e05f645364d5ade1f565c85f20b",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
]
},
{
"url": "https://git.kernel.org/stable/c/5343575aa11c5d7044107d59d43f84aec01312b0",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
]
},
{
"url": "https://git.kernel.org/stable/c/a7054aaf1909cf40489c0ec1b728fdcf79c751a6",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
]
},
{
"url": "https://git.kernel.org/stable/c/b80ccbec0e4804436c382d7dd60e943c386ed83a",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
]
},
{
"url": "https://git.kernel.org/stable/c/e09fa5318d51f522e1af4fbaf8f74999355980c8",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
]
}
]
}
Reference in New Issue View Git Blame Copy Permalink