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nvd-json-data-feeds/CVE-2021/CVE-2021-472xx/CVE-2021-47288.json
cad-safe-bot 1d9e392288 Auto-Update: 2024-12-23T17:00:20.791343+00:00
2024-12-23 17:03:43 +00:00

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{
"id": "CVE-2021-47288",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2024-05-21T15:15:16.867",
"lastModified": "2024-12-23T16:45:23.720",
"vulnStatus": "Analyzed",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: ngene: Fix out-of-bounds bug in ngene_command_config_free_buf()\n\nFix an 11-year old bug in ngene_command_config_free_buf() while\naddressing the following warnings caught with -Warray-bounds:\n\narch/alpha/include/asm/string.h:22:16: warning: '__builtin_memcpy' offset [12, 16] from the object at 'com' is out of the bounds of referenced subobject 'config' with type 'unsigned char' at offset 10 [-Warray-bounds]\narch/x86/include/asm/string_32.h:182:25: warning: '__builtin_memcpy' offset [12, 16] from the object at 'com' is out of the bounds of referenced subobject 'config' with type 'unsigned char' at offset 10 [-Warray-bounds]\n\nThe problem is that the original code is trying to copy 6 bytes of\ndata into a one-byte size member _config_ of the wrong structue\nFW_CONFIGURE_BUFFERS, in a single call to memcpy(). This causes a\nlegitimate compiler warning because memcpy() overruns the length\nof &com.cmd.ConfigureBuffers.config. It seems that the right\nstructure is FW_CONFIGURE_FREE_BUFFERS, instead, because it contains\n6 more members apart from the header _hdr_. Also, the name of\nthe function ngene_command_config_free_buf() suggests that the actual\nintention is to ConfigureFreeBuffers, instead of ConfigureBuffers\n(which takes place in the function ngene_command_config_buf(), above).\n\nFix this by enclosing those 6 members of struct FW_CONFIGURE_FREE_BUFFERS\ninto new struct config, and use &com.cmd.ConfigureFreeBuffers.config as\nthe destination address, instead of &com.cmd.ConfigureBuffers.config,\nwhen calling memcpy().\n\nThis also helps with the ongoing efforts to globally enable\n-Warray-bounds and get us closer to being able to tighten the\nFORTIFY_SOURCE routines on memcpy()."
},
{
"lang": "es",
"value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: medios: ngene: corrige un error fuera de los l\u00edmites en ngene_command_config_free_buf(). Corrige un error de hace 11 a\u00f1os en ngene_command_config_free_buf() mientras se solucionan las siguientes advertencias detectadas con -Warray-bounds: arch/alpha/include/asm/string.h:22:16: advertencia: el desplazamiento '__builtin_memcpy' [12, 16] del objeto en 'com' est\u00e1 fuera de los l\u00edmites del subobjeto referenciado 'config' con tipo 'car\u00e1cter sin firmar ' en el desplazamiento 10 [-Warray-bounds] arch/x86/include/asm/string_32.h:182:25: advertencia: el desplazamiento '__builtin_memcpy' [12, 16] del objeto en 'com' est\u00e1 fuera de los l\u00edmites de subobjeto referenciado 'config' con tipo 'unsigned char' en el desplazamiento 10 [-Warray-bounds] El problema es que el c\u00f3digo original est\u00e1 intentando copiar 6 bytes de datos en un miembro de tama\u00f1o de un byte _config_ de la estructura incorrecta FW_CONFIGURE_BUFFERS, en una sola llamada a memcpy(). Esto provoca una advertencia leg\u00edtima del compilador porque memcpy() sobrepasa la longitud de &com.cmd.ConfigureBuffers.config. Parece que la estructura correcta es FW_CONFIGURE_FREE_BUFFERS, porque contiene 6 miembros m\u00e1s adem\u00e1s del encabezado _hdr_. Adem\u00e1s, el nombre de la funci\u00f3n ngene_command_config_free_buf() sugiere que la intenci\u00f3n real es ConfigureFreeBuffers, en lugar de ConfigureBuffers (que tiene lugar en la funci\u00f3n ngene_command_config_buf(), arriba). Solucione este problema encerrando esos 6 miembros de la estructura FW_CONFIGURE_FREE_BUFFERS en una nueva configuraci\u00f3n de estructura y use &com.cmd.ConfigureFreeBuffers.config como direcci\u00f3n de destino, en lugar de &com.cmd.ConfigureBuffers.config, al llamar a memcpy(). Esto tambi\u00e9n ayuda con los esfuerzos continuos para habilitar globalmente -Warray-bounds y acercarnos a poder ajustar las rutinas FORTIFY_SOURCE en memcpy()."
}
],
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{
"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"
}
]
}
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