fkie_cve-2021-47288
Vulnerability from fkie_nvd
Published
2024-05-21 15:15
Modified
2024-12-23 16:45
Severity ?
7.1 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: media: ngene: Fix out-of-bounds bug in ngene_command_config_free_buf() Fix an 11-year old bug in ngene_command_config_free_buf() while addressing the following warnings caught with -Warray-bounds: arch/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] arch/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] The problem is that the original code is trying to copy 6 bytes of data into a one-byte size member _config_ of the wrong structue FW_CONFIGURE_BUFFERS, in a single call to memcpy(). This causes a legitimate compiler warning because memcpy() overruns the length of &com.cmd.ConfigureBuffers.config. It seems that the right structure is FW_CONFIGURE_FREE_BUFFERS, instead, because it contains 6 more members apart from the header _hdr_. Also, the name of the function ngene_command_config_free_buf() suggests that the actual intention is to ConfigureFreeBuffers, instead of ConfigureBuffers (which takes place in the function ngene_command_config_buf(), above). Fix this by enclosing those 6 members of struct FW_CONFIGURE_FREE_BUFFERS into new struct config, and use &com.cmd.ConfigureFreeBuffers.config as the destination address, instead of &com.cmd.ConfigureBuffers.config, when calling memcpy(). This also helps with the ongoing efforts to globally enable -Warray-bounds and get us closer to being able to tighten the FORTIFY_SOURCE routines on memcpy().
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4487b968e5eacd02c493303dc2b61150bb7fe4b2Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8d4abca95ecc82fc8c41912fa0085281f19cc29fPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b9a178f189bb6d75293573e181928735f5e3e070Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c6ddeb63dd543b5474b0217c4e47538b7ffd7686Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e617fa62f6cf859a7b042cdd6c73af905ff8fca3Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e818f2ff648581a6c553ae2bebc5dcef9a8bb90cPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e991457afdcb5f4dbc5bc9d79eaf775be33e7092Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ec731c6ef564ee6fc101fc5d73e3a3a953d09a00Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/4487b968e5eacd02c493303dc2b61150bb7fe4b2Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/8d4abca95ecc82fc8c41912fa0085281f19cc29fPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/b9a178f189bb6d75293573e181928735f5e3e070Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/c6ddeb63dd543b5474b0217c4e47538b7ffd7686Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/e617fa62f6cf859a7b042cdd6c73af905ff8fca3Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/e818f2ff648581a6c553ae2bebc5dcef9a8bb90cPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/e991457afdcb5f4dbc5bc9d79eaf775be33e7092Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/ec731c6ef564ee6fc101fc5d73e3a3a953d09a00Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 5.14
linux linux_kernel 5.14


To clipboard 

{
  "configurations": [
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  "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: \u0027__builtin_memcpy\u0027 offset [12, 16] from the object at \u0027com\u0027 is out of the bounds of referenced subobject \u0027config\u0027 with type \u0027unsigned char\u0027 at offset 10 [-Warray-bounds]\narch/x86/include/asm/string_32.h:182:25: warning: \u0027__builtin_memcpy\u0027 offset [12, 16] from the object at \u0027com\u0027 is out of the bounds of referenced subobject \u0027config\u0027 with type \u0027unsigned char\u0027 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 \u0026com.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 \u0026com.cmd.ConfigureFreeBuffers.config as\nthe destination address, instead of \u0026com.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 \u0027__builtin_memcpy\u0027 [12, 16] del objeto en \u0027com\u0027 est\u00e1 fuera de los l\u00edmites del subobjeto referenciado \u0027config\u0027 con tipo \u0027car\u00e1cter sin firmar \u0027 en el desplazamiento 10 [-Warray-bounds] arch/x86/include/asm/string_32.h:182:25: advertencia: el desplazamiento \u0027__builtin_memcpy\u0027 [12, 16] del objeto en \u0027com\u0027 est\u00e1 fuera de los l\u00edmites de subobjeto referenciado \u0027config\u0027 con tipo \u0027unsigned char\u0027 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 \u0026amp;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 \u0026amp;com.cmd.ConfigureFreeBuffers.config como direcci\u00f3n de destino, en lugar de \u0026amp;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()."
    }
  ],
  "id": "CVE-2021-47288",
  "lastModified": "2024-12-23T16:45:23.720",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.1,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.2,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2024-05-21T15:15:16.867",
  "references": [
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-125"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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