FKIE_CVE-2025-0685

Vulnerability from fkie_nvd - Published: 2025-03-03 18:15 - Updated: 2025-07-28 17:23
Severity ?
6.4 (Medium) - CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
6.4 (Medium) - CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
Summary
A flaw was found in grub2. When reading data from a jfs filesystem, grub's jfs filesystem module uses user-controlled parameters from the filesystem geometry to determine the internal buffer size, however, it improperly checks for integer overflows. A maliciouly crafted filesystem may lead some of those buffer size calculations to overflow, causing it to perform a grub_malloc() operation with a smaller size than expected. As a result, the grub_jfs_lookup_symlink() function will write past the internal buffer length during grub_jfs_read_file(). This issue can be leveraged to corrupt grub's internal critical data and may result in arbitrary code execution, by-passing secure boot protections.
References
secalert@redhat.comhttps://access.redhat.com/security/cve/CVE-2025-0685Vendor Advisory
secalert@redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=2346120Issue Tracking
Impacted products
Vendor Product Version
gnu grub2 *
To clipboard 

{
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    {
      "nodes": [
        {
          "cpeMatch": [
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              "criteria": "cpe:2.3:a:gnu:grub2:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "6ECC2401-511C-4A2E-878F-C7053FA3ABB1",
              "versionEndIncluding": "2.12",
              "vulnerable": true
            }
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          "operator": "OR"
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A flaw was found in grub2. When reading data from a jfs filesystem, grub\u0027s jfs filesystem module uses user-controlled parameters from the filesystem geometry to determine the internal buffer size, however, it improperly checks for integer overflows. A maliciouly crafted filesystem may lead some of those buffer size calculations to overflow, causing it to perform a grub_malloc() operation with a smaller size than expected. As a result, the grub_jfs_lookup_symlink() function will write past the internal buffer length during grub_jfs_read_file(). This issue can be leveraged to corrupt grub\u0027s internal critical data and may result in arbitrary code execution, by-passing secure boot protections."
    },
    {
      "lang": "es",
      "value": "Se encontr\u00f3 una falla en grub2. Al leer datos de un sistema de archivos jfs, el m\u00f3dulo de sistema de archivos jfs de grub utiliza par\u00e1metros controlados por el usuario de la geometr\u00eda del sistema de archivos para determinar el tama\u00f1o del b\u00fafer interno; sin embargo, verifica incorrectamente si hay desbordamientos de n\u00fameros enteros. Un sistema de archivos malipulados con fines malintencionados puede provocar que algunos de esos c\u00e1lculos de tama\u00f1o de b\u00fafer se desborden, lo que hace que realice una operaci\u00f3n grub_malloc() con un tama\u00f1o menor al esperado. Como resultado, la funci\u00f3n grub_jfs_lookup_symlink() escribir\u00e1 m\u00e1s all\u00e1 de la longitud del b\u00fafer interno durante grub_jfs_read_file(). Este problema se puede aprovechar para corromper los datos cr\u00edticos internos de grub y puede resultar en la ejecuci\u00f3n de c\u00f3digo arbitrario, eludiendo las protecciones de arranque seguro."
    }
  ],
  "id": "CVE-2025-0685",
  "lastModified": "2025-07-28T17:23:03.377",
  "metrics": {
    "cvssMetricV31": [
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          "attackComplexity": "HIGH",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 6.4,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "HIGH",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
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        "impactScore": 5.9,
        "source": "secalert@redhat.com",
        "type": "Secondary"
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          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 6.4,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "HIGH",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H",
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        "source": "nvd@nist.gov",
        "type": "Primary"
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  "published": "2025-03-03T18:15:30.733",
  "references": [
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      "tags": [
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  "sourceIdentifier": "secalert@redhat.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
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      "description": [
        {
          "lang": "en",
          "value": "CWE-787"
        }
      ],
      "source": "secalert@redhat.com",
      "type": "Secondary"
    }
  ]
}


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