CVE-2025-0678

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When reading data from a squash4 filesystem, grub's squash4 fs module uses user-controlled parameters from the filesystem geometry to determine the internal buffer size, however, it improperly checks for integer overflows. A maliciously 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 direct_read() will perform a heap based out-of-bounds write during data reading. This flaw may be leveraged to corrupt grub's 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 squash4, el m\u00f3dulo fs squash4 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 manipulado 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, direct_read() realizar\u00e1 una escritura fuera de los l\u00edmites basada en el mont\u00f3n durante la lectura de datos. 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