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And then osd_sparse_read() could continue where it left off.\n\n[ idryomov: changelog ]"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: \"libceph: just wait for more data to be available on the socket\". Puede ocurrir una lectura breve mientras se lee el pie de p\u00e1gina del mensaje desde el socket. M\u00e1s tarde, cuando el socket est\u00e1 listo para otra lectura, el mensajero invoca todos los controladores read_partial_*(), incluido read_partial_sparse_msg_data(). La expectativa es que read_partial_sparse_msg_data() saldr\u00eda, permitiendo al mensajero invocar read_partial() para el pie de p\u00e1gina y continuar donde lo dej\u00f3. Sin embargo, read_partial_sparse_msg_data() viola eso y termina llamando a la m\u00e1quina de estado en el cliente OSD. La m\u00e1quina de estado de lectura dispersa asume que es una nueva operaci\u00f3n e interpreta alguna parte del pie de p\u00e1gina como el encabezado de lectura dispersa y devuelve extensiones/longitud de datos falsas, etc. Para determinar si read_partial_sparse_msg_data() debe rescatarse, reutilicemos cursor->total_resid . Porque una vez que llega a cero, significa que todas las extensiones y datos se recibieron correctamente en la \u00faltima lectura; de lo contrario, podr\u00eda romperse al leer parcialmente cualquiera de las extensiones y datos. Y luego osd_sparse_read() podr\u00eda continuar donde lo dej\u00f3. 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{"bugzilla": {"description": "kernel: libceph: just wait for more data to be available on the socket", "id": "2272820", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2272820"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-20", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nlibceph: just wait for more data to be available on the socket\nA short read may occur while reading the message footer from the\nsocket. Later, when the socket is ready for another read, the\nmessenger invokes all read_partial_*() handlers, including\nread_partial_sparse_msg_data(). The expectation is that\nread_partial_sparse_msg_data() would bail, allowing the messenger to\ninvoke read_partial() for the footer and pick up where it left off.\nHowever read_partial_sparse_msg_data() violates that and ends up\ncalling into the state machine in the OSD client. The sparse-read\nstate machine assumes that it's a new op and interprets some piece of\nthe footer as the sparse-read header and returns bogus extents/data\nlength, etc.\nTo determine whether read_partial_sparse_msg_data() should bail, let's\nreuse cursor->total_resid. Because once it reaches to zero that means\nall the extents and data have been successfully received in last read,\nelse it could break out when partially reading any of the extents and\ndata. And then osd_sparse_read() could continue where it left off.\n[ idryomov: changelog ]"], "name": "CVE-2023-52636", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-04-02T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2023-52636\nhttps://nvd.nist.gov/vuln/detail/CVE-2023-52636\nhttps://lore.kernel.org/linux-cve-announce/2024040249-CVE-2023-52636-d965@gregkh/T"], "threat_severity": "Low"}

{}