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Las reglas de modificaci\u00f3n de la CAN frame permiten operaciones l\u00f3gicas a nivel de bits que tambi\u00e9n se pueden aplicar en el campo can_dlc. El usuario con privilegios \"root\" con CAP_NET_ADMIN puede crear una regla de modificaci\u00f3n de CAN frame que genera que el c\u00f3digo de longitud de datos tenga un valor m\u00e1s alto que el tama\u00f1o de datos que CAN frame tenga disponible. 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{"bugzilla": {"description": "kernel: Missing check in net/can/gw.c:can_can_gw_rcv() allows for crash by users with CAP_NET_ADMIN", "id": "1663729", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1663729"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-787", "details": ["An issue was discovered in can_can_gw_rcv in net/can/gw.c in the Linux kernel through 4.19.13. The CAN frame modification rules allow bitwise logical operations that can be also applied to the can_dlc field. The privileged user \"root\" with CAP_NET_ADMIN can create a CAN frame modification rule that makes the data length code a higher value than the available CAN frame data size. In combination with a configured checksum calculation where the result is stored relatively to the end of the data (e.g. cgw_csum_xor_rel) the tail of the skb (e.g. frag_list pointer in skb_shared_info) can be rewritten which finally can cause a system crash. Because of a missing check, the CAN drivers may write arbitrary content beyond the data registers in the CAN controller's I/O memory when processing can-gw manipulated outgoing frames.", "An issue was discovered in can_can_gw_rcv() in the net/can/gw.c in the Linux kernel. The CAN driver may write arbitrary content beyond the data registers in the CAN controller's I/O memory when processing can-gw manipulated outgoing frames because of a missing check. A local user with CAP_NET_ADMIN capability granted in the initial namespace can exploit this vulnerability to cause a system crash and thus a denial of service (DoS)."], "name": "CVE-2019-3701", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 5"}, {"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-alt", "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:/a:redhat:enterprise_mrg:2", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise MRG 2"}], "public_date": "2018-12-28T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2019-3701\nhttps://nvd.nist.gov/vuln/detail/CVE-2019-3701"]}