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Small USB packets are combined into a single, large transfer request, to reduce the overhead and improve performance. The combined size of the bulk transfer is used to dynamically allocate a variable length array (VLA) on the stack without proper validation. Since the total size is not bounded, a malicious guest could use this flaw to influence the array length and cause the QEMU process to perform an excessive allocation on the stack, resulting in a denial of service."}, {"lang": "es", "value": "Se encontr\u00f3 un fallo en el dispositivo redirector USB (usb-redir) de QEMU. Los paquetes USB peque\u00f1os son combinados en una \u00fanica petici\u00f3n de transferencia grande para reducir la sobrecarga y mejorar el rendimiento. El tama\u00f1o combinado de la transferencia masiva es usado para asignar din\u00e1micamente una matriz de longitud variable (VLA) en la pila sin la comprobaci\u00f3n apropiada. Dado que el tama\u00f1o total no est\u00e1 limitado, un hu\u00e9sped malicioso podr\u00eda usar este fallo para influir en la longitud de la matriz y causar a un proceso QEMU llevar a cabo una asignaci\u00f3n excesiva en la pila, resultando en una denegaci\u00f3n de servicio"}], "id": "CVE-2021-3527", "lastModified": 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{"acknowledgement": "Red Hat would like to thank Remy Noel (Blade Group) for reporting this issue.", "bugzilla": {"description": "QEMU: usb: unbounded stack allocation in usbredir", "id": "1955695", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1955695"}, "csaw": false, "cvss3": {"cvss3_base_score": "3.2", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:L", "status": "draft"}, "cwe": "CWE-770", "details": ["A flaw was found in the USB redirector device (usb-redir) of QEMU. Small USB packets are combined into a single, large transfer request, to reduce the overhead and improve performance. The combined size of the bulk transfer is used to dynamically allocate a variable length array (VLA) on the stack without proper validation. Since the total size is not bounded, a malicious guest could use this flaw to influence the array length and cause the QEMU process to perform an excessive allocation on the stack, resulting in a denial of service.", "A flaw was found in the USB redirector device (usb-redir) of QEMU. Small USB packets are combined into a single, large transfer request, to reduce the overhead and improve performance. The combined size of the bulk transfer is used to dynamically allocate a variable length array (VLA) on the stack without proper validation. Since the total size is not bounded, a malicious guest could use this flaw to influence the array length and cause the QEMU process to perform an excessive allocation on the stack, resulting in a denial of service. The highest threat from this vulnerability is to system availability."], "name": "CVE-2021-3527", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "qemu-kvm", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "qemu-kvm", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "qemu-kvm-ma", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "qemu-kvm-rhev", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Will not fix", "package_name": "virt:rhel/qemu-kvm", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/a:redhat:advanced_virtualization:8::el8", "fix_state": "Will not fix", "package_name": "virt:8.2/qemu-kvm", "product_name": "Red Hat Enterprise Linux 8 Advanced Virtualization"}, {"cpe": "cpe:/a:redhat:advanced_virtualization:8::el8", "fix_state": "Will not fix", "package_name": "virt:8.3/qemu-kvm", "product_name": "Red Hat Enterprise Linux 8 Advanced Virtualization"}, {"cpe": "cpe:/a:redhat:advanced_virtualization:8::el8", "fix_state": "Will not fix", "package_name": "virt:av/qemu-kvm", "product_name": "Red Hat Enterprise Linux 8 Advanced Virtualization"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "qemu-kvm", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openstack:10", "fix_state": "Out of support scope", "package_name": "qemu-kvm-rhev", "product_name": "Red Hat OpenStack Platform 10 (Newton)"}, {"cpe": "cpe:/a:redhat:openstack:13", "fix_state": "Out of support scope", "package_name": "qemu-kvm-rhev", "product_name": "Red Hat OpenStack Platform 13 (Queens)"}], "public_date": "2021-04-30T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-3527\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-3527\nhttps://www.openwall.com/lists/oss-security/2021/05/05/5"], "statement": "This issue affects the version of `qemu-kvm` as shipped with Red Hat Enterprise Linux 8 and Red Hat Enterprise Linux 8 Advanced Virtualization. A future update may address this flaw.", "threat_severity": "Low"}