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.elementor-divider-separator{width:100%;}.elementor-3567 .elementor-element.elementor-element-2207579 .elementor-divider{padding-block-start:15px;padding-block-end:15px;}</style>{"id":3567,"date":"2021-11-13T17:11:44","date_gmt":"2021-11-13T16:11:44","guid":{"rendered":"https:\/\/www.infordisa.com\/soc\/?p=3567"},"modified":"2025-08-18T13:18:20","modified_gmt":"2025-08-18T11:18:20","slug":"vulnerabilidad-en-microsoft-vmbus-virtual-machine-bus","status":"publish","type":"post","link":"https:\/\/www.infordisa.com\/soc\/vulnerabilidad-en-microsoft-vmbus-virtual-machine-bus\/","title":{"rendered":"Vulnerabilidad en Microsoft VMBus (Virtual Machine Bus)"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"3567\" class=\"elementor elementor-3567\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-514f903e elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"514f903e\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-30fa80e6\" data-id=\"30fa80e6\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-1ce803b6 elementor-widget elementor-widget-shortcode\" data-id=\"1ce803b6\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"shortcode.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-shortcode\"><span style=\"color: #c02b23;font-weight: bold\">Alta <\/span><img loading=\"lazy\" decoding=\"async\" width=\"10\" height=\"10\" src=\"https:\/\/www.infordisa.com\/soc\/imgs\/alerta-4.png\" alt=\"Alerta 4\"\/><\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-37469c0 elementor-widget elementor-widget-button\" data-id=\"37469c0\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/cve.mitre.org\/cgi-bin\/cvename.cgi?name=CVE-2021-26443\" target=\"_blank\" rel=\"nofollow\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t<span class=\"elementor-button-icon\">\n\t\t\t\t<i aria-hidden=\"true\" class=\"fas fa-external-link-alt\"><\/i>\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">CVE-2021-26443<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2207579 elementor-widget-divider--view-line elementor-widget elementor-widget-divider\" data-id=\"2207579\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"divider.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-divider\">\n\t\t\t<span class=\"elementor-divider-separator\">\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-56cd3224 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"56cd3224\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-7994e30c\" data-id=\"7994e30c\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-69b0ef3b elementor-widget elementor-widget-text-editor\" data-id=\"69b0ef3b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>El pasado d&iacute;a 9 fue detectada nueva <a class=\"glossaryLink\" href=\"https:\/\/www.infordisa.com\/soc\/glosario-definicion\/vulnerabilidad\/\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">vulnerabilidad<\/a> de ejecuci&oacute;n de c&oacute;digo remota en Microsoft Virtual Machine Bus (VMBus)<\/p>\n<h2><span style=\"color: #c00000;\">&iquest;Qu&eacute; ocurre?<\/span><\/h2>\n<p>Se trata de una vulnerabilidad de severidad alta que afecta a varias versiones de Windows Server:<\/p>\n<ul>\n<li>cpe:2.3:o:microsoft:windows_10:20h2:*:*:*:*:*:x64:*<\/li>\n<li>cpe:2.3:o:microsoft:windows_10:21h1:*:*:*:*:*:x64:*<\/li>\n<li>cpe:2.3:o:microsoft:windows_10:1809:*:*:*:*:*:x64:*<\/li>\n<li>cpe:2.3:o:microsoft:windows_10:1909:*:*:*:*:*:x64:*<\/li>\n<li>cpe:2.3:o:microsoft:windows_11:-:*:*:*:*:*:x64:*<\/li>\n<li>cpe:2.3:o:microsoft:windows_server_2016:20h2:*:*:*:*:*:*:*<\/li>\n<li>cpe:2.3:o:microsoft:windows_server_2016:2004:*:*:*:*:*:*:*<\/li>\n<li>cpe:2.3:o:microsoft:windows_server_2019:-:*:*:*:*:*:*:*<\/li>\n<li>cpe:2.3:o:microsoft:windows_server_2022:-:*:*:*:*:*:*:*<\/li>\n<\/ul>\n<h2><span style=\"color: #c00000;\">&iquest;C&oacute;mo funciona?<\/span><\/h2>\n<div>Existe una vulnerabilidad de ejecuci&oacute;n remota de c&oacute;digo cuando un invitado de VM no puede manejar correctamente la comunicaci&oacute;n en un canal VMBus. Para aprovechar la <a class=\"glossaryLink\" href=\"https:\/\/www.infordisa.com\/soc\/glosario-definicion\/vulnerabilidad\/\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">vulnerabilidad<\/a>, un atacante autenticado podr&iacute;a enviar una comunicaci&oacute;n especialmente dise&ntilde;ada en el canal VMBus desde la m&aacute;quina virtual invitada al host. Un atacante que aproveche con &eacute;xito la vulnerabilidad podr&iacute;a ejecutar c&oacute;digo arbitrario en el sistema operativo host.<\/div>\n<div>&nbsp;<\/div>\n<div>Para evitarlo, debe aplicarse la actualizaci&oacute;n tambi&eacute;n a las m&aacute;quinas guest de Hyper-V. El c&oacute;digo vulnerable se ejecuta en el host de Hyper-V, pero un cliente de Hyper-V tambi&eacute;n puede ser su propio host, por lo que la actualizaci&oacute;n debe aplicarse tanto al host como al invitado de Hyper-V.<\/div>\n<div>&nbsp;<\/div>\n<div>El impacto de dicha vulnerabilidad es alto, comprometiendo la <a class=\"glossaryLink\" href=\"https:\/\/www.infordisa.com\/soc\/glosario-definicion\/integridad\/\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">integridad<\/a>, <a class=\"glossaryLink\" href=\"https:\/\/www.infordisa.com\/soc\/glosario-definicion\/confidencialidad\/\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">confidencialidad<\/a> y el compromiso total del sistema.<\/div>\n<div>&nbsp;<\/div>\n<div>Consulta m&aacute;s informaci&oacute;n y actualizaciones en MSRC de Microsoft: <a href=\"https:\/\/msrc.microsoft.com\/update-guide\/vulnerability\/CVE-2021-26443#securityUpdates\">Security Updates<\/a><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>El pasado d&iacute;a 9 fue detectada nueva <a class=\"glossaryLink\" href=\"https:\/\/www.infordisa.com\/soc\/glosario-definicion\/vulnerabilidad\/\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">vulnerabilidad<\/a> de ejecuci&oacute;n de c&oacute;digo remota en Microsoft Virtual Machine Bus (VMBus) &iquest;Qu&eacute;<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[4],"tags":[62],"class_list":["post-3567","post","type-post","status-publish","format-standard","hentry","category-alertas-de-seguridad","tag-microsoft","masonry-post","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-25"],"acf":[],"yoast_head":"<title>Vulnerabilidad en Microsoft VMBus (Virtual Machine Bus) - 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