<style id="elementor-post-2173">.elementor-2173 .elementor-element.elementor-element-86247a0{margin-top:-20px;margin-bottom:0px;}.elementor-2173 .elementor-element.elementor-element-b251e6a > .elementor-widget-wrap > .elementor-widget:not(.elementor-widget__width-auto):not(.elementor-widget__width-initial):not(:last-child):not(.elementor-absolute){margin-block-end:5px;}.elementor-2173 .elementor-element.elementor-element-b251e6a > .elementor-element-populated{padding:0px 0px 20px 0px;}.elementor-2173 .elementor-element.elementor-element-5334356 .elementor-button{background-color:#FFFEE0;fill:#C00000;color:#C00000;padding:0px 0px 0px 0px;}.elementor-2173 .elementor-element.elementor-element-5334356 .elementor-button-content-wrapper{flex-direction:row-reverse;}.elementor-2173 .elementor-element.elementor-element-5334356 .elementor-button:hover, .elementor-2173 .elementor-element.elementor-element-5334356 .elementor-button:focus{color:#000000;}.elementor-2173 .elementor-element.elementor-element-5334356 .elementor-button:hover svg, .elementor-2173 .elementor-element.elementor-element-5334356 .elementor-button:focus svg{fill:#000000;}.elementor-2173 .elementor-element.elementor-element-cdd4b19{--divider-border-style:solid;--divider-color:#0000001A;--divider-border-width:1px;}.elementor-2173 .elementor-element.elementor-element-cdd4b19 .elementor-divider-separator{width:100%;}.elementor-2173 .elementor-element.elementor-element-cdd4b19 .elementor-divider{padding-block-start:15px;padding-block-end:15px;}</style>{"id":2173,"date":"2021-09-08T12:37:39","date_gmt":"2021-09-08T10:37:39","guid":{"rendered":"https:\/\/www.infordisa.com\/soc\/?p=2173"},"modified":"2025-08-18T13:18:24","modified_gmt":"2025-08-18T11:18:24","slug":"vulnerabilitat-a-la-execucio-remota-de-codi-mshtml","status":"publish","type":"post","link":"https:\/\/www.infordisa.com\/soc\/ca\/vulnerabilidad-en-la-ejecucion-remota-de-codigo-mshtml\/","title":{"rendered":"Vulnerabilitat en l&#039;execuci\u00f3 remota de codi MSHTML"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"2173\" class=\"elementor elementor-2173\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-86247a0 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"86247a0\" 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-b251e6a\" data-id=\"b251e6a\" 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-50f370c elementor-widget elementor-widget-shortcode\" data-id=\"50f370c\" 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\">Cr&iacute;tica <\/span><img loading=\"lazy\" decoding=\"async\" width=\"10\" height=\"10\" src=\"https:\/\/www.infordisa.com\/soc\/imgs\/alerta-5.png\" alt=\"Alerta 5\"\/><\/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-5334356 elementor-widget elementor-widget-button\" data-id=\"5334356\" 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-2021-40444\" 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-2021-40444<\/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-cdd4b19 elementor-widget-divider--view-line elementor-widget elementor-widget-divider\" data-id=\"cdd4b19\" 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-ae875e3 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"ae875e3\" 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-164c90b\" data-id=\"164c90b\" 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-11c0935 elementor-widget elementor-widget-text-editor\" data-id=\"11c0935\" 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>Empezamos curso con una nueva <a class=\"glossaryLink\" href=\"https:\/\/www.infordisa.com\/soc\/ca\/glosario-definicion\/vulnerabilidad\/\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">vulnerabilidad<\/a>, un <a class=\"glossaryLink\" href=\"https:\/\/www.infordisa.com\/soc\/ca\/glosario-definicion\/ataque-de-dia-cero\/\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">ataque de d&iacute;a 0<\/a> (zero day), la <a class=\"glossaryLink\"  href=\"https:\/\/www.infordisa.com\/soc\/ca\/glosario-definicion\/cve\/\"  data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex='0' role='link'>CVE<\/a>-2021-40444 que afecta a la mayor&iacute;a de versiones de sistemas operativos <strong>Windows Server desde 2008 hasta 2019<\/strong>&nbsp;y&nbsp;<strong>Windows desde la versi&oacute;n 7 a la 10<\/strong>. Los usuarios m&aacute;s vulnerables a este tipo de ataques son los que operan con cuentas con derechos administrativos.<\/p><h2><span style=\"color: #c00000;\">&iquest;Qu&eacute; ocurre?<\/span><\/h2><p>Se trata de una vulnerabilidad de severidad alta que afecta a varias versiones de Windows mediante un componente de Internet Explorer, MSHTML, que se utiliza para mostrar documentos.<\/p><p>Esta vulnerabilidad usada en documentos de Microsoft Office permitir&aacute; a un ciberatacante realizar una ejecuci&oacute;n remota de c&oacute;digo en el sistema vulnerable.<\/p><h2><span style=\"color: #c00000;\">&iquest;Qu&eacute; podemos hacer?<\/span><\/h2><p>La soluci&oacute;n propuesta por Microsoft es deshabilitar la instalaci&oacute;n de todos los controles ActiveX en Internet Explorer para mitigar este ataque. Esto se puede lograr para todos los sitios actualizando el registro. Los controles ActiveX instalados anteriormente seguir&aacute;n ejecut&aacute;ndose, pero no se exponen a esta <a class=\"glossaryLink\" href=\"https:\/\/www.infordisa.com\/soc\/ca\/glosario-definicion\/vulnerabilidad\/\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">vulnerabilidad<\/a>.<\/p><p><strong>Advertencia:<\/strong> Si usa el Editor del Registro incorrectamente, puede causar serios problemas que pueden requerir que reinstale su sistema operativo. Microsoft e Infordisa no puede garantizar que pueda resolver los problemas que resulten del uso incorrecto del Editor del Registro. Utilice el Editor del registro bajo su propia responsabilidad.<\/p><p><strong>Para deshabilitar los controles ActiveX en un sistema individual:<\/strong><\/p><ol><li>Para deshabilitar la instalaci&oacute;n de controles ActiveX en Internet Explorer en todas las zonas, pegue lo siguiente en un archivo de texto y gu&aacute;rdelo con la extensi&oacute;n de archivo .reg:<\/li><\/ol>\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-00517cc elementor-widget elementor-widget-code-highlight\" data-id=\"00517cc\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"code-highlight.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"prismjs-default copy-to-clipboard \">\n\t\t\t<pre data-line=\"\" class=\"highlight-height language-markup line-numbers\">\n\t\t\t\t<code readonly class=\"language-markup\">\n\t\t\t\t\t<xmp>Windows Registry Editor Version 5.00\r\n\r\n[HKEY_LOCAL_MACHINE\\SOFTWARE\\Policies\\Microsoft\\Windows\\CurrentVersion\\Internet Settings\\Zones\\0]\r\n\"1001\"=dword:00000003\r\n\"1004\"=dword:00000003\r\n\r\n[HKEY_LOCAL_MACHINE\\SOFTWARE\\Policies\\Microsoft\\Windows\\CurrentVersion\\Internet Settings\\Zones\\1]\r\n\"1001\"=dword:00000003\r\n\"1004\"=dword:00000003\r\n\r\n[HKEY_LOCAL_MACHINE\\SOFTWARE\\Policies\\Microsoft\\Windows\\CurrentVersion\\Internet Settings\\Zones\\2]\r\n\"1001\"=dword:00000003\r\n\"1004\"=dword:00000003\r\n\r\n[HKEY_LOCAL_MACHINE\\SOFTWARE\\Policies\\Microsoft\\Windows\\CurrentVersion\\Internet Settings\\Zones\\3]\r\n\"1001\"=dword:00000003\r\n\"1004\"=dword:00000003<\/xmp>\n\t\t\t\t<\/code>\n\t\t\t<\/pre>\n\t\t<\/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-804bc7f elementor-widget elementor-widget-text-editor\" data-id=\"804bc7f\" 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<ol start=\"2\">\n<li><span>Haga doble clic en el archivo .reg para aplicarlo a su secci&oacute;n de pol&iacute;ticas.<\/span><\/li>\n<li><span>Reinicie el sistema para asegurarse de que se aplique la nueva configuraci&oacute;n.<\/span><\/li>\n<\/ol>\n<p><strong><span>Impacto de la soluci&oacute;n alternativa.<\/span><\/strong><\/p>\n<p><span>Esto establece la URLACTION_DOWNLOAD_SIGNED_ACTIVEX (0x1001) y la URLACTION_DOWNLOAD_UNSIGNED_ACTIVEX (0x1004) en DISABLED (3) para todas las zonas de Internet para procesos de 64 y 32 bits.&nbsp;No se instalar&aacute;n nuevos controles ActiveX.&nbsp;Los controles ActiveX instalados anteriormente seguir&aacute;n ejecut&aacute;ndose.<\/span><\/p>\n<p><strong><span>C&oacute;mo deshacer la soluci&oacute;n alternativa<\/span><\/strong><\/p>\n<p><span>Elimine las claves de registro que se agregaron al implementar esta soluci&oacute;n.<\/span><\/p>\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>Comencem curs amb una nova vulnerabilitat, un atac de dia 0 (zero day), la CVE-2021-40444 que afecta la majoria<\/p>","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":[78,62,36],"class_list":["post-2173","post","type-post","status-publish","format-standard","hentry","category-alertas-de-seguridad","tag-0-day","tag-microsoft","tag-windows","masonry-post","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-25"],"acf":[],"yoast_head":"<title>Vulnerabilidad en la ejecuci\u00f3n remota de c\u00f3digo MSHTML - 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