{"id":1705,"date":"2021-07-22T17:01:56","date_gmt":"2021-07-22T15:01:56","guid":{"rendered":"https:\/\/www.infordisa.com\/soc\/?p=1705"},"modified":"2025-08-18T13:18:26","modified_gmt":"2025-08-18T11:18:26","slug":"vulnerabilidad-en-windows-10-cve-2021-36934-sin-parche-expone-las-contrasenas-de-administrador","status":"publish","type":"post","link":"https:\/\/www.infordisa.com\/soc\/vulnerabilidad-en-windows-10-cve-2021-36934-sin-parche-expone-las-contrasenas-de-administrador\/","title":{"rendered":"Vulnerabilidad en Windows 10 (CVE-2021-36934), sin parche, expone las contrase\u00f1as de administrador"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"1705\" class=\"elementor elementor-1705\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-8ab3daa elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"8ab3daa\" 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-b4bb7b6\" data-id=\"b4bb7b6\" 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-640feab elementor-widget elementor-widget-shortcode\" data-id=\"640feab\" 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-8e187eb elementor-widget elementor-widget-button\" data-id=\"8e187eb\" 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-2021-36934\" 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-2021-36934<\/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-0fcef5c elementor-widget-divider--view-line elementor-widget elementor-widget-divider\" data-id=\"0fcef5c\" 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-1fad71d elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"1fad71d\" 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-1bc8938\" data-id=\"1bc8938\" 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-bf02b97 elementor-widget elementor-widget-text-editor\" data-id=\"bf02b97\" 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 calor de julio no est&aacute; trayendo buenas noticias para los usuarios de Microsoft Windows 10. Ya hace unos d&iacute;as habl&aacute;bamos del <a href=\"https:\/\/www.infordisa.com\/soc\/microsoft-publica-el-parche-para-la-vulnerabilidad-print-nightmare\/\">PrintNightmare<\/a>, pues bien, parece que ahora estrenamos otro episodio, el llamado &ldquo;HiveNightmare&rdquo; o &ldquo;SeriousSAM&rdquo;.<\/p><p>El investigador de seguridad Jonas Lykkegaard fue el primero en detectarlo. Por parte de Microsoft, el d&iacute;a 20 de julio se ha confirmado que se trata de una 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> cr&iacute;tica que afecta al sistema operativo Windows 10 (<a href=\"https:\/\/msrc.microsoft.com\/update-guide\/vulnerability\/CVE-2021-36934\" target=\"_blank\" rel=\"noopener\">CVE-2021-36934<\/a>).<\/p><p>Concretamente la vulnerabilidad se encuentra en el archivo Security Account Manager (SAM). Un atacante con privilegios de usuario local limitados podr&iacute;a obtener las contrase&ntilde;as hash y usarlas con relativa facilidad para elevar sus privilegios a administrador. A partir de all&iacute;, el atacante puede tener control absoluto para hacer lo que quiera.<\/p><h2>&iquest;Qu&eacute; nos cuenta Microsoft de CVE-2021-36934?<\/h2><p>Seg&uacute;n Microsoft, un atacante puede &laquo;instalar programas; ver, cambiar o eliminar datos; o crear nuevas cuentas con derechos de usuario completos&raquo;. Todas las versiones de Windows 10 desde 1809 en adelante, son vulnerables a este ataque.<\/p><p>Adem&aacute;s, se da la particularidad que la &lsquo;instant&aacute;nea&rsquo; de la unidad del sistema donde se pueden encontrar estos archivos se crea cuando alguien realiza una actualizaci&oacute;n de Windows si esa unidad tiene m&aacute;s de 128 GB. Por lo tanto, incluso si su versi&oacute;n de Windows 10 no se vio afectada inicialmente, podr&iacute;a serlo despu&eacute;s de la actualizaci&oacute;n.<\/p><h2>&iquest;Existe alguna soluci&oacute;n?<\/h2><p>Lamentablemente, por el momento, <strong>todav&iacute;a no existe ning&uacute;n parche<\/strong>.<\/p><p>Microsoft ha emitido una soluci&oacute;n alternativa para restringir el acceso mediante el s&iacute;mbolo del sistema o PowerShell y luego eliminar los puntos de restauraci&oacute;n del sistema existentes. Esa soluci&oacute;n se puede encontrar <a href=\"https:\/\/msrc.microsoft.com\/update-guide\/vulnerability\/CVE-2021-36934#workarounds\" target=\"_blank\" rel=\"noopener\">aqu&iacute;<\/a>.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<section class=\"elementor-section elementor-inner-section elementor-element elementor-element-b2463dc elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"b2463dc\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t\t<div class=\"elementor-background-overlay\"><\/div>\n\t\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-inner-column elementor-element elementor-element-4b0eec8\" data-id=\"4b0eec8\" 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-bdc229d elementor-widget elementor-widget-text-editor\" data-id=\"bdc229d\" 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><strong>Restringir el acceso al contenido de% windir% \\ system32 \\ config<\/strong><\/p><p>S&iacute;mbolo del sistema (ejecutar como administrador):&nbsp;<code>icacls %windir%\\system32\\config\\*.* \/inheritance:e<\/code><\/p><p>Windows PowerShell (ejecutar como administrador):&nbsp;<code>icacls $env:windir\\system32\\config\\*.* \/inheritance:e<\/code><\/p><p><strong>Eliminar instant&aacute;neas del Servicio de instant&aacute;neas de volumen (VSS)<\/strong><\/p><ol><li>Elimine los puntos de restauraci&oacute;n del sistema y los vol&uacute;menes de sombra que exist&iacute;an antes de restringir el acceso a% windir% \\ system32 \\ config.<\/li><li>Cree un nuevo punto de restauraci&oacute;n del sistema (si lo desea).<\/li><\/ol><p><strong>Impacto de la soluci&oacute;n alternativa:<\/strong>&nbsp;Eliminar las instant&aacute;neas podr&iacute;a afectar las operaciones de restauraci&oacute;n, incluida la capacidad de restaurar datos con aplicaciones de respaldo de terceros.&nbsp;Para obtener m&aacute;s informaci&oacute;n sobre c&oacute;mo eliminar instant&aacute;neas, consulte&nbsp;<a href=\"https:\/\/support.microsoft.com\/topic\/1ceaa637-aaa3-4b58-a48b-baf72a2fa9e7\" target=\"_blank\" rel=\"noopener\">KB5005357- Eliminar instant&aacute;neas de volumen<\/a>.<\/p><p><strong>Nota:<\/strong>&nbsp;Debe restringir el acceso&nbsp;<em>y<\/em>&nbsp;eliminar instant&aacute;neas para evitar la explotaci&oacute;n de esta vulnerabilidad.<\/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 class=\"elementor-element elementor-element-ee225c9 elementor-widget elementor-widget-text-editor\" data-id=\"ee225c9\" 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><br>Des de el SOC de Infordisa estaremos atentos a cualquier novedad.<\/p>\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-7259e48 elementor-alert-info elementor-widget elementor-widget-alert\" data-id=\"7259e48\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"alert.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-alert\" role=\"alert\">\n\n\t\t\t\t\t\t<span class=\"elementor-alert-title\">Actualizaci&oacute;n de Microsoft 27\/07\/2021<\/span>\n\t\t\t\n\t\t\t\t\t\t<span class=\"elementor-alert-description\">Se han realizado las siguientes revisiones: 1) Se eliminaron las versiones de Windows Server de la tabla Actualizaciones de seguridad, ya que no se ven afectadas por esta <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>. 2) Se actualiz&oacute; la informaci&oacute;n de la soluci&oacute;n alternativa con una precauci&oacute;n con respecto a la restauraci&oacute;n de un sistema desde la copia de seguridad.<\/span>\n\t\t\t\n\t\t\t\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<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>El calor de julio no est&aacute; trayendo buenas noticias para los usuarios de Microsoft Windows 10. Ya hace unos d&iacute;as<\/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":[51],"class_list":["post-1705","post","type-post","status-publish","format-standard","hentry","category-alertas-de-seguridad","tag-windows-10","masonry-post","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-25"],"acf":[],"yoast_head":"<title>Vulnerabilidad en Windows 10 (CVE-2021-36934), sin parche, expone las contrase\u00f1as de administrador - INFORDISA \/ Security Operations Center<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.infordisa.com\/soc\/vulnerabilidad-en-windows-10-cve-2021-36934-sin-parche-expone-las-contrasenas-de-administrador\/\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Vulnerabilidad en Windows 10 (CVE-2021-36934), sin parche, expone las contrase\u00f1as de administrador - INFORDISA \/ Security Operations Center\" \/>\n<meta property=\"og:description\" content=\"El calor de julio no est&aacute; trayendo buenas noticias para los usuarios de Microsoft Windows 10. 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