{"id":13379,"date":"2025-12-17T10:12:53","date_gmt":"2025-12-17T09:12:53","guid":{"rendered":"https:\/\/www.infordisa.com\/soc\/?p=13379"},"modified":"2025-12-17T12:23:55","modified_gmt":"2025-12-17T11:23:55","slug":"microsoft-elimina-el-xifratge-rc4","status":"publish","type":"post","link":"https:\/\/www.infordisa.com\/soc\/ca\/microsoft-elimina-el-cifrado-rc4\/","title":{"rendered":"Microsoft elimina el xifrat RC4 despr\u00e9s de 25 anys"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"13379\" class=\"elementor elementor-13379\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-40bffee e-flex e-con-boxed e-con e-parent\" data-id=\"40bffee\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-64cbdb4 elementor-widget elementor-widget-text-editor\" data-id=\"64cbdb4\" 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>Microsoft ha anunciado oficialmente que <strong>el <a class=\"glossaryLink\"  href=\"https:\/\/www.infordisa.com\/soc\/ca\/glosario-definicion\/cifrado\/\"  data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex='0' role='link'>cifrado<\/a> RC4 dejar&aacute; de estar soportado por defecto en Windows a partir de mediados de 2026<\/strong>, poniendo fin a una de las vulnerabilidades m&aacute;s persistentes del ecosistema Windows. Aunque RC4 llevaba d&eacute;cadas considerado inseguro, segu&iacute;a siendo el algoritmo predeterminado en Active Directory, lo que ha permitido numerosos ataques en entornos corporativos.<\/p><h2>&iquest;Qu&eacute; implica para la ciberseguridad empresarial?<\/h2><p>Este cambio supone un hito importante para la seguridad de las organizaciones, especialmente aquellas con infraestructuras heredadas o dependientes de Active Directory.<\/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-53f77d9 elementor-widget-divider--view-line elementor-widget elementor-widget-divider\" data-id=\"53f77d9\" 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<div class=\"elementor-element elementor-element-44817e1 elementor-widget elementor-widget-text-editor\" data-id=\"44817e1\" 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<h2>&iquest;Qu&eacute; es RC4 y por qu&eacute; ha sido un problema durante tanto tiempo?<\/h2><p>RC4 (Rivest Cipher 4) es un algoritmo de cifrado de flujo creado en 1987. Su rapidez y simplicidad lo convirtieron en un est&aacute;ndar de facto en protocolos como <a class=\"glossaryLink\"  href=\"https:\/\/www.infordisa.com\/soc\/ca\/glosario-definicion\/ssl\/\"  data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex='0' role='link'>SSL<\/a>\/TLS, WEP y, posteriormente, en <strong>Active Directory<\/strong>, donde Microsoft lo adopt&oacute; como cifrado predeterminado en el a&ntilde;o 2000.<\/p><p>Sin embargo, desde hace m&aacute;s de dos d&eacute;cadas se conocen vulnerabilidades cr&iacute;ticas:<\/p><ul><li>Filtraci&oacute;n del algoritmo en 1994<\/li><li>Ataques como <strong>BEAST<\/strong>, capaces de descifrar informaci&oacute;n<\/li><li>Debilidades graves con claves cortas o implementaciones incorrectas<\/li><li>Explotaciones masivas como <strong>Kerberoasting<\/strong>, que aprovecha RC4 para robar credenciales Kerberos<\/li><\/ul><p>A pesar de ello, RC4 ha seguido presente en Windows debido a su integraci&oacute;n hist&oacute;rica en Active Directory, lo que ha mantenido expuestos a miles de entornos corporativos.<\/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-29d7757 elementor-widget elementor-widget-image\" data-id=\"29d7757\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"300\" height=\"134\" src=\"https:\/\/www.infordisa.com\/soc\/wp-content\/uploads\/2025\/12\/RC4.svg-300x134.png\" class=\"attachment-medium size-medium wp-image-13387\" alt=\"\" srcset=\"https:\/\/www.infordisa.com\/soc\/wp-content\/uploads\/2025\/12\/RC4.svg-300x134.png 300w, https:\/\/www.infordisa.com\/soc\/wp-content\/uploads\/2025\/12\/RC4.svg-1024x458.png 1024w, https:\/\/www.infordisa.com\/soc\/wp-content\/uploads\/2025\/12\/RC4.svg-768x344.png 768w, https:\/\/www.infordisa.com\/soc\/wp-content\/uploads\/2025\/12\/RC4.svg-1536x687.png 1536w, https:\/\/www.infordisa.com\/soc\/wp-content\/uploads\/2025\/12\/RC4.svg-2048x916.png 2048w, https:\/\/www.infordisa.com\/soc\/wp-content\/uploads\/2025\/12\/RC4.svg-18x8.png 18w\" sizes=\"(max-width: 300px) 100vw, 300px\"\/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Esquema del cifrado RC4<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\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-d6dc1b3 elementor-widget-divider--view-line elementor-widget elementor-widget-divider\" data-id=\"d6dc1b3\" 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<div class=\"elementor-element elementor-element-ca4c2e9 elementor-widget elementor-widget-text-editor\" data-id=\"ca4c2e9\" 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<h2>Ataques reales que evidencian el riesgo<\/h2><p>La persistencia de RC4 no ha sido un problema te&oacute;rico. Ha facilitado ataques de alto impacto, como:<\/p><ul><li><p><strong>Kerberoasting<\/strong>, una t&eacute;cnica ampliamente utilizada por grupos de <a class=\"glossaryLink\" href=\"https:\/\/www.infordisa.com\/soc\/ca\/glosario-definicion\/ransomware\/\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">ransomware<\/a> para comprometer redes completas.<\/p><\/li><li><p>El ataque a <strong>Ascension<\/strong>, una gran organizaci&oacute;n sanitaria estadounidense, que afect&oacute; a 140 hospitales y expuso los datos de 5,6 millones de pacientes.<\/p><\/li><\/ul><p>La situaci&oacute;n lleg&oacute; a tal punto que un senador estadounidense acus&oacute; a Microsoft de &ldquo;grave negligencia de seguridad&rdquo; por mantener RC4 activo durante tanto tiempo.<\/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-cdfd064 elementor-widget-divider--view-line elementor-widget elementor-widget-divider\" data-id=\"cdfd064\" 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<div class=\"elementor-element elementor-element-9dec71d elementor-widget elementor-widget-text-editor\" data-id=\"9dec71d\" 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<h2>&iquest;Qu&eacute; cambia ahora?<\/h2><p>Microsoft ha confirmado que:<\/p><ul><li><p><strong>RC4 se desactivar&aacute; por defecto<\/strong> en Windows Server 2008 y versiones posteriores.<\/p><\/li><li><p>Solo se permitir&aacute; <strong>AES-SHA1<\/strong> como algoritmo predeterminado para Kerberos.<\/p><\/li><li><p>RC4 solo podr&aacute; activarse manualmente por un administrador, y &uacute;nicamente en casos excepcionales.<\/p><\/li><\/ul><blockquote><p>Por primera vez en 25 a&ntilde;os, la <a class=\"glossaryLink\" href=\"https:\/\/www.infordisa.com\/soc\/ca\/glosario-definicion\/autenticacion\/\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">autenticaci&oacute;n<\/a> en Windows dejar&aacute; de depender de RC4.<\/p><\/blockquote>\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-aeac650 elementor-widget-divider--view-line elementor-widget elementor-widget-divider\" data-id=\"aeac650\" 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<div class=\"elementor-element elementor-element-b1becff elementor-widget elementor-widget-text-editor\" data-id=\"b1becff\" 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<h2>Impacto para las empresas: qu&eacute; deben revisar los equipos de seguridad<\/h2><p>Este cambio afecta directamente a:<\/p><ul><li><p><strong>Controladores de dominio<\/strong><\/p><\/li><li><p><strong>Servicios y aplicaciones legacy<\/strong> que dependan de RC4<\/p><\/li><li><p><strong>Integraciones antiguas con Active Directory<\/strong><\/p><\/li><li><p><strong>Sistemas que utilicen Kerberos con configuraciones heredadas<\/strong><\/p><\/li><\/ul><p>Para muchas organizaciones, la transici&oacute;n ser&aacute; transparente. Pero en entornos con sistemas antiguos, puede provocar fallos de autenticaci&oacute;n si no se revisa previamente.<\/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-ce94683 elementor-widget-divider--view-line elementor-widget elementor-widget-divider\" data-id=\"ce94683\" 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<div class=\"elementor-element elementor-element-435520a elementor-widget elementor-widget-text-editor\" data-id=\"435520a\" 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<h2>Recomendaciones desde Infordisa<\/h2><p>Para garantizar una transici&oacute;n segura y sin interrupciones, recomendamos:<\/p><h3>1. <strong>Auditar el uso actual de RC4<\/strong><\/h3><p>Identificar servicios, cuentas o aplicaciones que a&uacute;n dependan de este <a class=\"glossaryLink\"  href=\"https:\/\/www.infordisa.com\/soc\/ca\/glosario-definicion\/cifrado\/\"  data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex='0' role='link'>cifrado<\/a>.<\/p><h3>2. <strong>Actualizar o reemplazar sistemas legacy<\/strong><\/h3><p>Especialmente aquellos que no soporten AES-SHA1.<\/p><h3>3. <strong>Revisar configuraciones de Kerberos<\/strong><\/h3><p>Asegurar que todos los controladores de dominio y servicios utilizan algoritmos modernos.<\/p><h3>4. <strong>Monitorizar intentos de Kerberoasting<\/strong><\/h3><p>Aprovechar la retirada de RC4 para reforzar la detecci&oacute;n de ataques basados en credenciales.<\/p><h3>5. <strong>Planificar la transici&oacute;n antes de 2026<\/strong><\/h3><p>No esperar al cambio autom&aacute;tico para evitar interrupciones en servicios cr&iacute;ticos.<\/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-ee6e881 elementor-widget-divider--view-line elementor-widget elementor-widget-divider\" data-id=\"ee6e881\" 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<div class=\"elementor-element elementor-element-4c9084d elementor-widget elementor-widget-text-editor\" data-id=\"4c9084d\" 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<h2>Conclusi&oacute;n<\/h2><p>La retirada de RC4 es una decisi&oacute;n tard&iacute;a, pero necesaria. Supone un avance importante para la seguridad del ecosistema Windows y una oportunidad para que las organizaciones revisen y fortalezcan sus mecanismos de autenticaci&oacute;n.<\/p><p>Desde de Infordisa acompa&ntilde;amos a las empresas en este proceso, ayudando a identificar riesgos, actualizar sistemas y garantizar una transici&oacute;n segura hacia est&aacute;ndares criptogr&aacute;ficos modernos.<\/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\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>El xifratge RC4 deixar\u00e0 d&#039;estar a Windows a partir de mitjans del 2026, posant fi a una de les vulnerabilitats m\u00e9s persistents.<\/p>","protected":false},"author":2,"featured_media":13381,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[39],"tags":[44,158,207],"class_list":["post-13379","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualidad","tag-ciberseguridad","tag-hackeo","tag-hacking","masonry-post","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-25"],"acf":[],"yoast_head":"<title>Microsoft elimina el cifrado RC4 tras 25 a\u00f1os - INFORDISA \/ Security Operations Center<\/title>\n<meta name=\"description\" content=\"El cifrado RC4 dejar\u00e1 de estar en Windows a partir de mediados de 2026, poniendo fin a una de las vulnerabilidades m\u00e1s persistentes.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link 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