<style id="elementor-post-3516">.elementor-3516 .elementor-element.elementor-element-e5a00a0{margin-top:-20px;margin-bottom:0px;}.elementor-3516 .elementor-element.elementor-element-484f916 > .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-3516 .elementor-element.elementor-element-484f916 > .elementor-element-populated{padding:0px 0px 20px 0px;}.elementor-3516 .elementor-element.elementor-element-e903651{--divider-border-style:solid;--divider-color:#0000001A;--divider-border-width:1px;}.elementor-3516 .elementor-element.elementor-element-e903651 .elementor-divider-separator{width:100%;}.elementor-3516 .elementor-element.elementor-element-e903651 .elementor-divider{padding-block-start:15px;padding-block-end:15px;}/* Start custom CSS for text-editor, class: .elementor-element-6528245 */.elementor-3516 .elementor-element.elementor-element-6528245 a {
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}/* End custom CSS */</style>{"id":3516,"date":"2021-11-10T11:47:03","date_gmt":"2021-11-10T10:47:03","guid":{"rendered":"https:\/\/www.infordisa.com\/soc\/?p=3516"},"modified":"2025-08-18T13:18:21","modified_gmt":"2025-08-18T11:18:21","slug":"8-vulnerabilitats-critiques-corregides-en-mozilla-firefox","status":"publish","type":"post","link":"https:\/\/www.infordisa.com\/soc\/ca\/8-vulnerabilidades-criticas-corregidas-en-mozilla-firefox\/","title":{"rendered":"8 vulnerabilitats cr\u00edtiques corregides a Mozilla Firefox"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"3516\" class=\"elementor elementor-3516\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-e5a00a0 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"e5a00a0\" 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-484f916\" data-id=\"484f916\" 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-038cf95 elementor-widget elementor-widget-shortcode\" data-id=\"038cf95\" 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-6528245 elementor-widget elementor-widget-text-editor\" data-id=\"6528245\" 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<div><strong><a href=\"https:\/\/www.mozilla.org\/en-US\/security\/advisories\/mfsa2021-48\/\" target=\"_blank\" rel=\"noopener\">Firefox 94 update<\/a><\/strong><\/div>\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-e903651 elementor-widget-divider--view-line elementor-widget elementor-widget-divider\" data-id=\"e903651\" 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-11b4d9a elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"11b4d9a\" 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-7e865150\" data-id=\"7e865150\" 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-6f65988f elementor-widget elementor-widget-text-editor\" data-id=\"6f65988f\" 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>Mozilla Firefox ha anunciando la&nbsp;<strong>correcci&oacute;n de varias vulnerabilidades<\/strong>&nbsp;en la versi&oacute;n de <strong>Firefox 94<\/strong>, entre las que se encuentran&nbsp;<strong>8 vulnerabilidades de riesgo alto<\/strong>.<\/p><h2>Detalles<\/h2><p>Dichas vulnerabilidades de riesgo alto, han sido clasificadas con los c&oacute;digos&nbsp;<a href=\"https:\/\/cve.mitre.org\/cgi-bin\/cvename.cgi?name=CVE-2021-38503\" target=\"_blank\" rel=\"noopener\">CVE-2021-38503<\/a>,&nbsp;<a href=\"https:\/\/cve.mitre.org\/cgi-bin\/cvename.cgi?name=CVE-2021-38504\" target=\"_blank\" rel=\"noopener\">CVE-2021-38504<\/a>,&nbsp;<a href=\"https:\/\/cve.mitre.org\/cgi-bin\/cvename.cgi?name=CVE-2021-38505\" target=\"_blank\" rel=\"noopener\">CVE-2021-38505<\/a>,&nbsp;<a href=\"https:\/\/cve.mitre.org\/cgi-bin\/cvename.cgi?name=CVE-2021-38506\" target=\"_blank\" rel=\"noopener\">CVE-2021-38506<\/a>,&nbsp;<a href=\"https:\/\/cve.mitre.org\/cgi-bin\/cvename.cgi?name=CVE-2021-38507\" target=\"_blank\" rel=\"noopener\">CVE-2021-38507<\/a>,&nbsp;<a href=\"https:\/\/www.mozilla.org\/en-US\/security\/advisories\/mfsa2021-48\/\" target=\"_blank\" rel=\"noopener\">MOZ-2021-0003<\/a>&nbsp;y&nbsp;<a href=\"https:\/\/www.mozilla.org\/en-US\/security\/advisories\/mfsa2021-48\/\" target=\"_blank\" rel=\"noopener\">MOZ-2021-0007<\/a>. A continuaci&oacute;n, mostramos el detalle:<\/p><ul><li><strong>MOZ-2021-0003<\/strong>: Vulnerabilidad de tipo&nbsp;<strong>Cross-Site Scripting (<a class=\"glossaryLink\"  href=\"https:\/\/www.infordisa.com\/soc\/ca\/glosario-definicion\/xss\/\"  data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex='0' role='link'>XSS<\/a>)<\/strong>&nbsp;que afectaba a las versiones de Mozilla Firefox para Android, debido a un&nbsp;<strong>fallo de saneamiento de los datos de entrada<\/strong>&nbsp;<strong>introducidos en una <a class=\"glossaryLink\"  href=\"https:\/\/www.infordisa.com\/soc\/ca\/glosario-definicion\/url\/\"  data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex='0' role='link'>URL<\/a><\/strong>&nbsp;a trav&eacute;s de un<strong>&nbsp;c&oacute;digo QR<\/strong>.<\/li><li><strong>MOZ-2021-0007<\/strong>: Corrige&nbsp;<strong>m&uacute;ltiples fallos de seguridad relacionados con la corrupci&oacute;n de memoria<\/strong>, los cuales podr&iacute;an haber sido aprovechados para ejecutar c&oacute;digo.<\/li><li><strong><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>-2021-38503<\/strong>: Las reglas definidas en el <a class=\"glossaryLink\"  href=\"https:\/\/www.infordisa.com\/soc\/ca\/glosario-definicion\/sandbox\/\"  data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex='0' role='link'>sandbox<\/a> iframe no se aplicaban correctamente para las hojas de estilo XSLT, lo que permit&iacute;a a un atacante&nbsp;<strong>saltarse la restricci&oacute;n impuesta por el sandbox para ejecutar c&oacute;digo<\/strong>&nbsp;o acceder a informaci&oacute;n de un frame superior.<\/li><li><strong>CVE-2021-38504<\/strong>: Es posible la<strong>&nbsp;ejecuci&oacute;n de c&oacute;digo a trav&eacute;s de una <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> de tipo &lsquo;<em>use-after-free<\/em>&lsquo;<\/strong>, durante la interacci&oacute;n con un elemento de entrada HTML de un di&aacute;logo del componente &lsquo;<em>webkitdirectory<\/em>&lsquo;.<\/li><li><strong>CVE-2021-38505<\/strong>: El servicio &lsquo;<em>Cloud Clipboard<\/em>&lsquo; de Windows 10 permite almacenar los datos copiados al portapapeles en la nube y hacerlos disponibles a otros usuarios bajo determinados criterios. Aquellas aplicaciones que deseen&nbsp;<strong>prevenir la copia de datos<\/strong>&nbsp;del portapapeles en la nube,&nbsp;<strong>deben implementar un formato espec&iacute;fico de portapapeles<\/strong>. Las&nbsp;<strong>versiones de Mozilla Firefox anteriores a la 94 no implementaban dicho formato<\/strong>, pudiendo haber afectado a alg&uacute;n usuario mediante la&nbsp;<strong>fuga de informaci&oacute;n sensible<\/strong>.<\/li><li><strong><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>-2021-38506<\/strong>: Versiones anteriores de Mozilla Firefox 94 permit&iacute;an&nbsp;<strong>habilitar el modo de pantalla completa<\/strong>&nbsp;a trav&eacute;s de la navegaci&oacute;n,&nbsp;<strong>sin notificar o alertar al usuario<\/strong>. Esto podr&iacute;a desencadenar en&nbsp;<strong>ataques de tipo <a class=\"glossaryLink\"  href=\"https:\/\/www.infordisa.com\/soc\/ca\/glosario-definicion\/phishing\/\"  data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex='0' role='link'>phishing<\/a>, e incluso ataques de <a class=\"glossaryLink\" href=\"https:\/\/www.infordisa.com\/soc\/ca\/glosario-definicion\/suplantacion-de-identidad\/\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">suplantaci&oacute;n de identidad<\/a><\/strong>.<\/li><li><strong>CVE-2021-38507<\/strong>: La funci&oacute;n de &lsquo;<em><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> oportunista<\/em>&lsquo;, introducida con el <a class=\"glossaryLink\"  href=\"https:\/\/www.infordisa.com\/soc\/ca\/glosario-definicion\/protocolo\/\"  data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex='0' role='link'>protocolo<\/a> HTTP2, permite que una conexi&oacute;n se actualice a TLS conservando las propiedades de la conexi&oacute;n <a class=\"glossaryLink\"  href=\"https:\/\/www.infordisa.com\/soc\/ca\/glosario-definicion\/http\/\"  data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex='0' role='link'>HTTP<\/a> sin cifrar. Sin embargo, si exist&iacute;a un segundo puerto sin &lsquo;<em>cifrado oportunista<\/em>&lsquo;,&nbsp;<strong>un atacante podr&iacute;a reenviar una conexi&oacute;n del navegador<\/strong>&nbsp;a dicho puerto (por ejemplo, del puerto 443), haciendo que el navegador<strong>&nbsp;lo tratara como HTTP<\/strong>. Debido a la limitaci&oacute;n del uso de este &lsquo;<em>cifrado oportunista<\/em>&lsquo;, se ha optado por deshabilitarlo de forma permanente.<\/li><\/ul><h2>Soluci&oacute;n<\/h2><p>Desde el Security Operations Center de Infordisa, recomendamos <strong>actualizar siempre todo nuestro software, es este caso el navegador Mozilla Firefox a la versi&oacute;n 94<\/strong>, la cual corrige las vulnerabilidades citadas anteriormente, adem&aacute;s de otras de menor riesgo.<\/p><p>Es importante verificar que el navegador tenga las actualizaciones autom&aacute;ticas activadas. Para ello, vaya a &laquo;Ajustes&raquo; (bot&oacute;n superior derecho) y en la secci&oacute;n de &laquo;General&raquo;, en la parte de &laquo;Actualizaciones de Firefox&raquo;, verifique que est&eacute; marcada la opci&oacute;n.<\/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-c6c27a6 elementor-widget elementor-widget-image\" data-id=\"c6c27a6\" 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\t\t\t\t<a href=\"https:\/\/www.infordisa.com\/soc\/wp-content\/uploads\/2021\/11\/Firefox-94.png\" data-elementor-open-lightbox=\"yes\" data-elementor-lightbox-title=\"Firefox-94\" data-e-action-hash=\"#elementor-action%3Aaction%3Dlightbox%26settings%3DeyJpZCI6MzUxOCwidXJsIjoiaHR0cHM6XC9cL3d3dy5pbmZvcmRpc2EuY29tXC9zb2NcL3dwLWNvbnRlbnRcL3VwbG9hZHNcLzIwMjFcLzExXC9GaXJlZm94LTk0LnBuZyJ9\">\n\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"693\" height=\"468\" src=\"https:\/\/www.infordisa.com\/soc\/wp-content\/uploads\/2021\/11\/Firefox-94.png\" class=\"attachment-large size-large wp-image-3518\" alt=\"\" srcset=\"https:\/\/www.infordisa.com\/soc\/wp-content\/uploads\/2021\/11\/Firefox-94.png 693w, https:\/\/www.infordisa.com\/soc\/wp-content\/uploads\/2021\/11\/Firefox-94-300x203.png 300w, https:\/\/www.infordisa.com\/soc\/wp-content\/uploads\/2021\/11\/Firefox-94-18x12.png 18w\" sizes=\"(max-width: 693px) 100vw, 693px\"\/>\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\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>Mozilla Firefox ha anunciat la correcci\u00f3 de diverses vulnerabilitats en la versi\u00f3 de Firefox 94, entre les quals hi ha 8 vulnerabilitats de<\/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":[75],"class_list":["post-3516","post","type-post","status-publish","format-standard","hentry","category-alertas-de-seguridad","tag-firefox","masonry-post","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-25"],"acf":[],"yoast_head":"<title>8 vulnerabilidades cr\u00edticas corregidas en Mozilla Firefox - 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\/ca\/8-vulnerabilitats-critiques-corregides-en-mozilla-firefox\/\" \/>\n<meta property=\"og:locale\" content=\"ca_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"8 vulnerabilidades cr\u00edticas corregidas en Mozilla Firefox - INFORDISA \/ Security Operations Center\" \/>\n<meta property=\"og:description\" content=\"Mozilla Firefox ha anunciando la&nbsp;correcci&oacute;n de varias vulnerabilidades&nbsp;en la versi&oacute;n de Firefox 94, entre las que se encuentran&nbsp;8 vulnerabilidades de\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.infordisa.com\/soc\/ca\/8-vulnerabilitats-critiques-corregides-en-mozilla-firefox\/\" \/>\n<meta property=\"og:site_name\" content=\"INFORDISA \/ Security Operations Center\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/infordisa\/\" \/>\n<meta property=\"article:published_time\" content=\"2021-11-10T10:47:03+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-08-18T11:18:21+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.infordisa.com\/soc\/wp-content\/uploads\/2021\/11\/Firefox-94.png\" \/>\n<meta name=\"author\" content=\"Jordi Sala\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@infordisa\" \/>\n<meta name=\"twitter:site\" content=\"@infordisa\" \/>\n<meta name=\"twitter:label1\" content=\"Escrit per\" \/>\n\t<meta name=\"twitter:data1\" content=\"Jordi Sala\" \/>\n\t<meta name=\"twitter:label2\" content=\"Temps estimat de lectura\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minuts\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.infordisa.com\\\/soc\\\/8-vulnerabilidades-criticas-corregidas-en-mozilla-firefox\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.infordisa.com\\\/soc\\\/8-vulnerabilidades-criticas-corregidas-en-mozilla-firefox\\\/\"},\"author\":{\"name\":\"Jordi Sala\",\"@id\":\"https:\\\/\\\/www.infordisa.com\\\/soc\\\/#\\\/schema\\\/person\\\/9e7088b9a88f62117d466d94479b2375\"},\"headline\":\"8 vulnerabilidades cr\u00edticas corregidas en Mozilla Firefox\",\"datePublished\":\"2021-11-10T10:47:03+00:00\",\"dateModified\":\"2025-08-18T11:18:21+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.infordisa.com\\\/soc\\\/8-vulnerabilidades-criticas-corregidas-en-mozilla-firefox\\\/\"},\"wordCount\":516,\"publisher\":{\"@id\":\"https:\\\/\\\/www.infordisa.com\\\/soc\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.infordisa.com\\\/soc\\\/8-vulnerabilidades-criticas-corregidas-en-mozilla-firefox\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.infordisa.com\\\/soc\\\/wp-content\\\/uploads\\\/2021\\\/11\\\/Firefox-94.png\",\"keywords\":[\"Firefox\"],\"articleSection\":[\"Alertas de seguridad\"],\"inLanguage\":\"ca\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.infordisa.com\\\/soc\\\/8-vulnerabilidades-criticas-corregidas-en-mozilla-firefox\\\/\",\"url\":\"https:\\\/\\\/www.infordisa.com\\\/soc\\\/8-vulnerabilidades-criticas-corregidas-en-mozilla-firefox\\\/\",\"name\":\"8 vulnerabilidades cr\u00edticas corregidas en Mozilla Firefox - 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