{"id":3786,"date":"2021-12-15T09:12:28","date_gmt":"2021-12-15T08:12:28","guid":{"rendered":"https:\/\/www.infordisa.com\/soc\/?p=3786"},"modified":"2025-08-18T13:18:05","modified_gmt":"2025-08-18T11:18:05","slug":"log4shell-la-vulnerabilidad-de-diseno-de-proporciones-catastroficas","status":"publish","type":"post","link":"https:\/\/www.infordisa.com\/soc\/log4shell-la-vulnerabilidad-de-diseno-de-proporciones-catastroficas\/","title":{"rendered":"Log4Shell, la vulnerabilidad de dise\u00f1o de proporciones catastr\u00f3ficas"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"3786\" class=\"elementor elementor-3786\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-209027b3 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"209027b3\" 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-7d03faf0\" data-id=\"7d03faf0\" 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-7b0c8ac3 elementor-widget elementor-widget-text-editor\" data-id=\"7b0c8ac3\" 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>Hace ya unos d&iacute;as public&aacute;bamos la alerta cr&iacute;tica de <a href=\"https:\/\/www.infordisa.com\/soc\/vulnerabilidad-apache-log4j\/\">Apache Log4j<\/a>, ahora te contamos mejor el porqu&eacute; de su magnitud.<\/p><p>El problema reside en <strong>Log4j<\/strong>, una librer&iacute;a Java que se usa masivamente en sistemas empresariales y aplicaciones web. El problema ha afectado ya a servidores de Minecraft que se hackearon con un sencillo mensaje en el chat de la partida, pero la <a class=\"glossaryLink\"  href=\"https:\/\/www.infordisa.com\/soc\/glosario-definicion\/amenaza\/\"  data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex='0' role='link'>amenaza<\/a> es enorme para todo tipo de plataformas. Afortunadamente existe parche, as&iacute; que los administradores de sistemas deber&iacute;an corregir el problema cuanto antes.<\/p><h3>Un problem&oacute;n contra el que los usuarios finales pueden hacer bien poco (pero s&iacute; los administradores de sistemas)<\/h3><p>Log4j es un entorno de trabajo para registro de actividad en Apache y que permite monitorizar la actividad en una aplicaci&oacute;n. El CEO de Cloudflare, Matthew Prince, <a href=\"https:\/\/twitter.com\/eastdakota\/status\/1469350732692217863\" target=\"_blank\" rel=\"noopener\">avis&oacute;<\/a> hace unos d&iacute;as de que el problema era tan gordo que su empresa tratar&iacute;a de desplegar ciertos mecanismos para mitigarlo incluso para clientes de su servicio gratuito.<\/p><p>Todo lo que ten&iacute;a que hacer un atacante para explotar el problema es enviar un pedazo de c&oacute;digo malicioso: ese c&oacute;digo acabar&aacute; siendo registrado por Log4j si est&aacute; en su versi&oacute;n 2.0 o superior, y al hacerlo dar&aacute; acceso al atacante al sistema, que podr&aacute; ejecutar c&oacute;digo de forma remotamente.<\/p><p><a href=\"https:\/\/www.linkedin.com\/in\/freewortley\" target=\"_blank\" rel=\"noopener\">Free Wortley<\/a>, CEO de la plataforma de seguridad LunaSec, explicaba que 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> es &laquo;un fallo de dise&ntilde;o de proporciones catastr&oacute;ficas&raquo; en la librer&iacute;a, y el problema se explot&oacute; por ejemplo en los servidores de Minecraft.<\/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-36ad3c2 elementor-widget elementor-widget-html\" data-id=\"36ad3c2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<blockquote class=\"twitter-tweet\"><p lang=\"en\" dir=\"ltr\">In the case of Minecraft, attackers were able to get remote code execution on Minecraft Servers by simply pasting a a short message into the chat box.<\/p>&mdash; Marcus Hutchins (@MalwareTechBlog) <a href=\"https:\/\/twitter.com\/MalwareTechBlog\/status\/1469290238702874625?ref_src=twsrc%5Etfw\">December 10, 2021<\/a><\/blockquote> <script async src=\"https:\/\/platform.twitter.com\/widgets.js\" charset=\"utf-8\"><\/script>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-cf39652 elementor-widget elementor-widget-text-editor\" data-id=\"cf39652\" 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>Varias agencias nacionales de ciberseguridad publicaron alertas sobre el tema, y los expertos avisaban de lo f&aacute;cil que era exponer especialmente a grandes empresas que usan esa librer&iacute;a de forma habitual. La propia Apache Software Foundation calific&oacute; la vulnerabilidad &mdash;<a href=\"https:\/\/www.cisa.gov\/uscert\/ncas\/current-activity\/2021\/12\/10\/apache-releases-log4j-version-2150-address-critical-rce\" target=\"_blank\" rel=\"noopener\">corregida en Log4j 2.15.0<\/a>&mdash;&nbsp;<strong>con un &iacute;ndice de peligrosidad de 10 sobre 10<\/strong>.<\/p><p><strong>La vulnerabilidad es peculiar por muchas cosas<\/strong> pero tambi&eacute;n por una muy llamativa: esta librer&iacute;a, cr&iacute;tica para muchas plataformas, est&aacute; siendo mantenida por solo tres desarrolladores&hellip; en su tiempo libre.<\/p><p>Esos tres desarrolladores lograron atajar el problema y ya han publicado los parches que&nbsp;<strong>permiten a cualquiera administrador de sistema actualizar ese componente de sus sistemas<\/strong>&nbsp;para evitar que el problema pueda afectar a sus servicios.<\/p><p>Los usuarios finales poco pueden hacer salvo que tengan servidores en los que tengan instalados servicios y aplicaciones que puedan usar ese componente. En ese caso, como los administradores de grandes plataformas y servicios,&nbsp;<strong>la clave est&aacute; en actualizar los sistemas para que ese componente se corrija<\/strong>&nbsp;con el parche publicado por esos tres desarrolladores.<\/p><p>Fuente: <a href=\"https:\/\/www.wired.com\/story\/log4j-flaw-hacking-internet\/\" target=\"_blank\" rel=\"noopener\">Wired<\/a><br>M&aacute;s informaci&oacute;n: <a href=\"https:\/\/www.ccn-cert.cni.es\/seguridad-al-dia\/alertas-ccn-cert\/11435-ccn-cert-al-09-21-vulnerabilidad-en-apache-log4j-2.html\" target=\"_blank\" rel=\"noopener\">CCN-CERT<\/a><\/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>Hace ya unos d&iacute;as public&aacute;bamos la alerta cr&iacute;tica de Apache Log4j, ahora te contamos mejor el porqu&eacute; de su magnitud.<\/p>\n","protected":false},"author":2,"featured_media":3787,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[39],"tags":[81,82],"class_list":["post-3786","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualidad","tag-apache","tag-log4j","masonry-post","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-25"],"acf":[],"yoast_head":"<title>Log4Shell, la vulnerabilidad de dise\u00f1o de proporciones catastr\u00f3ficas - 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\/log4shell-la-vulnerabilidad-de-diseno-de-proporciones-catastroficas\/\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" 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