{"id":417,"date":"2021-06-22T09:03:38","date_gmt":"2021-06-22T07:03:38","guid":{"rendered":"https:\/\/www.infordisa.com\/soc\/?p=417"},"modified":"2025-08-18T13:18:29","modified_gmt":"2025-08-18T11:18:29","slug":"1-error-en-ios-permet-que-xarxes-wi-fi-amb-noms-especials-deixin-teu-iphone-sense-connexio","status":"publish","type":"post","link":"https:\/\/www.infordisa.com\/soc\/ca\/un-error-en-ios-permite-que-redes-wi-fi-con-nombres-especiales-dejen-tu-iphone-sin-conexion\/","title":{"rendered":"Un error en iOS permet que xarxes Wi-Fi amb noms especials deixin teu iPhone sense connexi\u00f3"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"417\" class=\"elementor elementor-417\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-a2fd720 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"a2fd720\" 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-1b98836\" data-id=\"1b98836\" 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-e5de72b elementor-widget elementor-widget-shortcode\" data-id=\"e5de72b\" 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\">Alta <\/span><img loading=\"lazy\" decoding=\"async\" width=\"10\" height=\"10\" src=\"https:\/\/www.infordisa.com\/soc\/imgs\/alerta-4.png\" alt=\"Alerta 4\"\/><\/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-d5e8632 elementor-widget-divider--view-line elementor-widget elementor-widget-divider\" data-id=\"d5e8632\" 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-4973254 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"4973254\" 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-0ea9376\" data-id=\"0ea9376\" 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-ce5ad11 elementor-widget elementor-widget-text-editor\" data-id=\"ce5ad11\" 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>Se ha detectado un error en el sistema operativo m&oacute;vil de Apple que permite romper la funcionalidad Wi-Fi del dispositivo si &eacute;ste se conecta a una red con un nombre especial.<\/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-8391168 elementor-widget elementor-widget-image\" data-id=\"8391168\" 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<img fetchpriority=\"high\" decoding=\"async\" width=\"900\" height=\"568\" src=\"https:\/\/www.infordisa.com\/soc\/wp-content\/uploads\/2021\/06\/iphone.jpg\" class=\"attachment-large size-large wp-image-419\" alt=\"\" srcset=\"https:\/\/www.infordisa.com\/soc\/wp-content\/uploads\/2021\/06\/iphone.jpg 900w, https:\/\/www.infordisa.com\/soc\/wp-content\/uploads\/2021\/06\/iphone-300x189.jpg 300w, https:\/\/www.infordisa.com\/soc\/wp-content\/uploads\/2021\/06\/iphone-768x485.jpg 768w, https:\/\/www.infordisa.com\/soc\/wp-content\/uploads\/2021\/06\/iphone-16x10.jpg 16w\" sizes=\"(max-width: 900px) 100vw, 900px\"\/>\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<div class=\"elementor-element elementor-element-2dca9c5 elementor-widget elementor-widget-text-editor\" data-id=\"2dca9c5\" 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 pasado viernes, el investigador de seguridad&nbsp;<a href=\"https:\/\/twitter.com\/vm_call\/status\/1405937492642123782\" target=\"_blank\" rel=\"noopener\">Carl Schou<\/a>&nbsp;publicaba un tweet en el que se pod&iacute;a apreciar como su la funcionalidad Wi-Fi de su dispositivo deja de funcionar correctamente.<strong>&nbsp;En el v&iacute;deo compartido podemos observar como en la interfaz encargada de mostrar las lista de redes Wi-Fi en iOS, al activar el Wi-Fi, &eacute;ste es desactivado inmediatamente<\/strong>. Este comportamiento impide que el usuario pueda conectarse a otras redes.<\/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-6d36ad9 elementor-widget elementor-widget-shortcode\" data-id=\"6d36ad9\" 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\"><blockquote class=\"twitter-tweet\"><p lang=\"en\" dir=\"ltr\">After joining my personal <a class=\"glossaryLink\" href=\"https:\/\/www.infordisa.com\/soc\/ca\/glosario-definicion\/wifi\/\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">WiFi<\/a> with the SSID &ldquo;%p%s%s%s%s%n&rdquo;, my iPhone permanently disabled it&rsquo;s WiFi functionality. Neither rebooting nor changing SSID fixes it :~) <a href=\"https:\/\/t.co\/2eue90JFu3\">pic.twitter.com\/2eue90JFu3<\/a><\/p>&mdash; Carl Schou (@vm_call) <a href=\"https:\/\/twitter.com\/vm_call\/status\/1405937492642123782?ref_src=twsrc%5Etfw\">June 18, 2021<\/a><\/blockquote> <script async src=\"https:\/\/platform.twitter.com\/widgets.js\" charset=\"utf-8\"><\/script><\/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-05758e9 elementor-widget elementor-widget-text-editor\" data-id=\"05758e9\" 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 su tweet, Carl afirma que el problema ha comenzado cuando se intentado conectarse a su propia red, a la que hab&iacute;a cambiado el nombre por &laquo;%p%s%s%s%s%n&raquo;.&nbsp;<strong>Esta cadena de texto puede utilizarse para tratar de detectar fallos de seguridad del tipo &laquo;<a href=\"https:\/\/es.wikipedia.org\/wiki\/Format_String_Attack\" target=\"_blank\" rel=\"noopener\">Format String<\/a>&laquo;<\/strong>, en los que se aprovecha la llamada directa con la entrada del usuario a funciones que reciben una cadena de formato.<\/p><p>Tras publicarse el tweet, Zhi Zhou, ingeniero de seguridad de Ant Financial Light-Year Security Labs, public&oacute; en su&nbsp;<a href=\"https:\/\/blog.chichou.me\/2021\/06\/20\/quick-analysis-wifid\/\" target=\"_blank\" rel=\"noopener\">blog<\/a>&nbsp;su investigaci&oacute;n sobre este problema. El problema se encuentra en una parte del c&oacute;digo del&nbsp;<em>daemon<\/em>&nbsp;de Wi-Fi del sistema operativo de Apple (<em>wifid<\/em>). &Eacute;ste demonio se encarga de la conectividad inal&aacute;mbrica del dispositivo, y en un cierto momento,&nbsp;<strong>&eacute;ste trata de escribir un mensaje en el&nbsp;<em>log<\/em>&nbsp;del dispositivo incluyendo el nombre de la red Wi-Fi a la que el usuario trata de conectarse<\/strong>.<\/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-c592db5 elementor-widget elementor-widget-image\" data-id=\"c592db5\" 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=\"692\" height=\"194\" src=\"https:\/\/www.infordisa.com\/soc\/wp-content\/uploads\/2021\/06\/logger.png\" class=\"attachment-large size-large wp-image-420\" alt=\"\" srcset=\"https:\/\/www.infordisa.com\/soc\/wp-content\/uploads\/2021\/06\/logger.png 692w, https:\/\/www.infordisa.com\/soc\/wp-content\/uploads\/2021\/06\/logger-300x84.png 300w, https:\/\/www.infordisa.com\/soc\/wp-content\/uploads\/2021\/06\/logger-16x4.png 16w\" sizes=\"(max-width: 692px) 100vw, 692px\"\/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Ejecuci&oacute;n del logger que produce el problema (Fuente: Zhi Zhou) <\/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-a4e0e61 elementor-widget elementor-widget-text-editor\" data-id=\"a4e0e61\" 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>La funci&oacute;n de&nbsp;<em>logging<\/em>&nbsp;utilizada permite pasar una cadena de formato, y&nbsp;<strong>el c&oacute;digo de&nbsp;<em>wifid<\/em>&nbsp;le proporciona directamente el nombre de la red como cadena de formato<\/strong>, lo que permite que se produzca la <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&nbsp;<em>Format String<\/em>.<\/p><p>Aunque se trate de una vulnerabilidad,&nbsp;<strong>Zhi Zhou ha indicado que no cree que sea explotable<\/strong>, lo que impedir&iacute;a que pueda ser aprovechada en ataques a dispositivos iOS. De momento solamente es posible utilizar este error para causar una denegaci&oacute;n en el dispositivo, que no ser&aacute; capaz de conectar a redes Wi-Fi tras la explotaci&oacute;n, al menos hasta que el usuario realice un&nbsp;<em>reset<\/em>&nbsp;de la configuraci&oacute;n de red (yendo a Ajustes-&gt;General-&gt;Restablecer-&gt;Restablecer ajustes de red).<\/p><p><strong>M&aacute;s informaci&oacute;n<\/strong><\/p><p><strong>Fuente<\/strong>:&nbsp;<a href=\"https:\/\/blog.chichou.me\/2021\/06\/20\/quick-analysis-wifid\/\" target=\"_blank\" rel=\"noopener\">https:\/\/blog.chichou.me\/2021\/06\/20\/quick-analysis-wifid\/<\/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>S&#039;ha detectat un error al sistema operatiu m\u00f2bil d&#039;Apple que permet trencar la funcionalitat Wi-Fi del dispositiu<\/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":[28],"class_list":["post-417","post","type-post","status-publish","format-standard","hentry","category-alertas-de-seguridad","tag-ios","masonry-post","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-25"],"acf":[],"yoast_head":"<title>Un error en iOS permite que redes Wi-Fi con nombres especiales dejen tu iPhone sin conexi\u00f3n - INFORDISA \/ Security Operations Center<\/title>\n<meta name=\"description\" content=\"Se ha detectado un error en el sistema operativo m\u00f3vil de Apple que permite romper la funcionalidad Wi-Fi del dispositivo si \u00e9ste se conecta a una red con un nombre especial.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, 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