{"id":102221,"date":"2021-11-06T03:36:40","date_gmt":"2021-11-06T01:36:40","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/zahvat-kontrolya-nad-uyazvimymi-serverami-gitlab-dlya-vovlecheniya-v-provedenie-ddos-atak"},"modified":"2021-11-06T03:36:40","modified_gmt":"2021-11-06T01:36:40","slug":"zahvat-kontrolya-nad-uyazvimymi-serverami-gitlab-dlya-vovlecheniya-v-provedenie-ddos-atak","status":"publish","type":"post","link":"https:\/\/prohoster.info\/es\/blog\/news\/zahvat-kontrolya-nad-uyazvimymi-serverami-gitlab-dlya-vovlecheniya-v-provedenie-ddos-atak","title":{"rendered":"Captura de control sobre servidores vulnerables de GitLab para involucrarlos en la realizaci\u00f3n de ataques DDoS.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>La empresa GitLab ha advertido a los usuarios sobre un aumento en la actividad de los atacantes relacionada con la explotaci\u00f3n de una vulnerabilidad cr\u00edtica CVE-2021-22205, que permite ejecutar su c\u00f3digo en el servidor que utiliza la plataforma para la organizaci\u00f3n del desarrollo colaborativo GitLab, sin necesidad de autenticaci\u00f3n.     <\/p>\n<p>El problema se manifiesta en GitLab a partir de la versi\u00f3n 11.9 y fue solucionado en abril en las versiones GitLab 13.10.3, 13.9.6 y 13.8.8. Sin embargo, seg\u00fan el escaneo realizado el 31 de octubre en la red global de 60,000 instancias p\u00fablicas disponibles de GitLab, el 50% de los sistemas siguen utilizando versiones obsoletas de GitLab, vulnerables a la explotaci\u00f3n. Las actualizaciones necesarias solo est\u00e1n instaladas en el 21% de los verificados. <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/es\/server\/\"   title=\"servidores\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"1617\">servidores<\/a>, mientras que en el 29% de los sistemas no se pudo determinar el n\u00famero de versi\u00f3n utilizada.      <\/p>\n<p>La negligencia de los administradores de servidores con GitLab en la instalaci\u00f3n de actualizaciones ha permitido que los atacantes empiecen a explotar activamente la vulnerabilidad, quienes comenzaron a alojar en <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/es\/server\/dts-gdansk\/\"   title=\"como en entornos de nube p\u00fablicos o privados.\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"4528\">como en entornos de nube p\u00fablicos o privados.<\/a> malware y conectar estos a un botnet que participa en ataques DDoS. En su punto m\u00e1ximo, el volumen de tr\u00e1fico durante el ataque DDoS, generado por el botnet basado en servidores GitLab vulnerables, alcanz\u00f3 hasta 1 terabit por segundo.      <\/p>\n<p>La vulnerabilidad se debe a un manejo incorrecto de los archivos de im\u00e1genes subidos por un analizador externo basado en la biblioteca ExifTool. La vulnerabilidad en ExifTool (CVE-2021-22204) permit\u00eda la ejecuci\u00f3n de comandos arbitrarios en el sistema al analizar los metadatos de archivos en formato DjVu:        (metadata  \t   (Copyright &#171;&#092;     &#187; . qx{echo test &gt;\\\/tmp\\\/test} . &#092;     &#187; b &#171;) )      <\/p>\n<p>Adem\u00e1s, dado que el formato real se determinaba en ExifTool por el tipo MIME del contenido y no por la extensi\u00f3n del archivo, el atacante pod\u00eda cargar un documento DjVu con un exploit disfrazado como una imagen JPG o TIFF normal (GitLab llama a ExifTool para todos los archivos con extensiones jpg, jpeg y tiff para limpiar etiquetas innecesarias). Ejemplo de exploit. En la configuraci\u00f3n predeterminada de GitLab CE, el ataque puede llevarse a cabo mediante el env\u00edo de dos solicitudes que no requieren autenticaci\u00f3n.    <center><img decoding=\"async\" alt=\"Captura de control sobre servidores vulnerables de GitLab para involucrarlos en la realizaci\u00f3n de ataques DDoS.\" src=\"\/wp-content\/uploads\/2021\/11\/b2d682aae39e05416b0e0969aef274ef.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/center>    <\/p>\n<p>Se recomienda a los usuarios de GitLab que se aseguren de estar utilizando la versi\u00f3n m\u00e1s actual y, en caso de estar utilizando una versi\u00f3n obsoleta, que instalen de inmediato las actualizaciones. Si esto no es posible por alguna raz\u00f3n, deben aplicar un parche espec\u00edfico que bloquee la explotaci\u00f3n de la vulnerabilidad. A los usuarios de sistemas no actualizados tambi\u00e9n se les aconseja verificar que su sistema no haya sido comprometido, analizando los registros y revisando la existencia de cuentas sospechosas de atacantes (por ejemplo, dexbcx, dexbcx818, dexbcxh, dexbcxi y dexbcxa99).<br \/>\n<br \/>Fuente: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=56110\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041a\u043e\u043c\u043f\u0430\u043d\u0438\u044f GitLab \u043f\u0440\u0435\u0434\u0443\u043f\u0440\u0435\u0434\u0438\u043b\u0430 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u0439 \u043e\u0431 \u0443\u0432\u0435\u043b\u0438\u0447\u0435\u043d\u0438\u0438 \u0430\u043a\u0442\u0438\u0432\u043d\u043e\u0441\u0442\u0438 \u0437\u043b\u043e\u0443\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u0438\u043a\u043e\u0432, \u0441\u0432\u044f\u0437\u0430\u043d\u043d\u043e\u0439 \u0441 \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u0435\u0439 \u043a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u043e\u0439 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 CVE-2021-22205, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0435\u0439 \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e \u0431\u0435\u0437 \u043f\u0440\u043e\u0445\u043e\u0436\u0434\u0435\u043d\u0438\u044f \u0430\u0443\u0442\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u0438 \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u0441\u0432\u043e\u0439 \u043a\u043e\u0434 \u043d\u0430 \u0441\u0435\u0440\u0432\u0435\u0440\u0435, \u043d\u0430 \u043a\u043e\u0442\u043e\u0440\u043e\u043c \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u0442\u0441\u044f \u043f\u043b\u0430\u0442\u0444\u043e\u0440\u043c\u0430 \u0434\u043b\u044f \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u0430\u0446\u0438\u0438 \u0441\u043e\u0432\u043c\u0435\u0441\u0442\u043d\u043e\u0439 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0438 GitLab. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0432 GitLab \u043d\u0430\u0447\u0438\u043d\u0430\u044f \u0441 \u0432\u0435\u0440\u0441\u0438\u0438 11.9 \u0438 \u0431\u044b\u043b\u0430 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u0435\u0449\u0451 \u0432 \u0430\u043f\u0440\u0435\u043b\u0435 \u0432 \u0432\u044b\u043f\u0443\u0441\u043a\u0430\u0445 GitLab 13.10.3, 13.9.6 \u0438 13.8.8. \u0422\u0435\u043c [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":102222,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-102221","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.2 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041a\u043e\u043c\u043f\u0430\u043d\u0438\u044f GitLab \u043f\u0440\u0435\u0434\u0443\u043f\u0440\u0435\u0434\u0438\u043b\u0430 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u0439 \u043e\u0431 \u0443\u0432\u0435\u043b\u0438\u0447\u0435\u043d\u0438\u0438 \u0430\u043a\u0442\u0438\u0432\u043d\u043e\u0441\u0442\u0438 \u0437\u043b\u043e\u0443\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u0438\u043a\u043e\u0432, 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