{"id":105318,"date":"2022-10-17T21:36:42","date_gmt":"2022-10-17T19:36:42","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-libksba-privodyashhaya-k-vypolneniyu-koda-pri-obrabotke-s-mime-v-gnupg"},"modified":"2022-10-17T21:36:42","modified_gmt":"2022-10-17T19:36:42","slug":"uyazvimost-v-libksba-privodyashhaya-k-vypolneniyu-koda-pri-obrabotke-s-mime-v-gnupg","status":"publish","type":"post","link":"https:\/\/prohoster.info\/es\/blog\/news\/uyazvimost-v-libksba-privodyashhaya-k-vypolneniyu-koda-pri-obrabotke-s-mime-v-gnupg","title":{"rendered":"Vulnerabilidad en LibKSBA que permite la ejecuci\u00f3n de c\u00f3digo al procesar S\/MIME en GnuPG","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Se ha identificado una vulnerabilidad cr\u00edtica (CVE-2022-3515) en la biblioteca LibKSBA, desarrollada por el proyecto GnuPG, que proporciona funciones para trabajar con certificados X.509. Esta vulnerabilidad puede llevar a un desbordamiento de enteros y a la escritura de datos arbitrarios fuera del b\u00fafer asignado al analizar estructuras ASN.1 utilizadas en S\/MIME, X.509 y CMS. El problema se agrava porque la biblioteca Libksba se utiliza en el paquete GnuPG, y la vulnerabilidad podr\u00eda permitir la ejecuci\u00f3n remota de c\u00f3digo del atacante al procesar datos cifrados o firmados en GnuPG (gpgsm) provenientes de archivos o correos electr\u00f3nicos que utilizan S\/MIME. En el caso m\u00e1s simple, para atacar a una v\u00edctima que usa un cliente de correo con soporte para GnuPG y S\/MIME, es suficiente con enviar un correo espec\u00edficamente dise\u00f1ado.    <\/p>\n<p>La vulnerabilidad tambi\u00e9n puede ser utilizada para atacar servidores dirmngr, encargados de descargar y analizar listas de certificados revocados (CRLs) y verificar certificados utilizados en TLS. El ataque a dirmngr puede ser realizado desde <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/es\/server\/\"   title=\"un servidor web\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"764\">un servidor web<\/a>, controlado por el atacante, mediante la entrega de CRL o certificados especialmente dise\u00f1ados. Se se\u00f1ala que a\u00fan no se han detectado exploits p\u00fablicamente disponibles para gpgsm y dirmngr, pero la vulnerabilidad es t\u00edpica y nada impide que atacantes cualificados preparen un exploit por s\u00ed mismos.    <\/p>\n<p>La vulnerabilidad ha sido arreglada en la versi\u00f3n 1.6.2 de Libksba y en los binarios de GnuPG 2.3.8. En las distribuciones de Linux, la biblioteca Libksba generalmente se ofrece como una dependencia separada, mientras que en las compilaciones para Windows est\u00e1 integrada en el paquete de instalaci\u00f3n principal de GnuPG. Despu\u00e9s de la actualizaci\u00f3n, no olvide reiniciar los procesos en segundo plano con el comando &#171;gpgconf &#8212;kill all&#187;. Para verificar la presencia del problema, en la salida del comando &#171;gpgconf &#8212;show-versions&#187;, puede evaluar el valor de la l\u00ednea &#171;KSBA &#8230;.&#187;, en la que debe figurar una versi\u00f3n no inferior a 1.6.2.    <\/p>\n<p>Las actualizaciones para las distribuciones a\u00fan no se han lanzado, pero puede seguir su aparici\u00f3n en las p\u00e1ginas: Debian, Ubuntu, Gentoo, RHEL, SUSE, Arch, FreeBSD. La vulnerabilidad tambi\u00e9n est\u00e1 presente en los paquetes MSI y AppImage con GnuPG VS-Desktop y en Gpg4win.<br \/>\n<br \/>Fuente: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=57928\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0435 LibKSBA, \u0440\u0430\u0437\u0432\u0438\u0432\u0430\u0435\u043c\u043e\u0439 \u043f\u0440\u043e\u0435\u043a\u0442\u043e\u043c GnuPG \u0438 \u043f\u0440\u0435\u0434\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u044e\u0449\u0435\u0439 \u0444\u0443\u043d\u043a\u0446\u0438\u0438 \u0434\u043b\u044f \u0440\u0430\u0431\u043e\u0442\u044b \u0441 \u0441\u0435\u0440\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u0430\u043c\u0438 X.509, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u043a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0430\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2022-3515), \u043f\u0440\u0438\u0432\u043e\u0434\u044f\u0449\u0430\u044f \u043a \u0446\u0435\u043b\u043e\u0447\u0438\u0441\u043b\u0435\u043d\u043d\u043e\u043c\u0443 \u043f\u0435\u0440\u0435\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044e \u0438 \u0437\u0430\u043f\u0438\u0441\u0438 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u043b\u044c\u043d\u044b\u0445 \u0434\u0430\u043d\u043d\u044b\u0445 \u0437\u0430 \u043f\u0440\u0435\u0434\u0435\u043b\u044b \u0432\u044b\u0434\u0435\u043b\u0435\u043d\u043d\u043e\u0433\u043e \u0431\u0443\u0444\u0435\u0440\u0430 \u043f\u0440\u0438 \u0440\u0430\u0437\u0431\u043e\u0440\u0435 \u0441\u0442\u0440\u0443\u043a\u0442\u0443\u0440 ASN.1, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u043c\u044b\u0445 \u0432 S\/MIME, X.509 \u0438 CMS. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0443\u0441\u0443\u0433\u0443\u0431\u043b\u044f\u0435\u0442\u0441\u044f \u0442\u0435\u043c, \u0447\u0442\u043e \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0430 Libksba \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u0442\u0441\u044f \u0432 \u043f\u0430\u043a\u0435\u0442\u0435 GnuPG \u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043c\u043e\u0436\u0435\u0442 \u043f\u0440\u0438\u0432\u0435\u0441\u0442\u0438 \u043a [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-105318","post","type-post","status-publish","format-standard","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=\"\u0412 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0435 LibKSBA, 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