Se ha detectado una vulnerabilidad (CVE-2023-41913) en strongSwan, un paquete de VPN basado en el protocolo IPSec utilizado en Linux, Android, FreeBSD y macOS, que puede ser explotada para permitir la ejecuci\u00f3n remota de c\u00f3digo por un atacante. La vulnerabilidad se debe a un error en el proceso charon-tkm, que implementa el protocolo de intercambio de claves (IKE) basado en TKMv2 (Trusted Key Manager), lo que conduce a un desbordamiento de b\u00fafer al procesar valores especialmente formateados del esquema DH (Diffie\u2013Hellman). La vulnerabilidad solo se manifiesta en sistemas que utilizan charon-tkm y en las versiones de strongSwan a partir de la 5.3.0. El problema se ha solucionado en la actualizaci\u00f3n de strongSwan 5.9.12. Tambi\u00e9n se han preparado parches para corregir la vulnerabilidad en las ramas a partir de la 5.3.x. <\/p>\n
El error se debe a la falta de verificaci\u00f3n del tama\u00f1o de los valores p\u00fablicos de Diffie-Hellman antes de copiarlos en un b\u00fafer de tama\u00f1o fijo en la pila. El desbordamiento puede ser desencadenado al enviar un mensaje IKE_SA_INIT especialmente dise\u00f1ado, que se procesa sin autenticaci\u00f3n. En versiones anteriores de strongSwan, la verificaci\u00f3n del tama\u00f1o se realizaba en el manejador KE payload (Intercambio de Claves), pero en la versi\u00f3n 5.3.0 se a\u00f1adieron cambios que movieron la verificaci\u00f3n de los valores p\u00fablicos al manejador del protocolo DH (Diffie-Hellman) y se a\u00f1adieron funciones tipo para simplificar la verificaci\u00f3n de la correcci\u00f3n de los grupos DH conocidos. Por descuido, se olvid\u00f3 a\u00f1adir las nuevas funciones de verificaci\u00f3n al proceso charon-tkm, que act\u00faa como un proxy entre el proceso IKE y TKM (Trusted Key Manager), lo que result\u00f3 en que valores no verificados llegaran a la funci\u00f3n memcpy(), permitiendo escribir hasta 10,000 bytes de datos en un b\u00fafer de 512 bytes. \u0412 strongSwan, VPN-\u043f\u0430\u043a\u0435\u0442\u0435 \u043d\u0430 \u0431\u0430\u0437\u0435 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430 IPSec, \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u043c\u043e\u043c \u0432 Linux, Android, FreeBSD \u0438 macOS, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2023-41913), \u043a\u043e\u0442\u043e\u0440\u0443\u044e \u043c\u043e\u0436\u043d\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u0434\u043b\u044f \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e\u0433\u043e \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u043a\u043e\u0434\u0430 \u0437\u043b\u043e\u0443\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u0438\u043a\u0430. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432\u044b\u0437\u0432\u0430\u043d\u0430 \u043e\u0448\u0438\u0431\u043a\u043e\u0439 \u0432 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u0435 charon-tkm \u0441 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0435\u0439 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430 \u043e\u0431\u043c\u0435\u043d\u0430 \u043a\u043b\u044e\u0447\u0430\u043c\u0438 (IKE) \u043d\u0430 \u0431\u0430\u0437\u0435 TKMv2 (Trusted Key Manager), \u043f\u0440\u0438\u0432\u043e\u0434\u044f\u0449\u0435\u0439 \u043a \u043f\u0435\u0440\u0435\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044e \u0431\u0443\u0444\u0435\u0440\u0430 \u043f\u0440\u0438 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0435 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043e\u0444\u043e\u0440\u043c\u043b\u0435\u043d\u043d\u044b\u0445 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0439 \u0441\u0445\u0435\u043c\u044b DH (Diffie–Hellman). […]<\/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-111715","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Vulnerabilidad en strongSwan IPsec que conduce a la ejecuci\u00f3n remota de c\u00f3digo | ProHoster","description":"En strongSwan, un paquete VPN basado en el protocolo IPSec utilizado en Linux, Android, FreeBSD y macOS, se ha identificado una vulnerabilidad (CVE-2023-41913) que podr\u00eda ser aprovechada para la ejecuci\u00f3n remota de c\u00f3digo por un atacante.","canonical_url":"https:\/\/prohoster.info\/es\/blog\/news\/uyazvimost-v-strongswan-ipsec-privodyashhaya-k-udalyonnomu-vypolneniyu-koda","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"es_ES","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432 strongSwan IPsec, \u043f\u0440\u0438\u0432\u043e\u0434\u044f\u0449\u0430\u044f \u043a \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e\u043c\u0443 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044e \u043a\u043e\u0434\u0430 | ProHoster","og:description":"\u0412 strongSwan, VPN-\u043f\u0430\u043a\u0435\u0442\u0435 \u043d\u0430 \u0431\u0430\u0437\u0435 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430 IPSec, \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u043c\u043e\u043c \u0432 Linux, Android, FreeBSD \u0438 macOS, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2023-41913), \u043a\u043e\u0442\u043e\u0440\u0443\u044e \u043c\u043e\u0436\u043d\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u0434\u043b\u044f \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e\u0433\u043e \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u043a\u043e\u0434\u0430 \u0437\u043b\u043e\u0443\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u0438\u043a\u0430.","og:url":"https:\/\/prohoster.info\/es\/blog\/news\/uyazvimost-v-strongswan-ipsec-privodyashhaya-k-udalyonnomu-vypolneniyu-koda","og:image":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:secure_url":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:width":350,"og:image:height":350,"article:published_time":"2023-11-23T13:10:28+00:00","article:modified_time":"2023-11-23T13:10:28+00:00","article:publisher":"https:\/\/www.facebook.com\/prohoster","article:author":"https:\/\/www.facebook.com\/prohoster"},"aioseo_meta_data":[],"gt_translate_keys":[{"key":"link","format":"url"}],"_links":{"self":[{"href":"https:\/\/prohoster.info\/es\/wp-json\/wp\/v2\/posts\/111715","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/es\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/es\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/es\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/es\/wp-json\/wp\/v2\/comments?post=111715"}],"version-history":[{"count":0,"href":"https:\/\/prohoster.info\/es\/wp-json\/wp\/v2\/posts\/111715\/revisions"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/es\/wp-json\/wp\/v2\/media?parent=111715"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/es\/wp-json\/wp\/v2\/categories?post=111715"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/es\/wp-json\/wp\/v2\/tags?post=111715"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
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Fuente: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"