{"id":111715,"date":"2023-11-23T15:10:28","date_gmt":"2023-11-23T13:10:28","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-strongswan-ipsec-privodyashhaya-k-udalyonnomu-vypolneniyu-koda"},"modified":"2023-11-23T15:10:28","modified_gmt":"2023-11-23T13:10:28","slug":"uyazvimost-v-strongswan-ipsec-privodyashhaya-k-udalyonnomu-vypolneniyu-koda","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/uyazvimost-v-strongswan-ipsec-privodyashhaya-k-udalyonnomu-vypolneniyu-koda","title":{"rendered":"Zranitelnost v strongSwan IPsec, kter\u00e1 vede k vzd\u00e1len\u00e9mu spu\u0161t\u011bn\u00ed k\u00f3du","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Ve strongSwan, VPN bal\u00ed\u010dku zalo\u017een\u00e9m na protokolu IPSec, kter\u00fd se pou\u017e\u00edv\u00e1 v syst\u00e9mech Linux, Android, FreeBSD a macOS, byla zji\u0161t\u011bna zranitelnost (CVE-2023-41913), kterou lze vyu\u017e\u00edt k vzd\u00e1len\u00e9mu vykon\u00e1n\u00ed k\u00f3du \u00fato\u010dn\u00edka. Zranitelnost je zp\u016fsobena chybou v procesu charon-tkm p\u0159i realizaci protokolu v\u00fdm\u011bny kl\u00ed\u010d\u016f (IKE) zalo\u017een\u00e9ho na TKMv2 (Trusted Key Manager), co\u017e vede k p\u0159ete\u010den\u00ed z\u00e1sobn\u00edku p\u0159i zpracov\u00e1n\u00ed speci\u00e1ln\u011b form\u00e1tovan\u00fdch hodnot sch\u00e9matu DH (Diffie\u2013Hellman). Zranitelnost se projevuje pouze v syst\u00e9mech, kter\u00e9 pou\u017e\u00edvaj\u00ed charon-tkm a v verz\u00edch strongSwan, po\u010d\u00ednaje 5.3.0. Probl\u00e9m byl vy\u0159e\u0161en v aktualizaci strongSwan 5.9.12. Pro opravu zranitelnosti ve v\u011btv\u00edch po\u010d\u00ednaje 5.3.x byly tak\u00e9 p\u0159ipraveny patche. <\/p>\n

Chyba je zp\u016fsobena absenc\u00ed kontroly velikosti ve\u0159ejn\u00fdch hodnot Diffie-Hellman p\u0159ed jejich kop\u00edrov\u00e1n\u00edm do bufferu pevn\u00e9 velikosti na z\u00e1sobn\u00edku. P\u0159ete\u010den\u00ed m\u016f\u017ee b\u00fdt iniciov\u00e1no zasl\u00e1n\u00edm speci\u00e1ln\u011b upraven\u00e9 zpr\u00e1vy IKE_SA_INIT, kter\u00e1 je zpracov\u00e1v\u00e1na bez autentizace. Ve star\u0161\u00edch verz\u00edch strongSwan byla kontrola velikosti prov\u00e1d\u011bna v zpracovateli KE payload (Key Exchange), ale ve verzi 5.3.0 byly p\u0159id\u00e1ny zm\u011bny, kter\u00e9 p\u0159esunuly kontrolu ve\u0159ejn\u00fdch hodnot na stranu zpracovatele protokolu DH (Diffie-Hellman) a p\u0159idaly standardn\u00ed funkce pro usnadn\u011bn\u00ed kontroly spr\u00e1vnosti zn\u00e1m\u00fdch skupin DH. P\u0159i nedopat\u0159en\u00ed byly nov\u00e9 kontroln\u00ed funkce zapomenuty p\u0159idat do procesu charon-tkm, kter\u00fd funguje jako proxy mezi procesem IKE a TKM (Trusted Key Manager), tak\u017ee v funkci memcpy() skon\u010dily neov\u011b\u0159en\u00e9 hodnoty, co\u017e umo\u017enilo zapsat do 512-bajtov\u00e9ho bufferu a\u017e 10000 bajt\u016f dat.
\n
Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\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\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\udd47Zranitelnost ve strongSwan IPsec vedouc\u00ed k vzd\u00e1len\u00e9mu spu\u0161t\u011bn\u00ed k\u00f3du | ProHoster","description":"Ve strongSwan, bal\u00ed\u010dku VPN zalo\u017een\u00e9m na protokolu IPSec pou\u017e\u00edvan\u00e9m v Linuxu, Androidu, FreeBSD a macOS, byla nalezena zranitelnost (CVE-2023-41913), kterou lze vyu\u017e\u00edt k vzd\u00e1len\u00e9mu spu\u0161t\u011bn\u00ed k\u00f3du \u00fato\u010dn\u00edka.","canonical_url":"https:\/\/prohoster.info\/cs\/blog\/news\/uyazvimost-v-strongswan-ipsec-privodyashhaya-k-udalyonnomu-vypolneniyu-koda","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"cs_CZ","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\/cs\/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\/cs\/wp-json\/wp\/v2\/posts\/111715","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/comments?post=111715"}],"version-history":[{"count":0,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/posts\/111715\/revisions"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/media?parent=111715"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/categories?post=111715"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/tags?post=111715"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}