{"id":115207,"date":"2024-04-21T02:30:03","date_gmt":"2024-04-21T00:30:03","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-glibc-ekspluatiruemaya-cherez-skripty-na-php"},"modified":"2024-04-21T02:30:03","modified_gmt":"2024-04-21T00:30:03","slug":"uyazvimost-v-glibc-ekspluatiruemaya-cherez-skripty-na-php","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sk\/blog\/news\/uyazvimost-v-glibc-ekspluatiruemaya-cherez-skripty-na-php","title":{"rendered":"Zranite\u013enos\u0165 v Glibc, zneu\u017e\u00edvan\u00e1 prostredn\u00edctvom PHP skriptov","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

V \u0161tandardnej C kni\u017enici Glibc bola objaven\u00e1 zranite\u013enos\u0165 (CVE-2024-2961), ktor\u00e1 vedie k prete\u010deniu bufferu pri konverzii \u0161peci\u00e1lne form\u00e1tovan\u00fdch re\u0165azcov v k\u00f3dovan\u00ed ISO-2022-CN-EXT pomocou funkcie iconv(). V\u00fdskumn\u00edk, ktor\u00fd na probl\u00e9m upozornil, pl\u00e1nuje 10. m\u00e1ja vyst\u00fapi\u0165 na konferencii OffensiveCon s predn\u00e1\u0161kou, v ktorej sa spom\u00edna mo\u017enos\u0165 zneu\u017eitia zranite\u013enosti prostredn\u00edctvom aplik\u00e1ci\u00ed v jazyku PHP. Ozn\u00e1men\u00e9, \u017ee probl\u00e9m sa dot\u00fdka celej ekosyst\u00e9my PHP a niektor\u00fdch aplik\u00e1ci\u00ed. <\/p>\n

Pri konverzii re\u0165azcov do k\u00f3dovania UCS4, v s\u00falade s po\u017eiadavkami RFC 1922, kni\u017enica prid\u00e1va niektor\u00e9 escape symboly, ktor\u00e9 vyzna\u010duj\u00fa \u010dasti re\u0165azca, kde bolo k\u00f3dovanie zmenen\u00e9. Zranite\u013enos\u0165 je sp\u00f4soben\u00e1 nespr\u00e1vnou kontrolou hran\u00edc vn\u00fatorn\u00fdch buffrov funkciou iconv(), \u010do m\u00f4\u017ee vies\u0165 k prete\u010deniu buffra maxim\u00e1lne o 4 bajty. Pri prete\u010den\u00ed mimo buffra m\u00f4\u017eu by\u0165 zap\u00edsan\u00e9 ur\u010dit\u00e9 pevne stanoven\u00e9 hodnoty, ako napr\u00edklad '$+I', '$+J', '$+K', '$+L', '$+M' a '$*H'. Hoci sa zd\u00e1, \u017ee zneu\u017eitie tejto zranite\u013enosti na vykonanie k\u00f3du je nepravdepodobn\u00e9, pod\u013ea tvrdenia v\u00fdskumn\u00edka, ktor\u00fd probl\u00e9m odhalil, to bolo dostato\u010dn\u00e9 na pr\u00edpravu nieko\u013ek\u00fdch prototypov exploitov na vzdialen\u00fd \u00fatok na PHP aplik\u00e1cie, \u010do vedie k vykonaniu k\u00f3du. <\/p>\n

Zranite\u013enos\u0165 sa prejavuje od roku 2000 a bola odstr\u00e1nen\u00e1 v s\u00fa\u010dasne vyv\u00edjanej vetve Glibc 2.40. Oprava je tie\u017e dostupn\u00e1 vo forme patchov pre verzie Glibc od 2.32 do 2.39. V distrib\u00faci\u00e1ch je mo\u017en\u00e9 sledova\u0165 opravu zranite\u013enosti na str\u00e1nkach: Debian, Ubuntu, Gentoo, RHEL, SUSE, Fedora, Arch.
\n
Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 \u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442\u043d\u043e\u0439 \u0421\u0438-\u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0435 Glibc \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2024-2961), \u043f\u0440\u0438\u0432\u043e\u0434\u044f\u0449\u0430\u044f \u043a \u043f\u0435\u0440\u0435\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044e \u0431\u0443\u0444\u0435\u0440\u0430 \u043f\u0440\u0438 \u043f\u0440\u0435\u043e\u0431\u0440\u0430\u0437\u043e\u0432\u0430\u043d\u0438\u0438 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043e\u0444\u043e\u0440\u043c\u043b\u0435\u043d\u043d\u044b\u0445 \u0441\u0442\u0440\u043e\u043a \u0432 \u043a\u043e\u0434\u0438\u0440\u043e\u0432\u043a\u0435 ISO-2022-CN-EXT \u0444\u0443\u043d\u043a\u0446\u0438\u0435\u0439 iconv(). \u0412\u044b\u044f\u0432\u0438\u0432\u0448\u0438\u0439 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0443 \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044c \u043f\u043b\u0430\u043d\u0438\u0440\u0443\u0435\u0442 10 \u043c\u0430\u044f \u0432\u044b\u0441\u0442\u0443\u043f\u0438\u0442\u044c \u043d\u0430 \u043a\u043e\u043d\u0444\u0435\u0440\u0435\u043d\u0446\u0438\u0438 OffensiveCon \u0441 \u0434\u043e\u043a\u043b\u0430\u0434\u043e\u043c, \u0432 \u0430\u043d\u043e\u043d\u0441\u0435 \u043a\u043e\u0442\u043e\u0440\u043e\u0433\u043e \u0443\u043f\u043e\u043c\u0438\u043d\u0430\u0435\u0442\u0441\u044f \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u0447\u0435\u0440\u0435\u0437 \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u044f \u043d\u0430 \u044f\u0437\u044b\u043a\u0435 PHP. \u0417\u0430\u044f\u0432\u043b\u0435\u043d\u043e, \u0447\u0442\u043e \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0437\u0430\u0442\u0440\u0430\u0433\u0438\u0432\u0430\u0435\u0442 \u0432\u0441\u044e \u044d\u043a\u043e\u0441\u0438\u0441\u0442\u0435\u043c\u0443 PHP \u0438 \u043d\u0435\u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u044f. 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