{"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\/et\/blog\/news\/uyazvimost-v-glibc-ekspluatiruemaya-cherez-skripty-na-php","title":{"rendered":"Glibc haavatavus, mida saab \u00e4ra kasutada PHP skriptide kaudu","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Standardse C-teegi Glibc-s on avastatud haavatavus (CVE-2024-2961), mis p\u00f5hjustab puhver\u00fclevoolu, kui spetsiifiliste formaadiga ISO-2022-CN-EXT strings muudetakse funktsiooniga iconv(). Probleemi avastanud uurija kavatseb 10. mail esineda konverentsil OffensiveCon, kus ta mainib haavatavuse \u00e4rakasutamise v\u00f5imalust PHP-keeles kirjutatud rakenduste kaudu. Toodud probleem m\u00f5jutab kogu PHP \u00f6kos\u00fcsteemi ja m\u00f5ningaid rakendusi. <\/p>\n

UCS4-kodeerimisse ridade muutmisel, vastavalt RFC 1922 n\u00f5uetele, lisab teek m\u00f5ned escape-m\u00e4rgid, mis eristavad ridade osi, kus kodeering on muutunud. Haavatavus tuleneb funktsiooni iconv() vale sisendi piiri kontrollimisest, mis v\u00f5ib p\u00f5hjustada puhver\u00fclevoolu maksimaalselt 4 baitiga. Puhvri piiridest v\u00e4ljas v\u00f5ib kirjutada teatud fikseeritud v\u00e4\u00e4rtusi, nagu ‘$+I’, ‘$+J’, ‘$+K’, ‘$+L’, ‘$+M’ ja ‘$*H’. Kuigi sellise haavatavuse \u00e4rakasutamine koodi t\u00e4itmiseks tundub ebat\u00f5en\u00e4oline, on uurija v\u00e4itel olnud seda piisav, et valmistada ette mitmeid protot\u00fc\u00fcpe exploite PHP-rakendustele, mis viivad koodi t\u00e4itmiseni. <\/p>\n

Haavatavus on ilmnenud alates 2000. aastast ja on likvideeritud Glibc 2.40 arenduses oleval harul. Parandus on saadaval ka Glibc v\u00e4ljalasetele alates 2.32 kuni 2.39 valmis patchide kujul. Distrodes saab haavatavuse parandamisest j\u00e4lgida lehtedel: Debian, Ubuntu, Gentoo, RHEL, SUSE, Fedora, Arch.
\n
Allikas: 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. […]<\/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-115207","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\udd47Glibc haavatavus, mida saab \u00e4ra kasutada PHP skriptide kaudu | ProHoster","description":"Standardse C-teegi Glibc-s on avastatud haavatavus (CVE-2024-2961), mis p\u00f5hjustab puhver\u00fclevoolu, kui spetsiifiliste formaadiga ISO-2022-CN-EXT strings muudetakse funktsiooniga 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