{"id":100945,"date":"2021-08-08T16:22:46","date_gmt":"2021-08-08T14:22:47","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-setevyh-bibliotekah-yazykov-rust-i-go-pozvolyayushhaya-obojti-proverku-ip-adresov"},"modified":"2021-08-08T16:22:46","modified_gmt":"2021-08-08T14:22:47","slug":"uyazvimost-v-setevyh-bibliotekah-yazykov-rust-i-go-pozvolyayushhaya-obojti-proverku-ip-adresov","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/uyazvimost-v-setevyh-bibliotekah-yazykov-rust-i-go-pozvolyayushhaya-obojti-proverku-ip-adresov","title":{"rendered":"Zranitelnost v s\u00ed\u0165ov\u00fdch knihovn\u00e1ch jazyk\u016f Rust a Go, kter\u00e1 umo\u017e\u0148uje obej\u00edt kontrolu IP adres.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Ve standardn\u00edch knihovn\u00e1ch jazyk\u016f Rust a Go byly odhaleny zranitelnosti souvisej\u00edc\u00ed s nespr\u00e1vn\u00fdm zpracov\u00e1n\u00edm IP adres obsahuj\u00edc\u00edch osmi\u010dkov\u00e1 \u010d\u00edsla v funkc\u00edch pro anal\u00fdzu adres. Tyto zranitelnosti umo\u017e\u0148uj\u00ed obej\u00edt kontroly platn\u00fdch adres v aplikac\u00edch, nap\u0159\u00edklad pro p\u0159\u00edstup k adres\u00e1m smy\u010dkov\u00e9ho rozhran\u00ed (127.x.x.x) nebo intranetov\u00fdm pods\u00edt\u00edm p\u0159i prov\u00e1d\u011bn\u00ed \u00fatok\u016f SSRF (Server-side request forgery). Zranitelnosti dopl\u0148uj\u00ed cyklus probl\u00e9m\u016f d\u0159\u00edve identifikovan\u00fdch v knihovn\u00e1ch node-netmask (JavaScript, CVE-2021-28918, CVE-2021-29418), private-ip (JavaScript, CVE-2020-28360), ipaddress (Python, CVE-2021-29921), Data::Validate::IP (Perl, CVE-2021-29662) a Net::Netmask (Perl, CVE-2021-29424). <\/p>\n

Podle specifikace by m\u011bla b\u00fdt \u0159et\u011bzcov\u00e1 hodnota IP adress<\/a>, za\u010d\u00ednaj\u00edc\u00ed nulou, by m\u011bla b\u00fdt interpretov\u00e1na jako osmi\u010dkov\u00e1 \u010d\u00edsla, ale mnoho knihoven tuto zvl\u00e1\u0161tnost nezohled\u0148uje a jednodu\u0161e nulu ignoruje, p\u0159i\u010dem\u017e hodnotu zpracov\u00e1v\u00e1 jako desetinn\u00e9 \u010d\u00edslo. Nap\u0159\u00edklad \u010d\u00edslo 0177 v osmi\u010dkov\u00e9 soustav\u011b odpov\u00edd\u00e1 127 v desetinn\u00e9. \u00dato\u010dn\u00edk m\u016f\u017ee po\u017e\u00e1dat o zdroj, uveden\u00edm hodnoty «0177.0.0.1», kter\u00e1 v desetinn\u00e9m zobrazen\u00ed odpov\u00edd\u00e1 «127.0.0.1». V p\u0159\u00edpad\u011b pou\u017eit\u00ed problematick\u00e9 knihovny aplikace neidentifikuje v\u00fdskyt adresy 0177.0.0.1 v pods\u00edti 127.0.0.1\/8, ale ve skute\u010dnosti p\u0159i odesl\u00e1n\u00ed po\u017eadavku m\u016f\u017ee prov\u00e9st vol\u00e1n\u00ed na adresu «0177.0.0.1», kterou s\u00ed\u0165ov\u00e9 funkce zpracuj\u00ed jako 127.0.0.1. Podobn\u00fdm zp\u016fsobem lze oklamat i kontrolu p\u0159\u00edstupu k intranetov\u00fdm adres\u00e1m, uveden\u00edm hodnot podobn\u00fdch «012.0.0.1» (ekvivalent «10.0.0.1»). <\/p>\n

V Rustu byla standardn\u00ed knihovna «std::net» (CVE-2021-29922) n\u00e1chyln\u00e1 k probl\u00e9mu. Parser IP adres t\u00e9to knihovny ignoroval nulu p\u0159ed hodnotami v adrese, ale pouze pokud bylo uvedeno maxim\u00e1ln\u011b t\u0159i \u010d\u00edsla, nap\u0159\u00edklad «0177.0.0.1» bude pova\u017eov\u00e1no za neplatnou hodnotu, zat\u00edmco v reakci na 010.8.8.8 a 127.0.026.1 bude vr\u00e1cen nespr\u00e1vn\u00fd v\u00fdsledek. Aplikace pou\u017e\u00edvaj\u00edc\u00ed std::net::IpAddr p\u0159i anal\u00fdze u\u017eivatelsky zadan\u00fdch adres jsou potenci\u00e1ln\u011b n\u00e1chyln\u00e9 k \u00fatok\u016fm SSRF (Server-side request forgery), RFI (Remote File Inclusion) a LFI (Local File Inclusion). Zranitelnost byla odstran\u011bna ve verzi Rust 1.53.0.

\"Zranitelnost<\/center> <\/p>\n

V jazyce Go byla standardn\u00ed knihovna «net» (CVE-2021-29923) n\u00e1chyln\u00e1 k probl\u00e9mu. Vlo\u017een\u00e1 funkce net.ParseCIDR ignoruje nuly p\u0159ed osmi\u010dkov\u00fdmi \u010d\u00edsly, m\u00edsto aby je zpracovala. Nap\u0159\u00edklad, \u00fato\u010dn\u00edk m\u016f\u017ee p\u0159edat hodnotu 00000177.0.0.1, kter\u00e1 p\u0159i kontrole ve funkci net.ParseCIDR(00000177.0.0.1\/24) bude rozpozn\u00e1na jako 177.0.0.1\/24, a ne jako 127.0.0.1\/24. Probl\u00e9m se tak\u00e9 projevuje na platform\u011b Kubernetes. Zranitelnost byla odstran\u011bna ve verzi Go 1.16.3 a beta verzi 1.17.

\"Zranitelnost<\/center>
\r\n \"P\u0159ehr\u00e1t\r\n
<\/div>\r\n <\/div><\/center>
\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\u044b\u0445 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0430\u0445 \u044f\u0437\u044b\u043a\u043e\u0432 Rust \u0438 Go \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u044b \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438, \u0441\u0432\u044f\u0437\u0430\u043d\u043d\u044b\u0435 \u0441 \u043d\u0435\u043a\u043e\u0440\u0440\u0435\u043a\u0442\u043d\u043e\u0439 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u043e\u0439 IP-\u0430\u0434\u0440\u0435\u0441\u043e\u0432 \u0441 \u0432\u043e\u0441\u044c\u043c\u0438\u0440\u0438\u0447\u043d\u044b\u043c\u0438 \u0446\u0438\u0444\u0440\u0430\u043c\u0438 \u0432 \u0444\u0443\u043d\u043a\u0446\u0438\u044f\u0445 \u0440\u0430\u0437\u0431\u043e\u0440\u0430 \u0430\u0434\u0440\u0435\u0441\u0430. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0442 \u043e\u0431\u043e\u0439\u0442\u0438 \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0438 \u0434\u043e\u043f\u0443\u0441\u0442\u0438\u043c\u044b\u0445 \u0430\u0434\u0440\u0435\u0441\u043e\u0432 \u0432 \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u044f\u0445, \u043d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, \u0434\u043b\u044f \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u0430\u0446\u0438\u0438 \u043e\u0431\u0440\u0430\u0449\u0435\u043d\u0438\u044f \u043a \u0430\u0434\u0440\u0435\u0441\u0430\u043c loopback-\u0438\u043d\u0442\u0435\u0440\u0444\u0435\u0439\u0441\u0430 (127.x.x.x) \u0438\u043b\u0438 \u0438\u043d\u0442\u0440\u0430\u043d\u0435\u0442-\u043f\u043e\u0434\u0441\u0435\u0442\u044f\u043c \u043f\u0440\u0438 \u0441\u043e\u0432\u0435\u0440\u0448\u0435\u043d\u0438\u0438 \u0430\u0442\u0430\u043a SSRF (Server-side request forgery). \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u043f\u0440\u043e\u0434\u043e\u043b\u0436\u0430\u044e\u0442 \u0446\u0438\u043a\u043b \u043f\u0440\u043e\u0431\u043b\u0435\u043c, \u0440\u0430\u043d\u0435\u0435 \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u043d\u044b\u0445 \u0432 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0430\u0445 node-netmask […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":100946,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-100945","post","type-post","status-publish","format-standard","has-post-thumbnail","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 v s\u00ed\u0165ov\u00fdch knihovn\u00e1ch jazyk\u016f Rust a Go, kter\u00e1 umo\u017e\u0148uje obch\u00e1zet kontrolu IP adres | ProHoster","description":"Ve standardn\u00edch knihovn\u00e1ch jazyk\u016f Rust 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