{"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\/sk\/blog\/news\/uyazvimost-v-setevyh-bibliotekah-yazykov-rust-i-go-pozvolyayushhaya-obojti-proverku-ip-adresov","title":{"rendered":"Zranite\u013enos\u0165 v sie\u0165ov\u00fdch kni\u017eniciach jazykov Rust a Go, ktor\u00e1 umo\u017e\u0148uje ob\u00eds\u0165 kontrolu IP adries.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

V \u0161tandardn\u00fdch knihovn\u00e1ch jazykov Rust a Go boli zisten\u00e9 zranite\u013enosti s\u00favisiace s nespr\u00e1vnym spracovan\u00edm IP adries s osmi\u010dkov\u00fdmi \u010d\u00edslicami vo funkci\u00e1ch na anal\u00fdzu adries. Zranite\u013enosti umo\u017e\u0148uj\u00fa ob\u00eds\u0165 kontroly platn\u00fdch adries v aplik\u00e1ci\u00e1ch, napr\u00edklad pri pr\u00edstupe k adres\u00e1m loopback rozhrania (127.x.x.x) alebo intranetov\u00fdm podsietiam pri \u00fatokoch SSRF (Server-side request forgery). Zranite\u013enosti pokra\u010duj\u00fa v cykle probl\u00e9mov, ktor\u00e9 boli predt\u00fdm zisten\u00e9 v kni\u017eniciach 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

Pod\u013ea \u0161pecifik\u00e1cie by sa re\u0165azcov\u00e9 hodnoty IP adresy<\/a>, za\u010d\u00ednaj\u00face nulou, by sa mali interpretova\u0165 ako osmi\u010dkov\u00e9 \u010d\u00edsla, ale mnoh\u00e9 kni\u017enice t\u00fato \u0161pecifickos\u0165 nezoh\u013ead\u0148uj\u00fa a jednoducho zamietaj\u00fa nulu, spracov\u00e1vaj\u00fac hodnotu ako desatinn\u00e9 \u010d\u00edslo. Napr\u00edklad \u010d\u00edslo 0177 v osmi\u010dkovej s\u00fastave je rovn\u00e9 127 v desiatkovej. \u00dato\u010dn\u00edk m\u00f4\u017ee po\u017eiada\u0165 o zdroj, pri\u010dom uvedie hodnotu «0177.0.0.1», ktor\u00e1 v desiatkovom vyjadren\u00ed zodpoved\u00e1 «127.0.0.1». V pr\u00edpade pou\u017eitia probl\u00e9movej kni\u017enice aplik\u00e1cia neur\u010d\u00ed, \u010di adresa 0177.0.0.1 patr\u00ed do podsiete 127.0.0.1\/8, ale v skuto\u010dnosti m\u00f4\u017ee pri zasielan\u00ed po\u017eiadavky vykona\u0165 pr\u00edstup k adrese «0177.0.0.1», ktor\u00fa sie\u0165ov\u00e9 funkcie spracuj\u00fa ako 127.0.0.1. Podobn\u00fdm sp\u00f4sobom je mo\u017en\u00e9 oklama\u0165 aj kontrolu pr\u00edstupu k intranetov\u00fdm adres\u00e1m, ak uvediete hodnoty ako «012.0.0.1» (ekvivalent «10.0.0.1»). <\/p>\n

V jazyku Rust bola t\u00e1to probl\u00e9mov\u00e1 situ\u00e1cia vo \u0161tandardnej kni\u017enici «std::net» (CVE-2021-29922). Parser IP adries tejto kni\u017enice zamie\u0148a nulu pred hodnotami v adrese, ale iba ak sa uv\u00e1dza nie viac ako tri \u010d\u00edslice, napr\u00edklad «0177.0.0.1» bude pova\u017eovan\u00e9 za neplatn\u00fa hodnotu, zatia\u013e \u010do na 010.8.8.8 a 127.0.026.1 sa vr\u00e1ti nespr\u00e1vny v\u00fdsledok. Aplik\u00e1cie, ktor\u00e9 pou\u017e\u00edvaj\u00fa std::net::IpAddr pri parsovan\u00ed zadan\u00fdch pou\u017e\u00edvate\u013esk\u00fdch adries, s\u00fa potenci\u00e1lne vystaven\u00e9 \u00fatokom SSRF (Server-side request forgery), RFI (Remote File Inclusion) a LFI (Local File Inclusion). Zranite\u013enos\u0165 bola odstr\u00e1nen\u00e1 v verzii Rust 1.53.0.

\"Zranite\u013enos\u0165<\/center> <\/p>\n

V jazyku Go bola t\u00e1to probl\u00e9mov\u00e1 situ\u00e1cia v \u0161tandardnej kni\u017enici «net» (CVE-2021-29923). Vstavan\u00e1 funkcia net.ParseCIDR preskakuje nuly pred osmi\u010dkov\u00fdmi \u010d\u00edslami, namiesto ich spracovania. Napr\u00edklad \u00fato\u010dn\u00edk m\u00f4\u017ee zasla\u0165 hodnotu 00000177.0.0.1, ktor\u00e1 pri kontrole vo funkcii net.ParseCIDR(00000177.0.0.1\/24) bude interpretovan\u00e1 ako 177.0.0.1\/24, a nie 127.0.0.1\/24. Probl\u00e9m sa takisto prejavuje na platforme Kubernetes. Zranite\u013enos\u0165 bola odstr\u00e1nen\u00e1 vo verzii Go 1.16.3 a beta verzii 1.17.

\"Zranite\u013enos\u0165<\/center>
\r\n \"Prehrajte\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 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