{"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\/sv\/blog\/news\/uyazvimost-v-setevyh-bibliotekah-yazykov-rust-i-go-pozvolyayushhaya-obojti-proverku-ip-adresov","title":{"rendered":"S\u00e5rbarhet i n\u00e4tverksbiblioteken f\u00f6r spr\u00e5ken Rust och Go som m\u00f6jligg\u00f6r omg\u00e5else av IP-adresskontroll","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

I de standardbiblioteken f\u00f6r Rust- och Go-spr\u00e5ken har s\u00e5rbarheter identifierats som r\u00f6r felaktig hantering av IP-adresser med oktala siffror i adresseringsfunktioner. S\u00e5rbarheterna m\u00f6jligg\u00f6r omg\u00e5else av kontroller av giltiga adresser i applikationer, exempelvis f\u00f6r att f\u00e5 \u00e5tkomst till loopback-adresser (127.x.x.x) eller intran\u00e4t-subn\u00e4t vid SSRF-attacker (Server-side request forgery). S\u00e5rbarheterna forts\u00e4tter den cykel av problem som tidigare identifierats i biblioteken 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) och Net::Netmask (Perl, CVE-2021-29424). <\/p>\n

I enlighet med specifikationen ska str\u00e4ngv\u00e4rden IP-adresser<\/a>, som b\u00f6rjar med noll, b\u00f6r tolkas som oktala tal, men m\u00e5nga bibliotek tar inte h\u00e4nsyn till denna egenskap och sl\u00e4nger helt enkelt bort nollan, och behandlar v\u00e4rdet som ett decimalt tal. Till exempel \u00e4r talet 0177 i oktalsystemet lika med 127 i decimalt. En angripare kan beg\u00e4ra resursen genom att ange v\u00e4rdet «0177.0.0.1», vilket i decimalrepresentation motsvarar «127.0.0.1». I h\u00e4ndelse av en problematisk bibliotek, kommer applikationen inte att identifiera intr\u00e4det av adressen 0177.0.0.1 i n\u00e4tverket 127.0.0.1\/8, men faktiskt, n\u00e4r en beg\u00e4ran skickas kan den \u00e5stadkomma en ans\u00f6kan om adressen «0177.0.0.1», som n\u00e4tverksfunktioner kommer att behandla som 127.0.0.1. P\u00e5 liknande s\u00e4tt kan man lura kontrollen av infrastrukturadresser genom att ange v\u00e4rden som «012.0.0.1» (motsvarar «10.0.0.1»). <\/p>\n

I Rust var problemet kopplat till standardbiblioteket «std::net» (CVE-2021-29922). IP-adressparsen i detta bibliotek sl\u00e4ppte nollan f\u00f6re v\u00e4rdena i adressen, men endast om det angavs h\u00f6gst tre siffror, till exempel, «0177.0.0.1» kommer att uppfattas som ett ogiltigt v\u00e4rde, och som svar p\u00e5 010.8.8.8 och 127.0.026.1 kommer ett felaktigt resultat att returneras. Applikationer som anv\u00e4nder std::net::IpAddr vid analys av angivna adresser av anv\u00e4ndare \u00e4r potentiellt s\u00e5rbara f\u00f6r SSRF (Server-side request forgery), RFI (Remote File Inclusion) och LFI (Local File Inclusion). S\u00e5rbarheten har \u00e5tg\u00e4rdats i Rust-version 1.53.0.

\"S\u00e5rbarhet<\/center> <\/p>\n

I Go \u00e4r problemet kopplat till standardbiblioteket «net» (CVE-2021-29923). Den inbyggda funktionen net.ParseCIDR missar nollor f\u00f6re oktala tal, ist\u00e4llet f\u00f6r att bearbeta dem. Till exempel kan en angripare \u00f6verf\u00f6ra v\u00e4rdet 00000177.0.0.1, vilket vid kontroll i funktionen net.ParseCIDR(00000177.0.0.1\/24) kommer att analyseras som 177.0.0.1\/24, inte 127.0.0.1\/24. Problemet visar sig ocks\u00e5 p\u00e5 Kubernetes-plattformen. S\u00e5rbarheten har \u00e5tg\u00e4rdats i Go-version 1.16.3 och beta-version 1.17.

\"S\u00e5rbarhet<\/center>
\r\n \"Spela\r\n
<\/div>\r\n <\/div><\/center>
\n
K\u00e4lla: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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\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\udd47S\u00e5rbarhet i n\u00e4tverksbiblioteken f\u00f6r spr\u00e5ken Rust och Go, vilket m\u00f6jligg\u00f6r att kringg\u00e5 IP-adresskontroller | ProHoster","description":"S\u00e5rbarheter kopplade till felaktig hantering av IP-adresser med oktala siffror i parse-funktioner har uppt\u00e4ckts i standardbibliotek f\u00f6r spr\u00e5ken Rust och Go.","canonical_url":"https:\/\/prohoster.info\/sv\/blog\/news\/uyazvimost-v-setevyh-bibliotekah-yazykov-rust-i-go-pozvolyayushhaya-obojti-proverku-ip-adresov","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"sv_SE","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 \u0441\u0435\u0442\u0435\u0432\u044b\u0445 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0430\u0445 \u044f\u0437\u044b\u043a\u043e\u0432 Rust 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