{"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\/da\/blog\/news\/uyazvimost-v-setevyh-bibliotekah-yazykov-rust-i-go-pozvolyayushhaya-obojti-proverku-ip-adresov","title":{"rendered":"S\u00e5rbarhed i netv\u00e6rksbibliotekerne i Rust og Go, der muligg\u00f8r omg\u00e5else af IP-adressekontroller","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

I standardbibliotekerne i Rust og Go er der opdaget s\u00e5rbarheder relateret til forkert behandling af IP-adresser med oktale cifre i adresseringsfunktionerne. S\u00e5rbarhederne muligg\u00f8r omg\u00e5else af kontrol af gyldige adresser i applikationer, for eksempel til at henvise til loopback-adresser (127.x.x.x) eller intranet-subnet ved SSRF (Server-side request forgery) angreb. S\u00e5rbarhederne forts\u00e6tter en r\u00e6kke problemer, der tidligere er blevet opdaget i bibliotekerne 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) og Net::Netmask (Perl, CVE-2021-29424). <\/p>\n

I henhold til specifikationen skal strengv\u00e6rdier IP-adresser<\/a>, der begynder med nul, skal fortolkes som oktale tal, men mange biblioteker tager ikke h\u00f8jde for denne egenskab og kasserer bare nul, hvilket g\u00f8r, at v\u00e6rdien behandles som et decimalt tal. For eksempel er tallet 0177 i oktalsystemet lig med 127 i decimal. En angriber kan anmode om en ressource ved at angive v\u00e6rdien «0177.0.0.1», som i decimalt format svarer til «127.0.0.1». Hvis der anvendes et problematisk bibliotek, kan applikationen ikke bestemme, om adressen 0177.0.0.1 er i subnettet 127.0.0.1\/8, men faktisk kan den, n\u00e5r anmodningen sendes, f\u00e5 adgang til adressen «0177.0.0.1», som netv\u00e6rksfunktionerne vil behandle som 127.0.0.1. P\u00e5 lignende m\u00e5de kan man narre kontrollen af intra-net adresser ved at angive v\u00e6rdier som «012.0.0.1» (\u00e6kvivalent til «10.0.0.1»). <\/p>\n

I Rust var problemet relateret til standardbiblioteket «std::net» (CVE-2021-29922). IP-adresseparseren i dette bibliotek kasserede null f\u00f8r v\u00e6rdier i adressen, men kun hvis der er angivet h\u00f8jst tre cifre; for eksempel vil «0177.0.0.1» blive opfattet som en ugyldig v\u00e6rdi, mens der vil blive returneret et forkert resultat for 010.8.8.8 og 127.0.026.1. Applikationer, der anvender std::net::IpAddr til at analysere brugerangivne adresser, er potentielt udsat for SSRF (Server-side request forgery), RFI (Remote File Inclusion) og LFI (Local File Inclusion) angreb. S\u00e5rbarheden er blevet udbedret i Rust version 1.53.0.

\"S\u00e5rbarhed<\/center> <\/p>\n

I Go er problemet relateret til standardbiblioteket «net» (CVE-2021-29923). Den indbyggede funktion net.ParseCIDR springer null over f\u00f8r oktale tal i stedet for at behandle dem. For eksempel kan en angriber videregive v\u00e6rdien 00000177.0.0.1, som ved kontrol i funktionen net.ParseCIDR(00000177.0.0.1\/24) vil blive analyseret som 177.0.0.1\/24 i stedet for 127.0.0.1\/24. Problemet optr\u00e6der ogs\u00e5 p\u00e5 Kubernetes platformen. S\u00e5rbarheden er blevet udbedret i Go version 1.16.3 og beta-version 1.17.

\"S\u00e5rbarhed<\/center>
\r\n \"Afspil\r\n
<\/div>\r\n <\/div><\/center>
\n
Kilde: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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