{"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\/ro\/blog\/news\/uyazvimost-v-setevyh-bibliotekah-yazykov-rust-i-go-pozvolyayushhaya-obojti-proverku-ip-adresov","title":{"rendered":"O vulnerabilitate \u00een bibliotecile de re\u021bea ale limbajelor Rust \u0219i Go care permite ocolirea verific\u0103rii adreselor IP","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Bibliotecile standard ale limbajelor Rust \u0219i Go au identificat vulnerabilit\u0103\u021bi legate de procesarea incorect\u0103 a adreselor IP cu cifre octale \u00een func\u021biile de analiz\u0103 a adreselor. Aceste vulnerabilit\u0103\u021bi permit ocolirea verific\u0103rilor adreselor permise \u00een aplica\u021bii, de exemplu, pentru a face apeluri c\u0103tre adresele interfe\u021bei loopback (127.x.x.x) sau subre\u021belele intranet \u00een timpul atacurilor SSRF (Server-side request forgery). Vulnerabilit\u0103\u021bile continu\u0103 un ciclu de probleme anterior identificate \u00een bibliotecile 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) \u0219i Net::Netmask (Perl, CVE-2021-29424). <\/p>\n

Conform specifica\u021biei, valorile string adreselor IP<\/a>, \u00eencep\u00e2nd cu zero, ar trebui interpretate ca numere octale, dar multe biblioteci nu \u021bin cont de aceast\u0103 specificitate \u0219i pur \u0219i simplu elimin\u0103 zero, trat\u00e2nd valoarea ca un num\u0103r zecimal. De exemplu, num\u0103rul 0177 \u00een sistemul octal este egal cu 127 \u00een sistemul zecimal. Un atacator poate solicita un resurs, specific\u00e2nd valoarea «0177.0.0.1», care \u00een reprezentarea zecimal\u0103 corespunde «127.0.0.1». \u00cen cazul utiliz\u0103rii unei biblioteci problematice, aplica\u021bia nu va determina includerea adresei 0177.0.0.1 \u00een subnetul 127.0.0.1\/8, dar, de fapt, la trimiterea cererii poate efectua o accesare a adresei «0177.0.0.1», pe care func\u021biile de re\u021bea o vor trata ca 127.0.0.1. \u00cen mod similar, se poate \u00een\u0219ela \u0219i verificarea accesului la adresele intranet, specific\u00e2nd valori de genul «012.0.0.1» (echivalent «10.0.0.1»). <\/p>\n

\u00cen Rust, problema a afectat biblioteca standard «std::net» (CVE-2021-29922). Parserul de adrese IP din aceast\u0103 bibliotec\u0103 elimina zero-ul din fa\u021ba valorilor din adres\u0103, dar doar dac\u0103 erau specificate nu mai mult de trei cifre, de exemplu, «0177.0.0.1» va fi perceput ca o valoare invalid\u0103, iar \u00een r\u0103spuns la 010.8.8.8 \u0219i 127.0.026.1 va fi returnat un rezultat gre\u0219it. Aplica\u021biile care utilizeaz\u0103 std::net::IpAddr pentru a analiza adresele specificate de utilizator sunt poten\u021bial vulnerabile la atacuri SSRF (Server-side request forgery), RFI (Remote File Inclusion) \u0219i LFI (Local File Inclusion). Vulnerabilitatea a fost remediat\u0103 \u00een ramura Rust 1.53.0.

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

\u00cen limbajul Go, problema a afectat biblioteca standard «net» (CVE-2021-29923). Func\u021bia \u00eencorporat\u0103 net.ParseCIDR ignor\u0103 zero-urile din fa\u021ba numerelor octale, \u00een loc s\u0103 le proceseze. De exemplu, un atacator poate transmite valoarea 00000177.0.0.1, care la verificare \u00een func\u021bia net.ParseCIDR(00000177.0.0.1\/24) va fi analizat\u0103 ca 177.0.0.1\/24, \u0219i nu 127.0.0.1\/24. Problema se manifest\u0103 de asemenea \u00een platforma Kubernetes. Vulnerabilitatea a fost remediat\u0103 \u00een versiunea Go 1.16.3 \u0219i beta 1.17.

\"O<\/center>
\r\n \"Reda\u021bi\r\n
<\/div>\r\n <\/div><\/center>
\n
Sursa: opennet.ro<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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