{"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\/hu\/blog\/news\/uyazvimost-v-setevyh-bibliotekah-yazykov-rust-i-go-pozvolyayushhaya-obojti-proverku-ip-adresov","title":{"rendered":"A vulnerability in the network libraries of Rust and Go languages, allowing the bypass of IP address verification","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

A Rust \u00e9s Go nyelvek standard k\u00f6nyvt\u00e1raiban olyan sebezhet\u0151s\u00e9geket tal\u00e1ltak, amelyek az IP-c\u00edmek nem megfelel\u0151 kezel\u00e9s\u00e9vel kapcsolatosak, amikor nyolcas sz\u00e1mjegyeket tartalmaznak az c\u00edmkib\u0151v\u00edt\u0151 funkci\u00f3kban. Ezek a sebezhet\u0151s\u00e9gek lehet\u0151v\u00e9 teszik a megengedett c\u00edmek ellen\u0151rz\u00e9s\u00e9nek megker\u00fcl\u00e9s\u00e9t az alkalmaz\u00e1sokban, p\u00e9ld\u00e1ul a loopback interf\u00e9sz (127.x.x.x) c\u00edmeinek vagy intranet alh\u00e1l\u00f3zatok hozz\u00e1f\u00e9r\u00e9s\u00e9nek megszerz\u00e9s\u00e9t SSRF (Server-side request forgery) t\u00e1mad\u00e1sok v\u00e9grehajt\u00e1sakor. Ezek a sebezhet\u0151s\u00e9gek folytatj\u00e1k a probl\u00e9m\u00e1k ciklus\u00e1t, amelyeket kor\u00e1bban a 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) \u00e9s Net::Netmask (Perl, CVE-2021-29424) k\u00f6nyvt\u00e1rakban azonos\u00edtottak. <\/p>\n

A specifik\u00e1ci\u00f3 szerint a null\u00e1val kezd\u0151d\u0151 karakterl\u00e1nc \u00e9rt\u00e9keket nyolcas sz\u00e1mk\u00e9nt kell \u00e9rtelmezni, de sok k\u00f6nyvt\u00e1r nem veszi figyelembe ezt a jellemz\u0151t \u00e9s egyszer\u0171en elt\u00e1vol\u00edtja a null\u00e1t, a sz\u00e1mot decim\u00e1lis sz\u00e1mk\u00e9nt kezelve. IP-c\u00edmek<\/a>, nulla kezd\u0151dnek, nyolcas sz\u00e1mrendszer\u0171 sz\u00e1mk\u00e9nt kell \u00e9rtelmezni, de sok k\u00f6nyvt\u00e1r nem veszi figyelembe ezt a saj\u00e1toss\u00e1got, \u00e9s egyszer\u0171en eldobja a null\u00e1t, a sz\u00e1m\u00e9rt\u00e9ket tizedes sz\u00e1mk\u00e9nt kezelve. P\u00e9ld\u00e1ul az 0177 sz\u00e1mnyolcas rendszerben 127-nek felel meg tizedes \u00e9rt\u00e9ken. A t\u00e1mad\u00f3 k\u00e9rheti az er\u0151forr\u00e1st az «0177.0.0.1» \u00e9rt\u00e9kkel, amely tizedes form\u00e1tumban «127.0.0.1»-nek felel meg. Ha probl\u00e9m\u00e1s k\u00f6nyvt\u00e1rat haszn\u00e1lnak, az alkalmaz\u00e1s nem fogja az 0177.0.0.1 c\u00edmet az 127.0.0.1\/8 alh\u00e1l\u00f3zatban azonos\u00edtani, de a k\u00e9r\u00e9s elk\u00fcld\u00e9sekor t\u00e9nylegesen el\u00e9rheti az «0177.0.0.1» c\u00edmet, amit a h\u00e1l\u00f3zati funkci\u00f3k 127.0.0.1-k\u00e9nt kezelnek. Hasonl\u00f3 m\u00f3don meg lehet csalni az intranetes c\u00edmek ellen\u0151rz\u00e9s\u00e9t is, ha olyan \u00e9rt\u00e9keket adnak meg, mint p\u00e9ld\u00e1ul «012.0.0.1» (amely a «10.0.0.1» ekvivalens). <\/p>\n

A Rust nyelvben a probl\u00e9m\u00e1t a «std::net» standard k\u00f6nyvt\u00e1r okozza (CVE-2021-29922). E k\u00f6nyvt\u00e1r IP-c\u00edm\u00e9nek elemz\u0151je eldobta a null\u00e1t a c\u00edm \u00e9rt\u00e9ke el\u0151tt, de csak akkor, ha nem t\u00f6bb mint h\u00e1rom sz\u00e1mjegyb\u0151l \u00e1llt, p\u00e9ld\u00e1ul az «0177.0.0.1» \u00e9rv\u00e9nytelen \u00e9rt\u00e9kk\u00e9nt fog szerepelni, m\u00edg a 010.8.8.8 \u00e9s 127.0.026.1 eset\u00e9ben helytelen eredm\u00e9ny lesz visszaadva. Azok az alkalmaz\u00e1sok, amelyek a std::net::IpAddr-t haszn\u00e1lj\u00e1k a felhaszn\u00e1l\u00f3 \u00e1ltal megadott c\u00edmek elemz\u00e9s\u00e9re, potenci\u00e1lisan SSRF (server-side request forgery), RFI (remote file inclusion) \u00e9s LFI (local file inclusion) t\u00e1mad\u00e1soknak vannak kit\u00e9ve. A s\u00e9r\u00fcl\u00e9kenys\u00e9get a Rust 1.53.0 \u00e1gban jav\u00edtott\u00e1k.

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

A Go nyelvben a «net» standard k\u00f6nyvt\u00e1r van kit\u00e9ve a probl\u00e9m\u00e1nak (CVE-2021-29923). A be\u00e9p\u00edtett net.ParseCIDR funkci\u00f3 eltolja a null\u00e1kat a nyolcas sz\u00e1mok el\u0151tt, a feldolgoz\u00e1s helyett. P\u00e9ld\u00e1ul a t\u00e1mad\u00f3 \u00e1tadhatja az 00000177.0.0.1 \u00e9rt\u00e9ket, amely a net.ParseCIDR(00000177.0.0.1\/24) f\u00fcggv\u00e9ny vizsg\u00e1lata sor\u00e1n 177.0.0.1\/24-k\u00e9nt ker\u00fcl feldolgoz\u00e1sra, nem pedig 127.0.0.1\/24-k\u00e9nt. A probl\u00e9ma a Kubernetes platformon is megnyilv\u00e1nul. A s\u00e9r\u00fcl\u00e9kenys\u00e9g a Go 1.16.3 \u00e9s 1.17 beta verzi\u00f3kban lett jav\u00edtva.

\"A<\/center>
\r\n \"Vide\u00f3\r\n
<\/div>\r\n <\/div><\/center>
\n
Forr\u00e1s: 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\udd47Sebezhet\u0151s\u00e9g a Rust \u00e9s Go nyelvek h\u00e1l\u00f3zati k\u00f6nyvt\u00e1raiban, amely lehet\u0151v\u00e9 teszi az IP-c\u00edmek ellen\u0151rz\u00e9s\u00e9nek megker\u00fcl\u00e9s\u00e9t | 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