{"id":103040,"date":"2022-01-20T21:36:44","date_gmt":"2022-01-20T19:36:44","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/%d1%83%d1%8f%d0%b7%d0%b2%d0%b8%d0%bc%d0%be%d1%81%d1%82%d1%8c-%d0%b2-%d1%81%d1%82%d0%b0%d0%bd%d0%b4%d0%b0%d1%80%d1%82%d0%bd%d0%be%d0%b9-%d0%b1%d0%b8%d0%b1%d0%bb%d0%b8%d0%be%d1%82%d0%b5%d0%ba%d0%b5"},"modified":"2022-01-20T21:36:44","modified_gmt":"2022-01-20T19:36:44","slug":"%d1%83%d1%8f%d0%b7%d0%b2%d0%b8%d0%bc%d0%be%d1%81%d1%82%d1%8c-%d0%b2-%d1%81%d1%82%d0%b0%d0%bd%d0%b4%d0%b0%d1%80%d1%82%d0%bd%d0%be%d0%b9-%d0%b1%d0%b8%d0%b1%d0%bb%d0%b8%d0%be%d1%82%d0%b5%d0%ba%d0%b5","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/%d1%83%d1%8f%d0%b7%d0%b2%d0%b8%d0%bc%d0%be%d1%81%d1%82%d1%8c-%d0%b2-%d1%81%d1%82%d0%b0%d0%bd%d0%b4%d0%b0%d1%80%d1%82%d0%bd%d0%be%d0%b9-%d0%b1%d0%b8%d0%b1%d0%bb%d0%b8%d0%be%d1%82%d0%b5%d0%ba%d0%b5","title":{"rendered":"Sebezhet\u0151s\u00e9g a Rust programoz\u00e1si nyelv szabv\u00e1nyos k\u00f6nyvt\u00e1r\u00e1ban","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

A Rust nyelv alapk\u00f6nyvt\u00e1r\u00e1ban felfedeztek egy sebezhet\u0151s\u00e9get (CVE-2022-21658), amely versenyhelyzetb\u0151l ered a std::fs::remove_dir_all() f\u00fcggv\u00e9nyben. Ha ezt a f\u00fcggv\u00e9nyt egy privilegiz\u00e1lt alkalmaz\u00e1sban haszn\u00e1lj\u00e1k ideiglenes f\u00e1jlok t\u00f6rl\u00e9s\u00e9re, akkor a t\u00e1mad\u00f3 k\u00e9pes lehet tetsz\u0151leges rendszerf\u00e1jlok \u00e9s mapp\u00e1k t\u00f6rl\u00e9s\u00e9re, amelyekhez norm\u00e1lis k\u00f6r\u00fclm\u00e9nyek k\u00f6z\u00f6tt nincs hozz\u00e1f\u00e9r\u00e9se. <\/p>\n

A sebezhet\u0151s\u00e9g egy helytelen\u00fcl v\u00e9grehajtott szimbolikus hivatkoz\u00e1sok ellen\u0151rz\u00e9s\u00e9b\u0151l ad\u00f3dik a k\u00f6nyvt\u00e1rak rekurz\u00edv t\u00f6rl\u00e9se el\u0151tt. Ahelyett, hogy megtiltan\u00e1 a szimbolikus hivatkoz\u00e1sok k\u00f6vet\u00e9s\u00e9t, a remove_dir_all() f\u00fcggv\u00e9ny el\u0151sz\u00f6r ellen\u0151rzi, hogy a f\u00e1jl szimbolikus hivatkoz\u00e1s-e. Ha a hivatkoz\u00e1s meg van hat\u00e1rozva, akkor f\u00e1jlk\u00e9nt t\u00f6rlik, ha pedig k\u00f6nyvt\u00e1r \u2014 akkor a tartalom rekurz\u00edv t\u00f6rl\u00e9si m\u0171velete indul el. A probl\u00e9ma az, hogy az ellen\u0151rz\u00e9s \u00e9s a t\u00f6rl\u00e9si m\u0171velet megkezd\u00e9se k\u00f6z\u00f6tt van egy kis k\u00e9sleked\u00e9s. <\/p>\n

Abban a pillanatban, amikor az ellen\u0151rz\u00e9s m\u00e1r megt\u00f6rt\u00e9nt, de a k\u00f6nyvt\u00e1rak t\u00f6rl\u00e9s\u00e9re szolg\u00e1l\u00f3 m\u0171velet m\u00e9g nem kezd\u0151d\u00f6tt el, a t\u00e1mad\u00f3 kicser\u00e9lheti az ideiglenes f\u00e1jlokat tartalmaz\u00f3 k\u00f6nyvt\u00e1rat egy szimbolikus linkre. Ha a megfelel\u0151 id\u0151pontban t\u00f6rt\u00e9nik, a remove_dir_all() f\u00fcggv\u00e9ny \u00fagy dolgozza fel a szimbolikus linket, mint egy k\u00f6nyvt\u00e1rat, \u00e9s elind\u00edtja a t\u00f6rl\u00e9st, amelyre ez a link mutat. Annak ellen\u00e9re, hogy a t\u00e1mad\u00e1s sikere a k\u00f6nyvt\u00e1r cser\u00e9j\u00e9nek pontos id\u0151z\u00edt\u00e9s\u00e9t\u0151l f\u00fcgg, \u00e9s a megfelel\u0151 pillanatba val\u00f3 elhelyezked\u00e9s val\u00f3sz\u00edn\u0171s\u00e9ge alacsony, a kutat\u00f3k k\u00eds\u00e9rleteik sor\u00e1n sikeresen v\u00e9grehajtott\u00e1k a t\u00e1mad\u00e1st, miut\u00e1n a kihaszn\u00e1l\u00e1st n\u00e9h\u00e1ny m\u00e1sodpercen bel\u00fcl v\u00e9grehajtott\u00e1k. <\/p>\n

A sebezhet\u0151s\u00e9gek minden Rust verzi\u00f3t \u00e9rintenek az 1.0.0-t\u00f3l 1.58.0-ig bez\u00e1r\u00f3lag. A probl\u00e9ma jelenleg jav\u00edtva van egy jav\u00edt\u00e1ssal (a jav\u00edt\u00e1st a 1.58.1-es kiad\u00e1sba fogj\u00e1k beilleszteni, amely n\u00e9h\u00e1ny \u00f3r\u00e1n bel\u00fcl v\u00e1rhat\u00f3). A sebezhet\u0151s\u00e9g megsz\u00fcntet\u00e9s\u00e9t a disztrib\u00faci\u00f3s oldalak k\u00f6vethet\u0151k: Debian, RHEL, SUSE, Fedora, Ubuntu, Arch, FreeBSD. Minden, Rust nyelven k\u00e9sz\u00fclt program felhaszn\u00e1l\u00f3nak, amelyet emelt szint\u0171 jogosults\u00e1gokkal futtatnak \u00e9s haszn\u00e1lja a remove_dir_all f\u00fcggv\u00e9nyt, s\u00fcrg\u0151sen javasolt friss\u00edtenie a Rust-ot a 1.58.1-es verzi\u00f3ra. \u00c9rdekess\u00e9g, hogy a kiadott jav\u00edt\u00e1s nem oldja meg a probl\u00e9m\u00e1t minden rendszeren, p\u00e9ld\u00e1ul a REDOX oper\u00e1ci\u00f3s rendszeren \u00e9s a macOS 10.10 (Yosemite) alatti verzi\u00f3kban a sebezhet\u0151s\u00e9g nem blokkolhat\u00f3 az O_NOFOLLOW jelz\u0151 hi\u00e1nya miatt, amely megakad\u00e1lyozza a szimbolikus linkeken val\u00f3 k\u00f6vet\u00e9st.
\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\u043e\u0439 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0435 \u044f\u0437\u044b\u043a\u0430 Rust \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2022-21658), \u0441\u0432\u044f\u0437\u0430\u043d\u043d\u0430\u044f \u0441 \u0441\u043e\u0441\u0442\u043e\u044f\u043d\u0438\u0435\u043c \u0433\u043e\u043d\u043a\u0438 \u0432 \u0444\u0443\u043d\u043a\u0446\u0438\u0438 std::fs::remove_dir_all(). \u0412 \u0441\u043b\u0443\u0447\u0430\u0435 \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u044f \u0434\u0430\u043d\u043d\u043e\u0439 \u0444\u0443\u043d\u043a\u0446\u0438\u0438 \u0434\u043b\u044f \u0443\u0434\u0430\u043b\u0435\u043d\u0438\u044f \u0432\u0440\u0435\u043c\u0435\u043d\u043d\u044b\u0445 \u0444\u0430\u0439\u043b\u043e\u0432 \u0432 \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u043c 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\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\u0442\u0430\u043d\u0434\u0430\u0440\u0442\u043d\u043e\u0439 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0435 \u044f\u0437\u044b\u043a\u0430 Rust | ProHoster","og:description":"\u0412 \u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442\u043d\u043e\u0439 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0435 \u044f\u0437\u044b\u043a\u0430 Rust \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2022-21658), \u0441\u0432\u044f\u0437\u0430\u043d\u043d\u0430\u044f \u0441 \u0441\u043e\u0441\u0442\u043e\u044f\u043d\u0438\u0435\u043c \u0433\u043e\u043d\u043a\u0438 \u0432 \u0444\u0443\u043d\u043a\u0446\u0438\u0438 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