{"id":101233,"date":"2021-09-09T10:22:51","date_gmt":"2021-09-09T08:22:51","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-npm-privodyashhaya-k-perezapisi-fajlov-v-sisteme"},"modified":"2021-09-09T10:22:51","modified_gmt":"2021-09-09T08:22:51","slug":"uyazvimost-v-npm-privodyashhaya-k-perezapisi-fajlov-v-sisteme","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/uyazvimost-v-npm-privodyashhaya-k-perezapisi-fajlov-v-sisteme","title":{"rendered":"NPM sebezhet\u0151s\u00e9g, amely f\u00e1jlok fel\u00fcl\u00edr\u00e1s\u00e1hoz vezet a rendszerben","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

A GitHub bemutatta a tar csomagok \u00e9s az @npmcli\/arborist h\u00e9t s\u00e9r\u00fcl\u00e9kenys\u00e9g\u00e9nek r\u00e9szleteit, amelyek a tar arch\u00edvumok kezel\u00e9s\u00e9re \u00e9s a Node.js f\u00fcgg\u0151s\u00e9gi f\u00e1k sz\u00e1m\u00edt\u00e1s\u00e1ra szolg\u00e1l\u00f3 funkci\u00f3kat k\u00edn\u00e1lnak. A s\u00e9r\u00fcl\u00e9kenys\u00e9gek lehet\u0151v\u00e9 teszik, hogy a speci\u00e1lisan kialak\u00edtott arch\u00edvumok kicsomagol\u00e1sakor f\u00e1jlokat \u00edrjanak fel\u00fcl a gy\u00f6k\u00e9rk\u00f6nyvt\u00e1ron k\u00edv\u00fcl, amennyire az aktu\u00e1lis hozz\u00e1f\u00e9r\u00e9si jogok megengedik. A probl\u00e9m\u00e1k lehet\u0151v\u00e9 teszik tetsz\u0151leges k\u00f3d v\u00e9grehajt\u00e1s\u00e1t a rendszerben, p\u00e9ld\u00e1ul parancsok hozz\u00e1ad\u00e1s\u00e1val a ~\/ .bashrc vagy ~\/ .profile f\u00e1jlokhoz nem privilegiz\u00e1lt felhaszn\u00e1l\u00f3k \u00e1ltal v\u00e9grehajtott m\u0171veletek sor\u00e1n, vagy rendszerf\u00e1jlok cser\u00e9j\u00e9vel root joggal t\u00f6rt\u00e9n\u0151 ind\u00edt\u00e1skor. <\/p>\n

A sebezhet\u0151s\u00e9gek kock\u00e1zata fokoz\u00f3dik azzal, hogy a probl\u00e9m\u00e1s k\u00f3dot az npm csomagkezel\u0151 haszn\u00e1lja az npm csomagokkal v\u00e9gzett m\u0171veletek sor\u00e1n, lehet\u0151v\u00e9 t\u00e9ve a felhaszn\u00e1l\u00f3k elleni t\u00e1mad\u00e1st, ha egy speci\u00e1lisan kialak\u00edtott npm csomagot helyeznek el a t\u00e1rol\u00f3ban, amelynek feldolgoz\u00e1sakor a rendszer hajtja v\u00e9gre a t\u00e1mad\u00f3 k\u00f3dj\u00e1t. A t\u00e1mad\u00e1s akkor is lehets\u00e9ges, ha a csomagokat az «—ignore-scripts» m\u00f3dban telep\u00edtik, amely letiltja a be\u00e9p\u00edtett szkriptek futtat\u00e1s\u00e1t. Az npm \u00f6sszesen n\u00e9gy sebezhet\u0151s\u00e9get \u00e9rint (CVE-2021-32804, CVE-2021-37713, CVE-2021-39134 \u00e9s CVE-2021-39135) a h\u00e9tb\u0151l. Az els\u0151 k\u00e9t probl\u00e9ma a tar csomagra vonatkozik, m\u00edg a m\u00e1sik kett\u0151 a @npmcli\/arborist csomagra. <\/p>\n

A legvesz\u00e9lyesebb sebezhet\u0151s\u00e9g, a CVE-2021-32804, abb\u00f3l ad\u00f3dik, hogy a tar arch\u00edvumban megadott abszol\u00fat \u00fatvonalak t\u00f6rl\u00e9sekor a megism\u00e9tl\u0151d\u0151 «\uff0f» karakterek nem megfelel\u0151en ker\u00fclnek feldolgoz\u00e1sra \u2014 csak az els\u0151 karaktert t\u00e1vol\u00edtj\u00e1k el, m\u00edg a t\u00f6bbit meghagyj\u00e1k. P\u00e9ld\u00e1ul az «\uff0fhome\uff0fuser\uff0f.bashrc» \u00fatvonal «home\uff0fuser\uff0f.bashrc» form\u00e1ra alakul, m\u00edg az «\uff0f\uff0fhome\uff0fuser\uff0f.bashrc» \u00fatvonal «\uff0fhome\uff0fuser\uff0f.bashrc» form\u00e1ban jelenik meg. A m\u00e1sodik sebezhet\u0151s\u00e9g, a CVE-2021-37713, csak Windows platformon jelentkezik, \u00e9s a relat\u00edv \u00fatvonalak nem megfelel\u0151 tiszt\u00edt\u00e1s\u00e1val kapcsolatos, amelyek magukban foglalj\u00e1k az elv\u00e1laszt\u00f3 karakter n\u00e9lk\u00fcli lemeze jelz\u00e9st («C:some\path») \u00e9s a visszat\u00e9r\u00e9si szekvenci\u00e1t a kor\u00e1bbi k\u00f6nyvt\u00e1rba («C:..\uff0ffoo»). <\/p>\n

A CVE-2021-39134 \u00e9s CVE-2021-39135 sebezhet\u0151s\u00e9gek kifejezetten a @npmcli\/arborist modulra vonatkoznak. Az els\u0151 probl\u00e9ma csak olyan rendszerekben jelentkezik, amelyek nem tesznek k\u00fcl\u00f6nbs\u00e9get a nagy- \u00e9s kisbet\u0171k k\u00f6z\u00f6tt a f\u00e1jlrendszerben (macOS \u00e9s Windows), \u00e9s lehet\u0151v\u00e9 teszi f\u00e1jlok \u00edr\u00e1s\u00e1t a f\u00e1jlrendszer tetsz\u0151leges r\u00e9sz\u00e9be az\u00e1ltal, hogy k\u00e9t modult adunk meg a f\u00fcgg\u0151s\u00e9gek k\u00f6z\u00f6tt: ‘»foo»: «file:\uff0fsome\uff0fpath»‘ \u00e9s ‘FOO: «file:foo.tgz»‘, amelyek feldolgoz\u00e1sa a \/some\/path k\u00f6nyvt\u00e1r tartalm\u00e1nak t\u00f6rl\u00e9s\u00e9hez \u00e9s a foo.tgz tartalm\u00e1nak oda\u00edr\u00e1s\u00e1hoz vezet. A m\u00e1sodik probl\u00e9ma lehet\u0151v\u00e9 teszi f\u00e1jlok fel\u00fcl\u00edr\u00e1s\u00e1t szimbolikus linkek manipul\u00e1l\u00e1s\u00e1val. <\/p>\n

A sebezhet\u0151s\u00e9geket a Node.js 12.22.6 \u00e9s 14.17.6, npm CLI 6.14.15 \u00e9s 7.21.0, valamint a tar csomag 4.4.19, 5.0.11 \u00e9s 6.1.10 k\u00fcl\u00f6nb\u00f6z\u0151 verzi\u00f3iban orvosolt\u00e1k. A probl\u00e9m\u00e1kra vonatkoz\u00f3 inform\u00e1ci\u00f3k megszerz\u00e9se keret\u00e9ben a «bug bounty» kezdem\u00e9nyez\u00e9s r\u00e9v\u00e9n a GitHub 14500 doll\u00e1ros kifizet\u00e9st tett a kutat\u00f3knak, \u00e9s \u00e1tvizsg\u00e1lta a t\u00e1rol\u00f3 tartalm\u00e1t, ahol nem tal\u00e1ltak pr\u00f3b\u00e1lkoz\u00e1sokat a sebezhet\u0151s\u00e9gek kihaszn\u00e1l\u00e1s\u00e1ra. A megadott probl\u00e9m\u00e1k v\u00e9delme \u00e9rdek\u00e9ben a GitHub a szimbolikus linkeket, a kem\u00e9ny linkeket \u00e9s az abszol\u00fat \u00fatvonalakat tartalmaz\u00f3 NPM csomagok t\u00e1rol\u00f3ba val\u00f3 publik\u00e1l\u00e1s\u00e1t is megtiltotta.
\n
Forr\u00e1s: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u041a\u043e\u043c\u043f\u0430\u043d\u0438\u044f GitHub \u0440\u0430\u0441\u043a\u0440\u044b\u043b\u0430 \u043f\u043e\u0434\u0440\u043e\u0431\u043d\u043e\u0441\u0442\u0438 \u043e \u0441\u0435\u043c\u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044f\u0445 \u0432 \u043f\u0430\u043a\u0435\u0442\u0430\u0445 tar \u0438 @npmcli\/arborist, \u043f\u0440\u0435\u0434\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u044e\u0449\u0438\u0445 \u0444\u0443\u043d\u043a\u0446\u0438\u0438 \u0434\u043b\u044f \u0440\u0430\u0431\u043e\u0442\u044b \u0441 tar-\u0430\u0440\u0445\u0438\u0432\u0430\u043c\u0438 \u0438 \u0440\u0430\u0441\u0447\u0435\u0442\u0430 \u0434\u0435\u0440\u0435\u0432\u0430 \u0437\u0430\u0432\u0438\u0441\u0438\u043c\u043e\u0441\u0442\u0435\u0439 \u0432 Node.js. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0442 \u043f\u0440\u0438 \u0440\u0430\u0441\u043f\u0430\u043a\u043e\u0432\u043a\u0435 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