{"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\/sk\/blog\/news\/uyazvimost-v-npm-privodyashhaya-k-perezapisi-fajlov-v-sisteme","title":{"rendered":"Zranite\u013enos\u0165 v NPM ved\u00faca k prep\u00edsaniu s\u00faborov v syst\u00e9me","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Spolo\u010dnos\u0165 GitHub zverejnila podrobnosti o siedmich zranite\u013enostiach v bal\u00edkoch tar a @npmcli\/arborist, ktor\u00e9 poskytuj\u00fa funkcie na pr\u00e1cu s tar arch\u00edvmi a na v\u00fdpo\u010det stromu z\u00e1vislost\u00ed v Node.js. Zranite\u013enosti umo\u017e\u0148uj\u00fa pri rozba\u013eovan\u00ed \u0161peci\u00e1lne upraven\u00e9ho arch\u00edvu prep\u00edsa\u0165 s\u00fabory mimo kore\u0148ov\u00e9ho adres\u00e1ra, do ktor\u00e9ho sa rozba\u013euje, v z\u00e1vislosti od aktu\u00e1lnych pr\u00edstupov\u00fdch pr\u00e1v. Probl\u00e9my poskytuj\u00fa mo\u017enos\u0165 vykona\u0165 \u013eubovo\u013en\u00fd k\u00f3d v syst\u00e9me, napr\u00edklad pridan\u00edm pr\u00edkazov do ~\/.bashrc alebo ~\/.profile pri vykon\u00e1van\u00ed oper\u00e1cie neprivilegovan\u00fdm pou\u017e\u00edvate\u013eom alebo nahraden\u00edm syst\u00e9mov\u00fdch s\u00faborov pri spusten\u00ed s pr\u00e1vami root. <\/p>\n

Nebezpe\u010denstvo zranite\u013enost\u00ed sa zhor\u0161uje t\u00fdm, \u017ee problematick\u00fd k\u00f3d sa pou\u017e\u00edva v bal\u00edkovom mana\u017e\u00e9ri npm pri oper\u00e1ci\u00e1ch s npm bal\u00ed\u010dkami, \u010do umo\u017e\u0148uje organizova\u0165 \u00fatok na pou\u017e\u00edvate\u013eov umiestnen\u00edm \u0161peci\u00e1lne upraven\u00e9ho npm bal\u00ed\u010dka do repozit\u00e1ra, pri spracovan\u00ed ktor\u00e9ho sa v syst\u00e9me vykon\u00e1 k\u00f3d \u00fato\u010dn\u00edka. \u00datok je mo\u017en\u00fd aj pri in\u0161tal\u00e1cii bal\u00ed\u010dkov v re\u017eime «—ignore-scripts», ktor\u00fd zakazuje vykon\u00e1vanie zabudovan\u00fdch skriptov. Celkovo npm sa t\u00fdka \u0161tyroch zranite\u013enost\u00ed (CVE-2021-32804, CVE-2021-37713, CVE-2021-39134 a CVE-2021-39135) zo siedmich. Prv\u00e9 dve probl\u00e9my sa t\u00fdkaj\u00fa bal\u00edka tar, zatia\u013e \u010do ostatn\u00e9 dva bal\u00edka @npmcli\/arborist. <\/p>\n

Najnebezpe\u010dnej\u0161ia zranite\u013enos\u0165 CVE-2021-32804 je sp\u00f4soben\u00e1 t\u00fdm, \u017ee pri \u010disten\u00ed uveden\u00fdch v arch\u00edve tar absol\u00fatnych ciest sa nespr\u00e1vne sprac\u00favaj\u00fa opakuj\u00face sa znaky « \/ » \u2013 odstr\u00e1ni sa len prv\u00fd znak a ostatn\u00e9 zostan\u00fa. Napr\u00edklad, cesta « \/home\/user\/.bashrc » bude transformovan\u00e1 na « home\/user\/.bashrc », zatia\u013e \u010do cesta « \/\/home\/user\/.bashrc » sa stane « \/home\/user\/.bashrc ». Druh\u00e1 zranite\u013enos\u0165 CVE-2021-37713 sa prejavuje len na platforme Windows a s\u00favis\u00ed s nespr\u00e1vnym \u010disten\u00edm relat\u00edvnych ciest, ktor\u00e9 obsahuj\u00fa nespr\u00e1vny znak disku (« C:someolder ») a sekvenciu na n\u00e1vrat do predch\u00e1dzaj\u00faceho adres\u00e1ra (« C:..\/foo »). <\/p>\n

Zranite\u013enosti CVE-2021-39134 a CVE-2021-39135 s\u00fa \u0161pecifick\u00e9 pre modul @npmcli\/arborist. Prv\u00fd probl\u00e9m sa prejavuje iba na syst\u00e9moch, ktor\u00e9 nerozli\u0161uj\u00fa ve\u013ekos\u0165 p\u00edsmen v s\u00faborov\u00fdch syst\u00e9moch (macOS a Windows), a umo\u017e\u0148uje zapisova\u0165 s\u00fabory do \u013eubovo\u013enej \u010dasti s\u00faborov\u00e9ho syst\u00e9mu, ak sa uved\u00fa medzi z\u00e1vislos\u0165ami dva moduly ‘foo»: «file:\/some\/path»‘ a ‘FOO: «file:foo.tgz»‘, ktor\u00fdch spracovanie povedie k odstr\u00e1neniu obsahu adres\u00e1ra \/some\/path a zap\u00edsaniu obsahu foo.tgz do neho. Druh\u00fd probl\u00e9m umo\u017e\u0148uje prepisovanie s\u00faborov prostredn\u00edctvom manipul\u00e1cie so symbolick\u00fdmi odkazmi. <\/p>\n

Zranite\u013enosti boli odstr\u00e1nen\u00e9 vo verzi\u00e1ch Node.js 12.22.6 a 14.17.6, npm CLI 6.14.15 a 7.21.0, ako aj v jednotliv\u00fdch verzi\u00e1ch bal\u00edka tar 4.4.19, 5.0.11 a 6.1.10. Po obdr\u017ean\u00ed inform\u00e1ci\u00ed o probl\u00e9me v r\u00e1mci iniciat\u00edvy «bug bounty» vyplatil GitHub v\u00fdskumn\u00edkom 14500 dol\u00e1rov a preh\u013eadal obsah repozit\u00e1ra, v ktorom neboli zisten\u00e9 pokusy o zneu\u017eitie zranite\u013enost\u00ed. Na ochranu pred uveden\u00fdmi probl\u00e9mami GitHub tie\u017e zaviedol z\u00e1kaz publikovania npm bal\u00ed\u010dkov v repozit\u00e1ri, ktor\u00e9 obsahuj\u00fa symbolick\u00e9 odkazy, tvrd\u00e9 odkazy a absol\u00fatne cesty.
\n
Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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