{"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\/cs\/blog\/news\/uyazvimost-v-npm-privodyashhaya-k-perezapisi-fajlov-v-sisteme","title":{"rendered":"Zranitelnost v NPM vedouc\u00ed k p\u0159eps\u00e1n\u00ed soubor\u016f v syst\u00e9mu","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Spole\u010dnost GitHub zve\u0159ejnila podrobnosti o sedmi zranitelnostech v bal\u00ed\u010dc\u00edch tar a @npmcli\/arborist, kter\u00e9 poskytuj\u00ed funkce pro pr\u00e1ci s tar archivy a v\u00fdpo\u010det stromu z\u00e1vislost\u00ed v Node.js. Zranitelnosti umo\u017e\u0148uj\u00ed p\u0159i rozbalov\u00e1n\u00ed speci\u00e1ln\u011b p\u0159ipraven\u00e9ho archivu p\u0159epsat soubory mimo ko\u0159enov\u00fd adres\u00e1\u0159, do kter\u00e9ho se rozbaluj\u00ed, v z\u00e1vislosti na aktu\u00e1ln\u00edch p\u0159\u00edstupov\u00fdch pr\u00e1vech. Tyto probl\u00e9my umo\u017e\u0148uj\u00ed prov\u00e9st libovoln\u00fd k\u00f3d v syst\u00e9mu, nap\u0159\u00edklad p\u0159id\u00e1n\u00edm p\u0159\u00edkaz\u016f do ~\/.bashrc nebo ~\/.profile p\u0159i prov\u00e1d\u011bn\u00ed operace neprivilegovan\u00fdm u\u017eivatelem nebo nahrazen\u00edm syst\u00e9mov\u00fdch soubor\u016f p\u0159i spu\u0161t\u011bn\u00ed s pr\u00e1vy root. <\/p>\n

Nebezpe\u010d\u00ed zranitelnost\u00ed se zhor\u0161uje t\u00edm, \u017ee probl\u00e9mov\u00fd k\u00f3d je pou\u017eit v bal\u00ed\u010dkov\u00e9m spr\u00e1vci npm p\u0159i operac\u00edch s npm bal\u00ed\u010dky, co\u017e umo\u017e\u0148uje uspo\u0159\u00e1dat \u00fatok na u\u017eivatele, kdy\u017e se do repozit\u00e1\u0159e um\u00edst\u00ed speci\u00e1ln\u011b upraven\u00fd npm bal\u00ed\u010dek, jeho\u017e zpracov\u00e1n\u00edm bude v syst\u00e9mu proveden k\u00f3d \u00fato\u010dn\u00edka. \u00datok je mo\u017en\u00fd i p\u0159i instalaci bal\u00ed\u010dk\u016f v re\u017eimu «—ignore-scripts», kter\u00fd vyp\u00edn\u00e1 prov\u00e1d\u011bn\u00ed integrovan\u00fdch skript\u016f. Celkem npm zasahuje do \u010dty\u0159 zranitelnost\u00ed (CVE-2021-32804, CVE-2021-37713, CVE-2021-39134 a CVE-2021-39135) ze sedmi. Prvn\u00ed dv\u011b probl\u00e9my se t\u00fdkaj\u00ed bal\u00ed\u010dku tar, zat\u00edmco dal\u0161\u00ed dv\u011b bal\u00ed\u010dku @npmcli\/arborist. <\/p>\n

Nejv\u011bt\u0161\u00ed nebezpe\u010d\u00ed p\u0159edstavuje zranitelnost CVE-2021-32804, kter\u00e1 vznik\u00e1 t\u00edm, \u017ee p\u0159i \u010di\u0161t\u011bn\u00ed ur\u010den\u00fdch v archivu tar absolutn\u00edch cest jsou nespr\u00e1vn\u011b zpracov\u00e1ny opakuj\u00edc\u00ed se znaky « \/ » \u2014 odstran\u00ed se pouze prvn\u00ed znak, zat\u00edmco ostatn\u00ed z\u016fstanou. Nap\u0159\u00edklad cesta « \/home\/user\/.bashrc » se p\u0159evede na « home\/user\/.bashrc », zat\u00edmco cesta « \/\/home\/user\/.bashrc » na « \/home\/user\/.bashrc ». Druh\u00e1 zranitelnost CVE-2021-37713 se projevuje pouze na platform\u011b Windows a souvis\u00ed s nespr\u00e1vn\u00fdm \u010di\u0161t\u011bn\u00edm relativn\u00edch cest, kter\u00e9 zahrnuj\u00ed ned\u011blen\u00fd znak disku (« C:some\notebook ») a sekvenci pro n\u00e1vrat do p\u0159edchoz\u00edho adres\u00e1\u0159e (« C:..\/foo »). <\/p>\n

Zranitelnosti CVE-2021-39134 a CVE-2021-39135 jsou specifick\u00e9 pro modul @npmcli\/arborist. Prvn\u00ed probl\u00e9m se projevuje pouze na syst\u00e9mech, kter\u00e9 nerozli\u0161uj\u00ed velk\u00e1 a mal\u00e1 p\u00edsmena ve FS (macOS a Windows), a umo\u017e\u0148uje zapisovat soubory do libovoln\u00e9 \u010d\u00e1sti FS t\u00edm, \u017ee v z\u00e1vislostech uvedete dva moduly ‘»foo»: «file:\/some\/path»‘ a ‘FOO: «file:foo.tgz»‘, jejich\u017e zpracov\u00e1n\u00ed povede k odstran\u011bn\u00ed obsahu adres\u00e1\u0159e \/some\/path a z\u00e1pisu obsahu foo.tgz do n\u011bj. Druh\u00fd probl\u00e9m umo\u017e\u0148uje p\u0159epsat soubory manipulac\u00ed se symbolick\u00fdmi odkazy. <\/p>\n

Zranitelnosti byly odstran\u011bny ve vyd\u00e1n\u00edch Node.js 12.22.6 a 14.17.6, npm CLI 6.14.15 a 7.21.0, a tak\u00e9 v jednotliv\u00fdch vyd\u00e1n\u00edch bal\u00ed\u010dku tar 4.4.19, 5.0.11 a 6.1.10. Pot\u00e9, co se o probl\u00e9mu dozv\u011bd\u011bl v r\u00e1mci iniciativy «bug bounty», GitHub vyplatil v\u00fdzkumn\u00edk\u016fm 14500 $ a prozkoumal obsah repozit\u00e1\u0159e, ve kter\u00e9m nebyly odhaleny pokusy o zneu\u017eit\u00ed zranitelnost\u00ed. K ochran\u011b p\u0159ed uveden\u00fdmi probl\u00e9my GitHub tak\u00e9 zavedl z\u00e1kaz publikov\u00e1n\u00ed v repozit\u00e1\u0159\u00edch NPM bal\u00ed\u010dk\u016f obsahuj\u00edc\u00edch symbolick\u00e9 odkazy, tvrd\u00e9 odkazy a absolutn\u00ed cesty.
\n
Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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