{"id":93156,"date":"2020-09-03T19:42:00","date_gmt":"2020-09-03T17:42:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimosti-v-skanerah-bezopasnosti-obrazov-docker-kontejnerov"},"modified":"2020-09-03T19:42:00","modified_gmt":"2020-09-03T17:42:00","slug":"uyazvimosti-v-skanerah-bezopasnosti-obrazov-docker-kontejnerov","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/uyazvimosti-v-skanerah-bezopasnosti-obrazov-docker-kontejnerov","title":{"rendered":"Zranitelnosti ve skenerech zabezpe\u010den\u00ed obraz\u016f Docker kontejner\u016f","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Byly zve\u0159ejn\u011bny<\/a><\/noindex> v\u00fdsledky testov\u00e1n\u00ed n\u00e1stroj\u016f pro ur\u010dov\u00e1n\u00ed neopraven\u00fdch zranitelnost\u00ed a odhalov\u00e1n\u00ed bezpe\u010dnostn\u00edch probl\u00e9m\u016f v obrazech izolovan\u00fdch kontejner\u016f Docker. Kontrola uk\u00e1zala, \u017ee ve 4 z 6 zn\u00e1m\u00fdch skener\u016f obraz\u016f Docker byly nalezeny kritick\u00e9 zranitelnosti, kter\u00e9 umo\u017e\u0148ovaly napadnout p\u0159\u00edmo samotn\u00fd skener a dos\u00e1hnout vykon\u00e1n\u00ed vlastn\u00edho k\u00f3du v syst\u00e9mu, v n\u011bkter\u00fdch p\u0159\u00edpadech (nap\u0159\u00edklad p\u0159i pou\u017eit\u00ed Snyku) s pr\u00e1vy roota. <\/p>\n

Pro \u00fatok sta\u010d\u00ed, aby \u00fato\u010dn\u00edk inicioval kontrolu sv\u00e9ho Dockerfile nebo manifest.json, kter\u00fd obsahuje speci\u00e1ln\u011b form\u00e1tovan\u00e1 metadata, nebo um\u00edstil do obrazu soubory Podfile a gradlew. Prototypy exploit\u016f se poda\u0159ilo p\u0159ipravit<\/a><\/noindex> pro syst\u00e9my
\nWhiteSource<\/a><\/noindex>, Snyk<\/a><\/noindex>,
\nFossa<\/a><\/noindex> a
\nAnchore<\/a><\/noindex>. Nejlep\u0161\u00ed bezpe\u010dnost prok\u00e1zal bal\u00ed\u010dek Clair<\/a><\/noindex>, p\u016fvodn\u011b napsan\u00fd s ohledem na zaji\u0161t\u011bn\u00ed bezpe\u010dnosti. Probl\u00e9my tak\u00e9 nebyly zji\u0161t\u011bny v bal\u00ed\u010dku Trivy<\/a><\/noindex>. Nakonec bylo u\u010din\u011bno z\u00e1v\u011br, \u017ee skenery Docker kontejner\u016f by m\u011bly b\u00fdt spu\u0161t\u011bny v izolovan\u00fdch prost\u0159ed\u00edch nebo pou\u017e\u00edv\u00e1ny pouze pro kontrolu vlastn\u00edch obraz\u016f, a tak\u00e9 projevovat opatrnost p\u0159i p\u0159ipojov\u00e1n\u00ed takov\u00fdch n\u00e1stroj\u016f k automatizovan\u00fdm syst\u00e9m\u016fm nep\u0159etr\u017eit\u00e9 integrace.<\/p>\n

Ve FOSSA, Snyku a WhiteSource byla zranitelnost spojena s vol\u00e1n\u00edm extern\u00edho spr\u00e1vce bal\u00ed\u010dk\u016f pro ur\u010dov\u00e1n\u00ed z\u00e1vislost\u00ed a umo\u017enila organizovat vykon\u00e1n\u00ed vlastn\u00edho k\u00f3du prost\u0159ednictv\u00edm zad\u00e1n\u00ed p\u0159\u00edkaz\u016f touch a system v souborech gradlew<\/a><\/noindex> a Podfile<\/a><\/noindex>.<\/p>\n

V Snyku a WhiteSource byly d\u00e1le nalezeny<\/a><\/noindex> zranitelnosti<\/a><\/noindex>, spojen\u00e9<\/a><\/noindex> p\u0159i prov\u00e1d\u011bn\u00ed syst\u00e9mov\u00fdch p\u0159\u00edkaz\u016f p\u0159i anal\u00fdze Dockerfile (nap\u0159\u00edklad v Snyk prost\u0159ednictv\u00edm Dockefile bylo mo\u017en\u00e9 nahradit utilitu \/bin\/ls, kterou volal skener, a ve WhiteSource bylo mo\u017en\u00e9 vlo\u017eit k\u00f3d prost\u0159ednictv\u00edm argument\u016f ve form\u00e1tu «echo ‘;touch \/tmp\/hacked_whitesource_pip;=1.0′»). <\/p>\n

Ve skeneru Anchore byla zranitelnost zp\u016fsobena<\/a><\/noindex> pou\u017e\u00edv\u00e1n\u00edm utility skopeo<\/a><\/noindex> pro pr\u00e1ci s dockerov\u00fdmi obrazy. Pou\u017eit\u00ed spo\u010d\u00edvalo v p\u0159id\u00e1n\u00ed do souboru manifest.json parametr\u016f ve form\u00e1tu ‘»os»: «$(touch hacked_anchore)»‘, kter\u00e9 se pou\u017eij\u00ed p\u0159i vol\u00e1n\u00ed skopeo bez \u0159\u00e1dn\u00e9ho escapeov\u00e1n\u00ed (byly vy\u0159azeny pouze znaky «;&<>», ale konstrukce «$()» byla povolena).<\/p>\n

Tent\u00fd\u017e autor provedl v\u00fdzkum \u00fa\u010dinnosti odhalov\u00e1n\u00ed neopraven\u00fdch zranitelnost\u00ed skenery bezpe\u010dnosti docker kontejner\u016f a \u00farove\u0148 fale\u0161n\u00fdch poplach\u016f (\u010d\u00e1st 1<\/a><\/noindex>, \u010d\u00e1st 2<\/a><\/noindex>, \u010d\u00e1st 3<\/a><\/noindex>). N\u00ed\u017ee jsou uvedeny v\u00fdsledky testov\u00e1n\u00ed 73 obraz\u016f obsahuj\u00edc\u00edch zn\u00e1m\u00e9 zranitelnosti, a tak\u00e9 je hodnocena \u00fa\u010dinnost detekce typick\u00fdch aplikac\u00ed v obrazech (nginx, tomcat, haproxy, gunicorn, redis, ruby, node).<\/p>\n

\"Zranitelnosti<\/a><\/noindex><\/center><\/p>\n

\"Zranitelnosti<\/a><\/noindex><\/center><\/p>\n

<\/a><\/noindex><\/p>\n

Zdroj: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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\u043e\u0442\u0434\u0435\u043b\u044c\u043d\u044b\u0445 \u0441\u043b\u0443\u0447\u0430\u044f\u0445 (\u043d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, \u043f\u0440\u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0438 Snyk) \u0441 \u043f\u0440\u0430\u0432\u0430\u043c\u0438 root. \u0414\u043b\u044f […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":93157,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-93156","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\udd47Zranitelnosti ve skenerech bezpe\u010dnosti obraz\u016f Docker 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