{"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\/sk\/blog\/news\/uyazvimosti-v-skanerah-bezopasnosti-obrazov-docker-kontejnerov","title":{"rendered":"Zranite\u013enosti v skeneroch bezpe\u010dnosti Docker kontajnerov","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Boli zverejnen\u00e9<\/a><\/noindex> v\u00fdsledky testovania n\u00e1strojov na identifik\u00e1ciu neopravite\u013en\u00fdch zranite\u013enost\u00ed a odha\u013eovanie bezpe\u010dnostn\u00fdch probl\u00e9mov v obraz\u00edch izolovan\u00fdch kontajnerov Docker. Kontrola uk\u00e1zala, \u017ee 4 z 6 zn\u00e1mych skenerov obrazov Docker mali kritick\u00e9 zranite\u013enosti, ktor\u00e9 umo\u017e\u0148ovali priamy \u00fatok na samotn\u00fd skener a spustenie vlastn\u00e9ho k\u00f3du v syst\u00e9me, v niektor\u00fdch pr\u00edpadoch (napr\u00edklad pri pou\u017eit\u00ed Snyk) s pr\u00e1vami root. <\/p>\n

Na \u00fatok sta\u010d\u00ed, aby \u00fato\u010dn\u00edk inicioval kontrolu svojho Dockerfile alebo manifest.json, ktor\u00fd obsahuje \u0161peci\u00e1lne formulovan\u00e9 metad\u00e1ta, alebo umiestnil do obrazu s\u00fabory Podfile a gradlew. Prototypy exploitov sa podarilo pripravi\u0165<\/a><\/noindex> pre syst\u00e9my
\nWhiteSource<\/a><\/noindex>, Snyk<\/a><\/noindex>,
\nFossa<\/a><\/noindex> a
\nAnchore<\/a><\/noindex>. Najlep\u0161iu bezpe\u010dnos\u0165 preuk\u00e1zal bal\u00edk Clair<\/a><\/noindex>, p\u00f4vodne nap\u00edsan\u00fd s oh\u013eadom na zabezpe\u010denie. Probl\u00e9my neboli zisten\u00e9 ani v bal\u00edku Trivy<\/a><\/noindex>. V kone\u010dnom d\u00f4sledku sa dospelo k z\u00e1veru, \u017ee skenery Docker kontajnerov by sa mali sp\u00fa\u0161\u0165a\u0165 v izolovan\u00fdch prostrediach alebo pou\u017e\u00edva\u0165 iba na kontrolu vlastn\u00fdch obrazov, a tie\u017e by\u0165 opatrn\u00fd pri pripojen\u00ed podobn\u00fdch n\u00e1strojov k automatizovan\u00fdm syst\u00e9mom kontinu\u00e1lnej integr\u00e1cie.<\/p>\n

Vo FOSSA, Snyk a WhiteSource bola zranite\u013enos\u0165 spojen\u00e1 s volan\u00edm extern\u00e9ho spr\u00e1vcu bal\u00edkov na ur\u010denie z\u00e1vislost\u00ed a umo\u017e\u0148ovala organizova\u0165 vykonanie vlastn\u00e9ho k\u00f3du prostredn\u00edctvom zadan\u00ed pr\u00edkazov touch a system v s\u00faboroch gradlew<\/a><\/noindex> a Podfile<\/a><\/noindex>.<\/p>\n

V Snyk a WhiteSource navy\u0161e boli n\u00e1jden\u00e9<\/a><\/noindex> zranite\u013enosti<\/a><\/noindex>, s organiz\u00e1ciou sp\u00fa\u0161\u0165ania syst\u00e9mov\u00fdch pr\u00edkazov pri anal\u00fdze Dockerfile (napr\u00edklad v Snyk sa mohla prostredn\u00edctvom Dockerfile nahradi\u0165 utilita \/bin\/ls, ktor\u00e1 bola volan\u00e1 skenerom, a v WhiteSource sa mohol vlo\u017ei\u0165 k\u00f3d pomocou argumentov vo forme \u201eecho \u2018;touch \/tmp\/hacked_whitesource_pip;=1.0\u2032\u201c).<\/a><\/noindex> s organizovan\u00edm sp\u00fa\u0161\u0165ania syst\u00e9mov\u00fdch pr\u00edkazov pri anal\u00fdze Dockerfile (napr\u00edklad v Snyku mohlo by\u0165 prostredn\u00edctvom Dockefile nahraden\u00e9 n\u00e1strojom \/bin\/ls, volan\u00fdm skenerom, a vo WhiteSource bolo mo\u017en\u00e9 zada\u0165 k\u00f3d prostredn\u00edctvom argumentov vo forme \u201eecho \u2018;touch \/tmp\/hacked_whitesource_pip;=1.0\u2019). <\/p>\n

vyvolan\u00e1 pou\u017e\u00edvan\u00edm utilit<\/a><\/noindex> skopeo na pr\u00e1cu s docker obrazmi. Explot\u00e1cia sa s\u00fastre\u010fovala na prid\u00e1vanie parametrov typu \u201a\u201dos\u201d: \u201e$(touch hacked_anchore)\u201d\u2018 do s\u00faboru manifest.json, ktor\u00e9 s\u00fa vlo\u017een\u00e9 pri volan\u00ed skopeo bez riadneho escaping (odstra\u0148ovali sa len znaky \u201e;&\u201c, ale kon\u0161trukcia \u201e$()\u201c bola povolen\u00e1).<\/a><\/noindex> na pr\u00e1cu s docker-obrazmi. Prev\u00e1dzka spo\u010d\u00edvala v prid\u00e1van\u00ed do s\u00faboru manifest.json parametrov typu \u201eos\u201c: \u201e$(touch hacked_anchore)\u201c, ktor\u00e9 sa vkladaj\u00fa pri volan\u00ed skopeo bez riadneho escapovania (vystrihli sa iba znaky \u201e; &\u201c, ale povolila sa kon\u0161trukcia \u201e$()\u201c).<\/p>\n

\u010das\u0165 3\u010das\u0165 1<\/a><\/noindex>, \u010das\u0165 2<\/a><\/noindex>, \u010das\u0165 3<\/a><\/noindex>). Ni\u017e\u0161ie s\u00fa uveden\u00e9 v\u00fdsledky testovania 73 obrazov, ktor\u00e9 obsahuj\u00fa zn\u00e1me zranite\u013enosti, ako aj hodnotenie efektivity detekcie pr\u00edtomnosti typick\u00fdch aplik\u00e1ci\u00ed v obrazov (nginx, tomcat, haproxy, gunicorn, redis, ruby, node).<\/p>\n

\"Zranite\u013enosti<\/a><\/noindex><\/center><\/p>\n

\"Zranite\u013enosti<\/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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