{"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\/da\/blog\/news\/uyazvimosti-v-skanerah-bezopasnosti-obrazov-docker-kontejnerov","title":{"rendered":"S\u00e5rbarheder i sikkerhedsscannere til Docker-containere","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Publiceret<\/a><\/noindex> resultaterne af testningen af v\u00e6rkt\u00f8jerne til at identificere uopdagede s\u00e5rbarheder og afsl\u00f8re sikkerhedsproblemer i Docker-isolerede containerbilleder. Unders\u00f8gelsen viste, at 4 ud af 6 kendte Docker-billedscanner havde kritiske s\u00e5rbarheder, der muligg\u00f8r direkte angreb p\u00e5 selve scanneren og udf\u00f8relse af egen kode i systemet, i visse tilf\u00e6lde (f.eks. ved brug af Snyk) med root-rettigheder. <\/p>\n

For at gennemf\u00f8re et angreb er det tilstr\u00e6kkeligt for angriberen at initiere en kontrol af sin Dockerfile eller manifest.json, der inkluderer specifikt udformede metadata, eller at placere Podfile- og gradlew-filer indeni billedet. Prototype exploits blev forberedt<\/a><\/noindex> for systemer
\nWhiteSource<\/a><\/noindex>, Snyk<\/a><\/noindex>,
\nFossa<\/a><\/noindex> og
\nAnchore<\/a><\/noindex>. Den bedste sikkerhed blev vist af pakken Clair<\/a><\/noindex>, som oprindeligt blev skrevet med fokus p\u00e5 sikkerhed. Der blev heller ikke identificeret problemer i pakken Trivy<\/a><\/noindex>. I sidste ende konkluderes det, at Docker-container scannere b\u00f8r k\u00f8re i isolerede milj\u00f8er eller kun bruges til at kontrollere egne billeder, og der skal udvises forsigtighed ved tilslutning af s\u00e5danne v\u00e6rkt\u00f8jer til automatiserede systemer til kontinuerlig integration.<\/p>\n

I FOSSA, Snyk og WhiteSource var s\u00e5rbarheden relateret til kald af en ekstern pakkeh\u00e5ndterer til at bestemme afh\u00e6ngigheder og gjorde det muligt at udf\u00f8re sin egen kode ved at angive kommandoer som touch og system i filerne gradlew<\/a><\/noindex> og Podfile<\/a><\/noindex>.<\/p>\n

I Snyk og WhiteSource blev der desuden fundet<\/a><\/noindex> s\u00e5rbarheder<\/a><\/noindex>, der relaterer<\/a><\/noindex> med organisationen af systemkommandok\u00f8rsler ved analyse af Dockerfile (for eksempel i Snyk kunne man erstatte v\u00e6rkt\u00f8jet \/bin\/ls, som blev kaldt af scanner, og i WhiteSource kunne man inds\u00e6tte kode gennem argumenter i formen 'echo ';touch \/tmp\/hacked_whitesource_pip;=1.0). <\/p>\n

I Anchore var s\u00e5rbarheden for\u00e5rsaget af<\/a><\/noindex> brugen af v\u00e6rkt\u00f8jet skopeo<\/a><\/noindex> til arbejde med docker-billeder. Udnyttelse bestod af at tilf\u00f8je parametre af typen '\"os\": \"$(touch hacked_anchore)\"' i manifest.json-filen, som inds\u00e6ttes ved kald af skopeo uden ordentlig escaping (kun tegnene ';&', blev fjernet, men konstruktionen '$(...)' blev tilladt).<\/p>\n

Den samme forfatter har gennemf\u00f8rt en unders\u00f8gelse af effektiviteten af at opdage uopdagede s\u00e5rbarheder ved hj\u00e6lp af sikkerhedsscannere til docker-containere og niveauet for falske positiver (del 1<\/a><\/noindex>, del 2<\/a><\/noindex>, del 3<\/a><\/noindex>). Nedenfor vises resultaterne fra testen af 73 billeder, der indeholder kendte s\u00e5rbarheder, samt en vurdering af effektiviteten af at identificere de almindelige applikationer i billederne (nginx, tomcat, haproxy, gunicorn, redis, ruby, node).<\/p>\n

\"S\u00e5rbarheder<\/a><\/noindex><\/center><\/p>\n

\"S\u00e5rbarheder<\/a><\/noindex><\/center><\/p>\n

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

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

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