{"id":105785,"date":"2022-12-02T15:36:49","date_gmt":"2022-12-02T13:36:49","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/root-uyazvimost-v-instrumentarii-upravleniya-paketami-snap"},"modified":"2022-12-02T15:36:49","modified_gmt":"2022-12-02T13:36:49","slug":"root-uyazvimost-v-instrumentarii-upravleniya-paketami-snap","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/news\/root-uyazvimost-v-instrumentarii-upravleniya-paketami-snap","title":{"rendered":"Root-haavatavus Snap pakihaldustarkvaras","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Qualys avastas selle aasta kolmanda t\u00f5sise haavatavuse (CVE-2022-3328) utiliidis snap-confine, mis on varustatud SUID root lipuga ja mida k\u00e4itab protsess snapd, et luua t\u00e4itmiskeskkond snap-formaadis iseseisvaid rakendusi sisaldavatele pakettidele. Haavatavus v\u00f5imaldab kohalikel, mitte-privileegitud kasutajatel saada root\u2019i \u00f5igusi Ubuntu vaikeseades. Probleem on lahendatud versioonis snapd 2.57.6. Pakettide uuendused on v\u00e4lja antud k\u00f5igi toetatud Ubuntu harude jaoks. <\/p>\n

On huvitav, et arutatav haavatavus lisati sarnase veebruari haavatavuse parandamise protsessi k\u00e4igus snap-confine'is. Uurijatel \u00f5nnestus valmistada t\u00f6\u00f6v\u00f5ime, mis annab root-juurdep\u00e4\u00e4su Ubuntu Server 22.04-le, mille puhul on lisaks snap-confine'i haavatavusele seotud ka kaks haavatavust multipathd protsessis (CVE-2022-41974, CVE-2022-41973), mis on seotud privileege kontrollivate k\u00e4skude edastamise ja s\u00fcmboolsete linkidega ebaturvalise t\u00f6\u00f6tlemisega. <\/p>\n

Snap-confine'i haavatavus tuleneb v\u00f5istlusolukorrast funktsioonis must_mkdir_and_open_with_perms(), mis lisati katalooge \/tmp\/snap.$SNAP_NAME, et kaitsta kaustade asendamise eest s\u00fcmboolsetele linkidele omaniku kontrollimise j\u00e4rel, kuid enne mount-s\u00fcsteemik\u00f5ne sooritamist bind-monteerimiseks katsetas. Lisatud kaitse seisnes katalooge \/tmp\/snap.$SNAP_NAME nimelise randomiseerimise muutmises teise katalooge all \/tmp, kui see eksisteerib ja ei kuulu kasutajale root. <\/p>\n

Katalooge \u00fcmbernimetamise operatsiooni \u00f5iguslikuks kasutamiseks kasutasid teadlased seda, et snap-confine loob ka katalooge \/tmp\/snap.rootfs_XXXXXX paketi sisu juures. Aasta osa «XXXXXX» nimes valitakse juhuslikult kasutades mkdtemp(), kuid paketil nimega «rootfs_XXXXXX» v\u00f5ib l\u00e4bida kontrolli funktsioonis sc_instance_name_validate (st idee on see, et nimi $SNAP_NAME omaks v\u00e4\u00e4rtust «rootfs_XXXXXX» ja seega \u00fcmbernimetamise operatsioon viib katalooge \/tmp\/snap.rootfs_XXXXXX snapi juurega kirjutamiseni). <\/p>\n

Selleks, et saavutada samaaegset kasutamist \/tmp\/snap.rootfs_XXXXXX ja katalooge \/tmp\/snap.$SNAP_NAME muutmist, k\u00e4ivitati kaks snap-confine'i eksemplari. Kui esimene eksemplar loob katalooge \/tmp\/snap.rootfs_XXXXXX, lukustub protsess ja k\u00e4ivitatakse teine eksemplar nimega rootfs_XXXXXX, mis viib oma ajutise kausta \/tmp\/snap.$SNAP_NAME muutmise\u5230 \/tmp\/snap.rootfs_XXXXXX. P\u00e4rast rename toimingut l\u00f5petas teine eksemplar ootamatult, ja \/tmp\/snap.rootfs_XXXXXX asendati v\u00f5istlusolukorra manipuleerimisega, nagu veebruari haavatavuse \u00e4rakasutamise korral. P\u00e4rast asendust eemaldati esimese eksemplari heldus ja r\u00fcndajad said t\u00e4ieliku kontrolli snap-juure katalooge. <\/p>\n

Viimases etapis loodi s\u00fcmboolne link \/tmp\/snap.rootfs_XXXXXX\/tmp, mida kasutati funktsioonis sc_bootstrap_mount_namespace() bind-monteerimiseks kirjutatavas f\u00fc\u00fcsilises kataloogis \/tmp, mis iga katalooge FS-s, kuna mount() t\u00f5uke tulevaste s\u00fcmboolsete linkide s\u00f5numit enne monteerimist. Selline monteerimine on AppArmori piirangutega blokeeritud, kuid need blokid \u00fcletamiseks h\u00f5lmas utiliidis kahte abikwaidad multipathd.
\n
Allikas: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u041a\u043e\u043c\u043f\u0430\u043d\u0438\u044f Qualys \u0432\u044b\u044f\u0432\u0438\u043b\u0430 \u0442\u0440\u0435\u0442\u044c\u044e \u0432 \u044d\u0442\u043e\u043c\u0443 \u0433\u043e\u0434\u0443 \u043e\u043f\u0430\u0441\u043d\u0443\u044e \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2022-3328) \u0432 \u0443\u0442\u0438\u043b\u0438\u0442\u0435 snap-confine, \u043f\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u043c\u043e\u0439 \u0441 \u0444\u043b\u0430\u0433\u043e\u043c SUID root \u0438 \u0432\u044b\u0437\u044b\u0432\u0430\u0435\u043c\u043e\u0439 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u043c snapd \u0434\u043b\u044f \u0444\u043e\u0440\u043c\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u0438\u0441\u043f\u043e\u043b\u043d\u044f\u0435\u043c\u043e\u0433\u043e \u043e\u043a\u0440\u0443\u0436\u0435\u043d\u0438\u044f \u0434\u043b\u044f \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u0439, \u0440\u0430\u0441\u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u044f\u0435\u043c\u044b\u0445 \u0432 \u0441\u0430\u043c\u043e\u0434\u043e\u0441\u0442\u0430\u0442\u043e\u0447\u043d\u044b\u0445 \u043f\u0430\u043a\u0435\u0442\u0430\u0445 \u0432 \u0444\u043e\u0440\u043c\u0430\u0442\u0435 snap. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u043e\u043c\u0443 \u043d\u0435\u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u043c\u0443 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044e \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u043a\u043e\u0434\u0430 \u0441 \u043f\u0440\u0430\u0432\u0430\u043c\u0438 root \u0432 \u043a\u043e\u043d\u0444\u0438\u0433\u0443\u0440\u0430\u0446\u0438\u0438 Ubuntu \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u0432 \u0432\u044b\u043f\u0443\u0441\u043a\u0435 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-105785","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\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\n","aioseo_head_json":{"title":"\ud83e\udd47Root-haavatavus Snap-pakettide haldust\u00f6\u00f6riistas | ProHoster","description":"Ettev\u00f5te Qualys tuvastas selle aasta kolmanda ohtliku haavatavuse (CVE-2022-3328) utiliidis snap-confine, mis on tarnitud SUID root lipuga ja mida k\u00e4itab protsess snapd, et luua t\u00e4idesaatva keskkonda.","canonical_url":"https:\/\/prohoster.info\/et\/blog\/news\/root-uyazvimost-v-instrumentarii-upravleniya-paketami-snap","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"et_EE","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47Root-\u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432 \u0438\u043d\u0441\u0442\u0440\u0443\u043c\u0435\u043d\u0442\u0430\u0440\u0438\u0438 \u0443\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u044f \u043f\u0430\u043a\u0435\u0442\u0430\u043c\u0438 Snap | 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