{"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\/hu\/blog\/news\/root-uyazvimost-v-instrumentarii-upravleniya-paketami-snap","title":{"rendered":"Root-sebezhet\u0151s\u00e9g a Snap csomagkezel\u0151 eszk\u00f6zeiben","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

A Qualys v\u00e1llalat id\u00e9n harmadik alkalommal fedezte fel a snap-confine seg\u00e9dprogramban egy vesz\u00e9lyes sebezhet\u0151s\u00e9get (CVE-2022-3328), amely root SUID jelz\u00e9ssel van ell\u00e1tva \u00e9s a snapd folyamat \u00e1ltal aktiv\u00e1lva van egy v\u00e9grehajthat\u00f3 k\u00f6rnyezet l\u00e9trehoz\u00e1s\u00e1hoz a snap form\u00e1tumban terjesztett \u00f6n\u00e1ll\u00f3 csomagok sz\u00e1m\u00e1ra. A sebezhet\u0151s\u00e9g lehet\u0151v\u00e9 teszi, hogy egy helyi, nem privilegiz\u00e1lt felhaszn\u00e1l\u00f3 root jogosults\u00e1g\u00fa k\u00f3dot futtasson az alap\u00e9rtelmezett Ubuntu konfigur\u00e1ci\u00f3ban. A probl\u00e9ma jav\u00edtva lett a snapd 2.57.6 kiad\u00e1s\u00e1ban. Csomagfriss\u00edt\u00e9sek \u00e9rkeztek minden t\u00e1mogatott Ubuntu \u00e1gra. <\/p>\n

\u00c9rdekes, hogy a megvitatott sebezhet\u0151s\u00e9g hasonl\u00f3, febru\u00e1ri sebezhet\u0151s\u00e9g jav\u00edt\u00e1sa sor\u00e1n j\u00f6tt l\u00e9tre a snap-confine-ban. A kutat\u00f3knak siker\u00fclt egy m\u0171k\u00f6d\u0151 exploittal k\u00e9sz\u00fclni\u00fck, amely root-hozz\u00e1f\u00e9r\u00e9st biztos\u00edt az Ubuntu Server 22.04 rendszerben, amelyben a snap-confine sebezhet\u0151s\u00e9ge mellett tov\u00e1bbi k\u00e9t sebezhet\u0151s\u00e9g is szerepel a multipathd folyamatban (CVE-2022-41974, CVE-2022-41973), amelyek a privilegiz\u00e1lt parancsok \u00e1tkonfigur\u00e1l\u00e1s\u00e1nak megker\u00fcl\u00e9s\u00e9vel \u00e9s a szimbolikus linkek nem biztons\u00e1gos kezel\u00e9s\u00e9vel kapcsolatosak. <\/p>\n

A snap-confine sebezhet\u0151s\u00e9ge egy versenyhelyzetb\u0151l ad\u00f3dik a must_mkdir_and_open_with_perms() funkci\u00f3ban, amelyet a \/tmp\/snap.$SNAP_NAME mappa szimbolikus linkk\u00e9 val\u00f3 cser\u00e9je ellen v\u00e9dend\u0151 adtak hozz\u00e1, miut\u00e1n ellen\u0151rizt\u00e9k a tulajdonost, de m\u00e9g a mount rendszerh\u00edv\u00e1s v\u00e9grehajt\u00e1sa el\u0151tt a snap form\u00e1tum\u00fa csomagok mapp\u00e1it bind-mont\u00e1l\u00e1sra. A hozz\u00e1adott v\u00e9delem abb\u00f3l \u00e1llt, hogy a \/tmp\/snap.$SNAP_NAME mapp\u00e1t m\u00e1sik, v\u00e9letlen n\u00e9vvel ell\u00e1tott mapp\u00e1ba nevezt\u00e9k \u00e1t, ha l\u00e9tezett \u00e9s nem a root felhaszn\u00e1l\u00f3\u00e9. <\/p>\n

A k\u00f6nyvt\u00e1r \u00e1tnevez\u00e9si m\u0171velete sor\u00e1n, m\u00edg a \/tmp\/snap.$SNAP_NAME haszn\u00e1latban volt, a kutat\u00f3k kihaszn\u00e1lt\u00e1k, hogy a snap-confine egy \/tmp\/snap.rootfs_XXXXXX k\u00f6nyvt\u00e1rat is l\u00e9trehoz a snap csomag tartalm\u00e1nak gy\u00f6ker\u00e9hez. A «XXXXXX» r\u00e9sz v\u00e9letlenszer\u0171en ker\u00fcl kiv\u00e1laszt\u00e1sra az mkdtemp() seg\u00edts\u00e9g\u00e9vel, de a «rootfs_XXXXXX» n\u00e9vvel rendelkez\u0151 csomag \u00e1t tudja menni a sc_instance_name_validate funkci\u00f3 ellen\u0151rz\u00e9s\u00e9n (azaz a l\u00e9nyeg az, hogy a $SNAP_NAME \u00e9rt\u00e9ket «rootfs_XXXXXX» -ra \u00e1ll\u00edtsuk, \u00e9s akkor az \u00e1tnevez\u00e9si m\u0171velet a \/tmp\/snap.rootfs_XXXXXX k\u00f6nyvt\u00e1r fel\u00fcl\u00edr\u00e1s\u00e1hoz vezet a snap gy\u00f6ker\u00e9vel). <\/p>\n

A k\u00e9t p\u00e9ld\u00e1ny\u00fa snap-confine ind\u00edt\u00e1s\u00e1val egyidej\u0171leg el\u00e9rhet\u0151 volt a \/tmp\/snap.rootfs_XXXXXX haszn\u00e1lata \u00e9s a \/tmp\/snap.$SNAP_NAME \u00e1tnevez\u00e9se. Amint az els\u0151 p\u00e9ld\u00e1ny l\u00e9trehozta a \/tmp\/snap.rootfs_XXXXXX-t, a folyamat blokkol\u00f3dott, \u00e9s elindult a m\u00e1sodik p\u00e9ld\u00e1ny rootfs_XXXXXX nev\u0171 csomaggal, amely miatt a m\u00e1sodik p\u00e9ld\u00e1ny ideiglenes k\u00f6nyvt\u00e1ra, a \/tmp\/snap.$SNAP_NAME, az els\u0151 p\u00e9ld\u00e1ny gy\u00f6k\u00e9r k\u00f6nyvt\u00e1r\u00e1v\u00e1 v\u00e1lt. Az \u00e1thelyez\u00e9s befejez\u00e9s\u00e9vel a m\u00e1sodik p\u00e9ld\u00e1ny \u00f6sszeomlott, \u00e9s a \/tmp\/snap.rootfs_XXXXXX helyettes\u00edtve lett egy versenyhelyzet manipul\u00e1ci\u00f3j\u00e1val, ahogyan azt a febru\u00e1ri sebezhet\u0151s\u00e9g kiakn\u00e1z\u00e1sakor tapasztalhattuk. Az els\u0151 p\u00e9ld\u00e1ny blokkol\u00e1s\u00e1nak felold\u00e1sa ut\u00e1n a t\u00e1mad\u00f3k teljes ellen\u0151rz\u00e9st nyertek a snap gy\u00f6k\u00e9r k\u00f6nyvt\u00e1ra felett. <\/p>\n

Az utols\u00f3 szakaszban l\u00e9trej\u00f6tt egy szimbolikus link a \/tmp\/snap.rootfs_XXXXXX\/tmp n\u00e9ven, amelyet a sc_bootstrap_mount_namespace() f\u00fcggv\u00e9ny haszn\u00e1lt a bind-mont\u00e1l\u00e1shoz, hogy a val\u00f3s, \u00edr\u00e1sra el\u00e9rhet\u0151 \/tmp k\u00f6nyvt\u00e1rat b\u00e1rmely f\u00e1jlrendszer k\u00f6nyvt\u00e1rba be tudja k\u00f6tni, mivel a mount() h\u00edv\u00e1sa a szimbolikus linkeket k\u00f6veti a mont\u00e1l\u00e1s el\u0151tt. Az ilyen mont\u00e1l\u00e1st az AppArmor korl\u00e1toz\u00e1sok blokkolj\u00e1k, de a blokkol\u00e1s megker\u00fcl\u00e9s\u00e9re az exploitban k\u00e9t seg\u00e9dsebezhet\u0151s\u00e9get alkalmaztak a multipathd-ben.
\n
Forr\u00e1s: 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\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-sebezhet\u0151s\u00e9g a Snap csomagkezel\u0151 eszk\u00f6zk\u00e9szlet\u00e9ben | ProHoster","description":"A Qualys felfedezte a harmadik vesz\u00e9lyes sebezhet\u0151s\u00e9get (CVE-2022-3328) ebben az \u00e9vben a snap-confine seg\u00e9dprogramban, amely SUID root z\u00e1szl\u00f3val van ell\u00e1tva \u00e9s a snapd folyamat h\u00edvja, hogy v\u00e9grehajthat\u00f3 k\u00f6rnyezetet hozzon l\u00e9tre.","canonical_url":"https:\/\/prohoster.info\/hu\/blog\/news\/root-uyazvimost-v-instrumentarii-upravleniya-paketami-snap","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"hu_HU","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 | ProHoster","og:description":"\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.","og:url":"https:\/\/prohoster.info\/hu\/blog\/news\/root-uyazvimost-v-instrumentarii-upravleniya-paketami-snap","og:image":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:secure_url":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:width":350,"og:image:height":350,"article:published_time":"2022-12-02T13:36:49+00:00","article:modified_time":"2022-12-02T13:36:49+00:00","article:publisher":"https:\/\/www.facebook.com\/prohoster","article:author":"https:\/\/www.facebook.com\/prohoster"},"aioseo_meta_data":[],"gt_translate_keys":[{"key":"link","format":"url"}],"_links":{"self":[{"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/posts\/105785","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/comments?post=105785"}],"version-history":[{"count":0,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/posts\/105785\/revisions"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/media?parent=105785"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/categories?post=105785"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/tags?post=105785"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}